Working on a multi-domain compatible version of TacJS...
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3317075. -->
Reported by: [mably](https://www.drupal.org/user/3375160)
Related to !9
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>We are using a customized version of TacJS for a <a href="https://www.drupal.org/project/domain">multi-domain</a> Drupal 9 instance.</p>
<p>In current state of the module, we have to duplicate a lot of existing code.</p>
<p>A few small updates to the code of the module who allows us to drastically reduce our amount of duplicated code.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>We mostly have to duplicate the form code (<code>buildForm</code> and <code>submitForm</code>).</p>
<p>First of all, access to the <code>config</code> object should be done in a custom method to we can override it easily to access to our custom domain specific configuration.</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> </span><span style="color: #FF8000">/**<br> * {@inheritdoc}<br> */<br> </span><span style="color: #007700">public function </span><span style="color: #0000BB">buildForm</span><span style="color: #007700">(array </span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">FormStateInterface $form_state</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">$config </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">config</span><span style="color: #007700">(</span><span style="color: #DD0000">'tacjs.settings'</span><span style="color: #007700">);<br> (...)<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>Should be converted to something like:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> </span><span style="color: #FF8000">/**<br> * Get configuration.<br> */<br> </span><span style="color: #007700">protected function </span><span style="color: #0000BB">getConfig</span><span style="color: #007700">() {<br> return </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">config</span><span style="color: #007700">(</span><span style="color: #DD0000">'tacjs.settings'</span><span style="color: #007700">);<br> }<br><br> </span><span style="color: #FF8000">/**<br> * {@inheritdoc}<br> */<br> </span><span style="color: #007700">public function </span><span style="color: #0000BB">buildForm</span><span style="color: #007700">(array </span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">FormStateInterface $form_state</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">$config </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">getConfig</span><span style="color: #007700">();<br> (...)<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>Our domain <code>getConfig</code> method would look something like:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> </span><span style="color: #FF8000">/**<br> * Get configuration.<br> */<br> </span><span style="color: #007700">protected function </span><span style="color: #0000BB">getConfig</span><span style="color: #007700">() {<br> </span><span style="color: #0000BB">$domain_id </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">getRequest</span><span style="color: #007700">()-></span><span style="color: #0000BB">get</span><span style="color: #007700">(</span><span style="color: #DD0000">'domain_id'</span><span style="color: #007700">);<br> </span><span style="color: #0000BB">$config </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">config</span><span style="color: #007700">(</span><span style="color: #DD0000">'tacjs_domain.' </span><span style="color: #007700">. </span><span style="color: #0000BB">$domain_id </span><span style="color: #007700">. </span><span style="color: #DD0000">'.settings'</span><span style="color: #007700">);<br> if (</span><span style="color: #0000BB">$config</span><span style="color: #007700">-></span><span style="color: #0000BB">isNew</span><span style="color: #007700">()) {<br> </span><span style="color: #0000BB">$config</span><span style="color: #007700">-></span><span style="color: #0000BB">merge</span><span style="color: #007700">(</span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">config</span><span style="color: #007700">(</span><span style="color: #DD0000">'tacjs.settings'</span><span style="color: #007700">)-></span><span style="color: #0000BB">getRawData</span><span style="color: #007700">());<br> }<br> return </span><span style="color: #0000BB">$config</span><span style="color: #007700">;<br> }<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>Ideally the form construction should also be done in its own distinct method so we could easily override it to add our domain related elements.</p>
<p>For example through a new <code>addFormElements</code> method:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> </span><span style="color: #FF8000">/**<br> * Add elements to form.<br> */<br> </span><span style="color: #007700">protected function </span><span style="color: #0000BB">addFormElements</span><span style="color: #007700">(array &</span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">Config $config</span><span style="color: #007700">) {<br><br> foreach (</span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">languageManager</span><span style="color: #007700">-></span><span style="color: #0000BB">getLanguages</span><span style="color: #007700">() as </span><span style="color: #0000BB">$key </span><span style="color: #007700">=> </span><span style="color: #0000BB">$value</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">$langcodes</span><span style="color: #007700">[</span><span style="color: #0000BB">$key</span><span style="color: #007700">] = </span><span style="color: #0000BB">$value</span><span