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<head>
<meta charset=utf-8>
<meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no">
<meta name=generator content="Hugo 0.92.2">
<meta name=generator content="Hugo 0.93.0">
<meta name=robots content="index, follow">
<link rel="shortcut icon" href=/favicons/favicon.ico>
<link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180>
@ -14,8 +14,7 @@
<link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96>
<link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144>
<link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192>
<title>Nav Upgrade | alguidelines.dev - Business Central Design Patterns</title>
<meta name=description content="Anti-Patterns in NAV Upgrade
<title>Nav Upgrade | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Anti-Patterns in NAV Upgrade
By Carlos Raul Garcia and Bogdana Botez at Microsoft Development Center Copenhagen
Context: when NAV is upgraded, …">
@ -48,8 +47,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<link href=/scss/main.min.84a617ff0c0265eb62b5cd2929c572f4ed37dc4907d0cf068be4eb2974f6d60f.css rel=stylesheet integrity>
<script src=https://code.jquery.com/jquery-3.6.0.min.js integrity=sha384-vtXRMe3mGCbOeY7l30aIg8H9p3GdeSe4IFlP6G8JMa7o7lXvnz3GFKzPxzJdPfGK crossorigin=anonymous></script>
<script src=https://unpkg.com/lunr@2.3.9/lunr.min.js integrity=sha384-203J0SNzyqHby3iU6hzvzltrWi/M41wOP5Gu+BiJMz5nwKykbkUx8Kp7iti0Lpli crossorigin=anonymous></script>
</head>
<body class=td-page>
</head><body class=td-page>
<header>
<nav class="js-navbar-scroll navbar navbar-expand navbar-dark flex-column flex-md-row td-navbar">
<a class=navbar-brand href=/>
@ -61,36 +59,24 @@ If the table is empty, it means that either the upgrade has run, or there was no
<ul class="navbar-nav mt-2 mt-lg-0">
<li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=/docs/><i class="fas fa-book"></i><span>Docs</span></a>
</li>
<li class="nav-item mr-4 mb-2 mb-lg-0">
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=https://github.com/microsoft/alguidelines/discussions/ target=_blank><i class="fas fa-comments"></i><span>Discussions</span></a>
</li>
<li class="nav-item mr-4 mb-2 mb-lg-0">
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=https://github.com/microsoft/alguidelines target=_blank><i class="fab fa-github"></i><span>GitHub</span></a>
</li>
<li class="nav-item mr-4 mb-2 mb-lg-0">
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=https://discord.gg/4wbfNv3 target=_blank><i class="fab fa-discord"></i><span>Discord</span></a>
</li>
</ul>
</div>
<div class="navbar-nav d-none d-lg-block"><input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.9ab69a84696ad11cb17318558d9706e3.json data-offline-search-base-href=/ data-offline-search-max-results=10>
</div>
</nav>
</header>
<div class="container-fluid td-outer">
</li></ul></div><div class="navbar-nav d-none d-lg-block"><input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.c6558a635de208ea1007e79e444e323a.json data-offline-search-base-href=/ data-offline-search-max-results=10>
</div></nav></header><div class="container-fluid td-outer">
<div class=td-main>
<div class="row flex-xl-nowrap">
<aside class="col-12 col-md-3 col-xl-2 td-sidebar d-print-none">
<div id=td-sidebar-menu class=td-sidebar__inner>
<div id=content-mobile>
<form class="td-sidebar__search d-flex align-items-center">
<input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.9ab69a84696ad11cb17318558d9706e3.json data-offline-search-base-href=/ data-offline-search-max-results=10>
<input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.c6558a635de208ea1007e79e444e323a.json data-offline-search-base-href=/ data-offline-search-max-results=10>
<button class="btn btn-link td-sidebar__toggle d-md-none p-0 ml-3 fas fa-bars" type=button data-toggle=collapse data-target=#td-section-nav aria-controls=td-docs-nav aria-expanded=false aria-label="Toggle section navigation">
</button>
</form>
</div>
<div id=content-desktop></div>
<nav class="collapse td-sidebar-nav" id=td-section-nav>
</form></div><div id=content-desktop></div><nav class="collapse td-sidebar-nav" id=td-section-nav>
<ul class="td-sidebar-nav__section pr-md-3 ul-0">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docs-li>
<a href=/docs/ title="AL Guidelines" class="align-left pl-0 td-sidebar-link td-sidebar-link__section tree-root" id=m-docs><span>Docs</span></a>
@ -108,9 +94,9 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/patterns/facade-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsfacade-pattern><span>Façade</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsgeneric-method-pattern-li>
<a href=/docs/patterns/generic-method-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsgeneric-method-pattern><span>Generic Method</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsno-series-li>
<a href=/docs/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsno-series><span>No. Series</span></a>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
<a href=/docs/bestpractices/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsbestpractices><span>Best Practices</span></a>
<ul class="ul-2 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesapi-page-li>
@ -157,9 +143,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/bestpractices/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariable-naming><span>Variable Naming</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesvariables-declarations-order-li>
<a href=/docs/bestpractices/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariables-declarations-order><span>Variables Declarations Order</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
<a href=/docs/navpatterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns><span>NAV Patterns Archive</span></a>
