Provide upgrade pathway from 5.x with Role mapping feature breaking sites running 6.x
>>> [!note] Migrated issue
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<!-- Migrated from issue #3562450. -->
Reported by: [codebymikey](https://www.drupal.org/user/3573206)
Related to !45
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>After updating to 6.0.x from 5.0.x, noticed that the <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/o365/-/work_items/3511288" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/o365/-/work_items/3511288</a></span> issue introduced some unintentional breaking changes between the updates, first being:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br>TypeError</span><span style="color: #007700">: </span><span style="color: #0000BB">Cannot assign null to property Drupal</span><span style="color: #007700">\</span><span style="color: #0000BB">o365</span><span style="color: #007700">\</span><span style="color: #0000BB">RolesService</span><span style="color: #007700">::</span><span style="color: #0000BB">$defaultRole of type string in Drupal</span><span style="color: #007700">\</span><span style="color: #0000BB">o365</span><span style="color: #007700">\</span><span style="color: #0000BB">RolesService</span><span style="color: #007700">-></span><span style="color: #0000BB">getConfiguredRoles</span><span style="color: #007700">() (</span><span style="color: #0000BB">line 209 of </span><span style="color: #007700">/var/</span><span style="color: #0000BB">www</span><span style="color: #007700">/</span><span style="color: #0000BB">html</span><span style="color: #007700">/</span><span style="color: #0000BB">application</span><span style="color: #007700">/</span><span style="color: #0000BB">web</span><span style="color: #007700">/</span><span style="color: #0000BB">modules</span><span style="color: #007700">/</span><span style="color: #0000BB">contrib</span><span style="color: #007700">/</span><span style="color: #0000BB">o365</span><span style="color: #007700">/</span><span style="color: #0000BB">src</span><span style="color: #007700">/</span><span style="color: #0000BB">RolesService</span><span style="color: #007700">.</span><span style="color: #0000BB">php</span><span style="color: #007700">).<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>And this is because the default role is <code>NULL</code> (we should probably try and move away from special values like <code>_none</code> entirely from the config, and favour an empty string instead.</p>
<p>The second being, that it enforces the user role mapping functionality on everyone, resulting in existing roles being removed from the user.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>1. Ignore the user role mapping behaviour if there are no configured role mappings.<br>
2. Introduce a config schema for the role settings.<br>
3. Add a default <code>config/install</code> entry for the role settings.<br>
4. Ideally add an update hook that sets the default config values for sites updating from 5.x (not strictly necessary)</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>Provide MR addressing issues.</p>
<h3 id="summary-ui-changes">User interface changes</h3>
<p>N/A</p>
<h3 id="summary-api-changes">API changes</h3>
<p>N/A</p>
issue
GitLab AI Context
Project: project/o365
Instance: https://git.drupalcode.org
Before proposing or making any changes, READ each of these files and FOLLOW their guidance:
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Repository: https://git.drupalcode.org/project/o365
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