style="color: #007700">-></span><span style="color: #0000BB">getName</span><span style="color: #007700">();<br> }<br><br> </span><span style="color: #0000BB">$form</span><span style="color: #007700">[</span><span style="color: #DD0000">'services'</span><span style="color: #007700">] = [<br> </span><span style="color: #DD0000">'#type' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'vertical_tabs'</span><span style="color: #007700">,<br> </span><span style="color: #DD0000">'#title' </span><span style="color: #007700">=> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">t</span><span style="color: #007700">(</span><span style="color: #DD0000">'Add Services'</span><span style="color: #007700">),<br> </span><span style="color: #DD0000">'#title_display' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'invisible'</span><span style="color: #007700">,<br> ];<br><br> (...)<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>Our custom domain version would then look like:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> </span><span style="color: #FF8000">/**<br> * Add elements to form.<br> */<br> </span><span style="color: #007700">protected function </span><span style="color: #0000BB">addFormElements</span><span style="color: #007700">(array &</span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">Config $config</span><span style="color: #007700">) {<br><br> </span><span style="color: #0000BB">$domain_id </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">getRequest</span><span style="color: #007700">()-></span><span style="color: #0000BB">get</span><span style="color: #007700">(</span><span style="color: #DD0000">'domain_id'</span><span style="color: #007700">);<br><br> </span><span style="color: #0000BB">$form</span><span style="color: #007700">[</span><span style="color: #DD0000">'domain_id'</span><span style="color: #007700">] = [<br> </span><span style="color: #DD0000">'#type' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'hidden'</span><span style="color: #007700">,<br> </span><span style="color: #DD0000">'#title' </span><span style="color: #007700">=> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">t</span><span style="color: #007700">(</span><span style="color: #DD0000">'Domain ID'</span><span style="color: #007700">),<br> </span><span style="color: #DD0000">'#default_value' </span><span style="color: #007700">=> </span><span style="color: #0000BB">$domain_id</span><span style="color: #007700">,<br> ];<br><br> </span><span style="color: #0000BB">$form</span><span style="color: #007700">[</span><span style="color: #DD0000">'domain'</span><span style="color: #007700">] = [<br> </span><span style="color: #DD0000">'#prefix' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'<p>'</span><span style="color: #007700">,<br> </span><span style="color: #DD0000">'#suffix' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'</p>'</span><span style="color: #007700">,<br> </span><span style="color: #DD0000">'#markup' </span><span style="color: #007700">=> </span><span style="color: #0000BB">t</span><span style="color: #007700">(</span><span style="color: #DD0000">'Domain: @domain_id'</span><span style="color: #007700">, [</span><span style="color: #DD0000">'@domain_id' </span><span style="color: #007700">=> </span><span style="color: #0000BB">$domain_id</span><span style="color: #007700">]),<br> </span><span style="color: #DD0000">'#weight' </span><span style="color: #007700">=> -</span><span style="color: #0000BB">100</span><span style="color: #007700">,<br> ];<br><br> </span><span style="color: #0000BB">parent</span><span style="color: #007700">::</span><span style="color: #0000BB">addFormElements</span><span style="color: #007700">(</span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">$config</span><span style="color: #007700">);<br> }<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>The final <code>buildForm</code> method that wouldn't need to be overridden would look like:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> </span><span style="color: #FF8000">/**<br> * {@inheritdoc}<br> */<br> </span><span style="color: #007700">public function </span><span style="color: #0000BB">buildForm</span><span style="color: #007700">(array </span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">FormStateInterface $form_state</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">$config </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">getConfig</span><span style="color: #007700">();<br><br> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">addFormElements</span><span style="color: #007700">(</span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">$config</span><span style="color: #007700">);<br><br> return </span><span style="color: #0000BB">parent</span><span style="color: #007700">::</span><span style="color: #0000BB">buildForm</span><span style="color: #007700">(</span><span style="color: #0000BB">$form</span><span style="color: #007700">, </span><span style="color: #0000BB">$form_state</span><span style="color: #007700">);<br> }<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>The same type of small refactoring should be done on the <code>submitForm</code> method.</p>
<p>This update would drastically facilitate the maintenance of your <a href="https://www.drupal.org/project/domain">domain</a> compatible version of TacJS and eventually allow us to publish it on Drupal.org website.</p>
<p>If interested, I'm willing to prepare a MR request implementing the required changes.</p>
<p>Thanks for all.</p>
issue
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Project: project/tacjs
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