<ul class="ul-2 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatterns-li>
@ -174,9 +158,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity-li>
<a href=/docs/navpatterns/patterns/blocked-entity/data-driven-blocked-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity><span>Data Driven Blocked Entity</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternscached-web-service-calls-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternscached-web-service-calls-li>
<a href=/docs/navpatterns/patterns/cached-web-service-calls/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscached-web-service-calls><span>Cached Web Server Calls</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsconditional-cascading-update-li>
<a href=/docs/navpatterns/patterns/conditional-cascading-update/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsconditional-cascading-update><span>Conditional Cascading Update</span></a>
@ -231,9 +213,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal-li>
<a href=/docs/navpatterns/patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal><span>TryFunction NET Exception Handling in CAL</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsno-series-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsno-series-li>
<a href=/docs/navpatterns/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsno-series><span>No Series</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatternspatternsnotifications-li>
<a href=/docs/navpatterns/patterns/notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsnotifications><span>Notifications</span></a>
@ -242,9 +222,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/patterns/notifications/in-context-notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsin-context-notifications><span>In-context Notifications</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern-li>
<a href=/docs/navpatterns/patterns/notifications/notification-lifecycle-management-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern><span>Notification Lifecycle Management Pattern</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsobserver-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsobserver-li>
<a href=/docs/navpatterns/patterns/observer/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsobserver><span>Observer</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsposting-routine-select-behavior-li>
<a href=/docs/navpatterns/patterns/posting-routine-select-behavior/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsposting-routine-select-behavior><span>Posting Routine - Select Behavior</span></a>
@ -259,9 +237,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/patterns/queries/use-queries-to-detect-duplicate-records/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-detect-duplicate-records><span>Use Queries to Detect Duplicate Records</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops-li>
<a href=/docs/navpatterns/patterns/queries/use-queries-to-replace-nested-loops/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops><span>Use Queries to Replace Nested Loops</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
<a href=/docs/navpatterns/patterns/read-once-initialization-and-validation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsread-once-initialization-and-validation><span>Read-once Initialization and Validation</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsreleased-entity-li>
<a href=/docs/navpatterns/patterns/released-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsreleased-entity><span>Released Entity</span></a>
@ -280,9 +256,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/patterns/security/4-masked-text/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity4-masked-text><span>Masked Text</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity5-ssl-in-nav-li>
<a href=/docs/navpatterns/patterns/security/5-ssl-in-nav/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity5-ssl-in-nav><span>SSL in NAV</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
<a href=/docs/navpatterns/patterns/setup-specificity-fallback/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssetup-specificity-fallback><span>Setup Specificity Fallback</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssilent-file-upload-and-download-li>
<a href=/docs/navpatterns/patterns/silent-file-upload-and-download/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssilent-file-upload-and-download><span>Silent File Upload and Download</span></a>
@ -298,11 +272,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/patterns/singleton/singleton-table/cue-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablecue-table><span>Cue Table</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table-li>
<a href=/docs/navpatterns/patterns/singleton/singleton-table/setup-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table><span>Setup Table</span></a>
</li>
</ul>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsstandard-journal-li>
</li></ul></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsstandard-journal-li>
<a href=/docs/navpatterns/patterns/standard-journal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsstandard-journal><span>Standard Journal</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternstemporary-dataset-report-li>
<a href=/docs/navpatterns/patterns/temporary-dataset-report/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstemporary-dataset-report><span>Temporary Dataset Report</span></a>
@ -312,18 +282,14 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/patterns/transfer-custom-fields/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstransfer-custom-fields><span>Transfer Custom Fields</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsvariant-facade-li>
<a href=/docs/navpatterns/patterns/variant-facade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsvariant-facade><span>Variant Facade</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns2-anti-patterns-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns2-anti-patterns-li>
<a href=/docs/navpatterns/2-anti-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns2-anti-patterns><span>2. Anti-Patterns</span></a>
<ul class="ul-3 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child active-path" id=m-docsnavpatterns2-anti-patternsnav-upgrade-li>
<a href=/docs/navpatterns/2-anti-patterns/nav-upgrade/ class="align-left pl-0 active td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsnav-upgrade><span class=td-sidebar-nav-active-item>Nav Upgrade</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatterns2-anti-patternsreusable-bugs-li>
<a href=/docs/navpatterns/2-anti-patterns/reusable-bugs/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsreusable-bugs><span>Reusable Bugs</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelines><span>3. CAL Coding Guidelines</span></a>
<ul class="ul-3 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesign-li>
@ -357,18 +323,14 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/variable-capacity-mismatch/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignvariable-capacity-mismatch><span>Variable Capacity Mismatch</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/with-scope-name-collision/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision><span>WITH Scope Name Collision</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types><span>Internally used DotNet Types</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization><span>Internationalization</span></a>
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate><span>Using Calcdate</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability><span>Localizability</span></a>
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilitycaptionml-for-system-tables-li>
@ -381,9 +343,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityuse-text-constants><span>Use Text Constants</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml><span>Using OptionCaptionML</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadability-li>
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<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesreadability><span>Readability</span></a>
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybegin-as-an-afterword-li>
@ -450,9 +410,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariable-naming><span>Variable Naming</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order><span>Variables Declarations Order</span></a>
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<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesux><span>UX</span></a>
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxactions-images-li>
@ -463,11 +421,7 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/fielderror/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxfielderror><span>FIELDERROR</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/message-and-error/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error><span>MESSAGE and ERROR</span></a>
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<a href=/docs/navpatterns/4-get-involved/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns4-get-involved><span>(OLD) Get Involved</span></a>
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedcode-of-conduct-li>
@ -476,13 +430,9 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/navpatterns/4-get-involved/patterns-authors/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedpatterns-authors><span>Patterns Authors</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns-li>
<a href=/docs/navpatterns/4-get-involved/template-for-writing-nav-design-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns><span>Template for writing Nav Design Patterns</span></a>
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<a href=/docs/navpatterns/related-links/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternsrelated-links><span>Related Links</span></a>
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<a href=/docs/contributing/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docscontributing><span>Contributing</span></a>
<ul class="ul-2 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docscontributingformattingtips-li>
@ -498,27 +448,14 @@ If the table is empty, it means that either the upgrade has run, or there was no
<a href=/docs/contributing/installhugo/manuallyonwindows11/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributinginstallhugomanuallyonwindows11><span>Manually on Windows 11</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docscontributinginstallhugousingpowershellonwindows11-li>
<a href=/docs/contributing/installhugo/usingpowershellonwindows11/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributinginstallhugousingpowershellonwindows11><span>Powershell on Windows 11</span></a>
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</ul>
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<a href=/docs/contributing/templates/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docscontributingtemplates><span>Templates</span></a>
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<a href=/docs/contributing/templates/patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributingtemplatespatterns><span>Pattern Name</span></a>
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<a href=/docs/contributing/templates/bestpractice/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributingtemplatesbestpractice><span>Title Here</span></a>
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@ -526,117 +463,36 @@ If the table is empty, it means that either the upgrade has run, or there was no
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<li><a href=#general-on-upgrade>General on upgrade</a></li><li><a href=#upgrade-code-can-it-be-rerun-safely>Upgrade code, can it be rerun safely?</a></li><li><a href=#parallelism>Parallelism</a></li><li><a href=#access-to-cloud-machines>Access to cloud machines</a></li></ul></li></ul></nav></div><div class="taxonomy taxonomy-terms-cloud taxo-tags">
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/al/ data-taxonomy-term=al><span class=taxonomy-label>AL</span><span class=taxonomy-count>30</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/api/ data-taxonomy-term=api><span class=taxonomy-label>API</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span><span class=taxonomy-count>136</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/decoupling/ data-taxonomy-term=decoupling><span class=taxonomy-label>Decoupling</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/extendability/ data-taxonomy-term=extendability><span class=taxonomy-label>Extendability</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/interface/ data-taxonomy-term=interface><span class=taxonomy-label>Interface</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/performance/ data-taxonomy-term=performance><span class=taxonomy-label>Performance</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/readability/ data-taxonomy-term=readability><span class=taxonomy-label>Readability</span><span class=taxonomy-count>53</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/telemetry/ data-taxonomy-term=telemetry><span class=taxonomy-label>Telemetry</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/testability/ data-taxonomy-term=testability><span class=taxonomy-label>Testability</span><span class=taxonomy-count>2</span></a></li></ul></div><div class="taxonomy taxonomy-terms-cloud taxo-categories">
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<a href=https://alguidelines.dev/docs/navpatterns/2-anti-patterns/>2. Anti-Patterns</a>
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<div class="taxonomy taxonomy-terms-article taxo-tags">
<h5 class=taxonomy-title>Tags:</h5>
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li>
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<h2 id=anti-patterns-in-nav-upgrade>Anti-Patterns in NAV Upgrade</h2>
<p><em>By Carlos Raul Garcia and Bogdana Botez at Microsoft Development Center Copenhagen</em></p>
<p><a href=upgrade.png><img src=upgrade.png alt=" "></a></p>
<p><strong>Context</strong>: when NAV is upgraded, whether on-premises or in the cloud, developers have the chance to write upgrade code to move data across changing data structures. Writing good quality code will help successful upgrades.</p>
<h3 id=general-on-upgrade>General on upgrade</h3>
<p><strong>Problem:</strong> assuming that the upgrade table contains data.</p>
<p>If the table is empty, it means that either the upgrade has run, or there was no data in the original tenant; in both cases, the upgrade code should exit immediately.</p>
<p><strong>Solution:</strong> if using an upgrade table, always validate that the table contains data before doing anything.</p>
<h3 id=upgrade-code-can-it-be-rerun-safely>Upgrade code, can it be rerun safely?</h3>
<p><strong>Problem</strong>: if the upgrade code is not written in a way that makes it runnable twice (<a href=http://stackoverflow.com/questions/1077412/what-is-an-idempotent-operation#1077421>idempotent</a>), then several failures can happen, including something as critical as data corruption.</p>
<p>In on premise NAV installations, if something fails at upgrade, there is no way to run only the &ldquo;remaining&rdquo; tasks. You will need to run the whole upgrade again, and might end-up with data that you cannot trust.</p>
<p>What about the cloud? In Platform As A Service (PaaS), in some situations, the upgrade code needs to be run twice (for example, when moving tenants from a broken/frozen VM to a healthy one).</p>
<p><strong>Solution:</strong> Make sure each of your upgrade procedures only kicks in if it didn&rsquo;t run before.</p>
<p><strong>Examples</strong></p>
<p>The examples below have happened in real live NAV PaaS upgrade:</p>
<p><strong>Table data overwrite</strong></p>
<ul>
<li><strong>Problem</strong>: at upgrade, a new column has bee­n added to a table and initialized with default values. In the meanwhile, during production, some of the default values are changed to production real life values. The second time the upgrade runs, those values will be overwritten with defaults, any personalization lost.</li>
<li><strong>Solution:</strong> before initializing with default values, check if non-default values exist.</li>
</ul>
<p><strong>Crash on math operations</strong></p>
<ul>
<li><strong>Problem:</strong> one tenant upgrade managed to divide by zero, by assuming a non-zero value.</li>
<li><strong>Solution:</strong> don&rsquo;t assume values can never be zero, always check before using them in divisions.</li>
</ul>
<p><strong>Use of external components</strong></p>
<ul>
<li><strong>Problem:</strong> a one-time registration through web services to an external service failed when attempting to register a second time.</li>
<li><strong>Solution:</strong> check if already registered, before attempting again.</li>
</ul>
<h3 id=parallelism>Parallelism</h3>
<p><strong>Problem</strong>: Upgrade procedures can be run in parallel, causing issues when different procedures attempt to modify the same table at the same time.</p>
<p>When modifications to the same table are being made from two or more different procedures, there is no guarantee on sequential run, or on a certain order they will be run in.</p>
<p><strong>Solution</strong>: if sequential or ordered execution is needed, make the affected upgrade procedures local and call them all, in the desired sequence, from a public upgrade procedure.</p>
<h3 id=access-to-cloud-machines>Access to cloud machines</h3>
<p><strong>Problem:</strong> dependencies on manual installation steps do not fit in the cloud.</p>
<p>If Dynamics NAV is installed on-premises, then any additional setup (like dependencies of external dlls, manual configuration steps etc.) can be done manually or semi-manually by the IT admin, at first setup and upgrade.</p>
<p>In the cloud, NAV partners don&rsquo;t have access to the machines &ndash; hence they cannot deploy and configure those external dependencies as they did in the old on-premises installations.</p>
<p><strong>Solution:</strong> Don&rsquo;t assume you will have access to PaaS or SaaS machines. Build your solution in such a way that it doesn&rsquo;t depend on executing manual configurations on the host machine.</p>
<div class="text-muted mt-5 pt-3 border-top">
<h5 class=taxonomy-title>Tags:</h5><ul class=taxonomy-terms>
<li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li></ul></div></header><h2 id=anti-patterns-in-nav-upgrade>Anti-Patterns in NAV Upgrade</h2><p><em>By Carlos Raul Garcia and Bogdana Botez at Microsoft Development Center Copenhagen</em></p><p><a href=upgrade.png><img src=upgrade.png alt=" "></a></p><p><strong>Context</strong>: when NAV is upgraded, whether on-premises or in the cloud, developers have the chance to write upgrade code to move data across changing data structures. Writing good quality code will help successful upgrades.</p><h3 id=general-on-upgrade>General on upgrade</h3><p><strong>Problem:</strong> assuming that the upgrade table contains data.</p><p>If the table is empty, it means that either the upgrade has run, or there was no data in the original tenant; in both cases, the upgrade code should exit immediately.</p><p><strong>Solution:</strong> if using an upgrade table, always validate that the table contains data before doing anything.</p><h3 id=upgrade-code-can-it-be-rerun-safely>Upgrade code, can it be rerun safely?</h3><p><strong>Problem</strong>: if the upgrade code is not written in a way that makes it runnable twice (<a href=http://stackoverflow.com/questions/1077412/what-is-an-idempotent-operation#1077421>idempotent</a>), then several failures can happen, including something as critical as data corruption.</p><p>In on premise NAV installations, if something fails at upgrade, there is no way to run only the &ldquo;remaining&rdquo; tasks. You will need to run the whole upgrade again, and might end-up with data that you cannot trust.</p><p>What about the cloud? In Platform As A Service (PaaS), in some situations, the upgrade code needs to be run twice (for example, when moving tenants from a broken/frozen VM to a healthy one).</p><p><strong>Solution:</strong> Make sure each of your upgrade procedures only kicks in if it didn&rsquo;t run before.</p><p><strong>Examples</strong></p><p>The examples below have happened in real live NAV PaaS upgrade:</p><p><strong>Table data overwrite</strong></p><ul>
<li><strong>Problem</strong>: at upgrade, a new column has bee­n added to a table and initialized with default values. In the meanwhile, during production, some of the default values are changed to production real life values. The second time the upgrade runs, those values will be overwritten with defaults, any personalization lost.</li><li><strong>Solution:</strong> before initializing with default values, check if non-default values exist.</li></ul><p><strong>Crash on math operations</strong></p><ul>
<li><strong>Problem:</strong> one tenant upgrade managed to divide by zero, by assuming a non-zero value.</li><li><strong>Solution:</strong> don&rsquo;t assume values can never be zero, always check before using them in divisions.</li></ul><p><strong>Use of external components</strong></p><ul>
<li><strong>Problem:</strong> a one-time registration through web services to an external service failed when attempting to register a second time.</li><li><strong>Solution:</strong> check if already registered, before attempting again.</li></ul><h3 id=parallelism>Parallelism</h3><p><strong>Problem</strong>: Upgrade procedures can be run in parallel, causing issues when different procedures attempt to modify the same table at the same time.</p><p>When modifications to the same table are being made from two or more different procedures, there is no guarantee on sequential run, or on a certain order they will be run in.</p><p><strong>Solution</strong>: if sequential or ordered execution is needed, make the affected upgrade procedures local and call them all, in the desired sequence, from a public upgrade procedure.</p><h3 id=access-to-cloud-machines>Access to cloud machines</h3><p><strong>Problem:</strong> dependencies on manual installation steps do not fit in the cloud.</p><p>If Dynamics NAV is installed on-premises, then any additional setup (like dependencies of external dlls, manual configuration steps etc.) can be done manually or semi-manually by the IT admin, at first setup and upgrade.</p><p>In the cloud, NAV partners don&rsquo;t have access to the machines &ndash; hence they cannot deploy and configure those external dependencies as they did in the old on-premises installations.</p><p><strong>Solution:</strong> Don&rsquo;t assume you will have access to PaaS or SaaS machines. Build your solution in such a way that it doesn&rsquo;t depend on executing manual configurations on the host machine.</p><div class="text-muted mt-5 pt-3 border-top">
Last modified February 24, 2022: <a href=https://github.com/microsoft/alguidelines/commit/5ee0436639455a35835c5ce88241d3fad662ee06>Added tags & categories + cleanup (5ee04366)</a>
by waldo1001
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