<p dir="auto">In case you don't want <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="1877678945" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/4215" data-hovercard-type="pull_request" data-hovercard-url="/openstreetmap/openstreetmap-website/pull/4215/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/pull/4215">#4215</a>, there's already a defacto url scheme with user ids: <code class="notranslate">/user/user_id</code>. That's what deleted accounts get reset to. But it has a couple of problems. "user_12345" is a valid username for anyone, not just the user with id=12345. Depending on how many usernames with this pattern already exist, we may want to stop allowing new ones.</p>
<p dir="auto">I know one active user with this kind of name, but it matches their id.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/4218'>https://github.com/openstreetmap/openstreetmap-website/pull/4218</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/4218/commits/4cbd9af669ea448746f668e61231c35aa67cc520" class="commit-link">4cbd9af</a>  Disallow username changes to user_n if n isn't their id</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/4218/files">3 files</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4218/files#diff-9802ca3c9c4cf89904fd44bc114e35ebdf2c5dd3d5b645491e2b253e1afef29b">app/models/user.rb</a>
    (7)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4218/files#diff-44438ce218f5287c58d0017f965d888715635d94280669896f75841fbd7b4cd7">config/locales/en.yml</a>
    (1)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4218/files#diff-91bef9fda3c55514e23a4a8edba948f68aad59b57951adcff0b11e9ea9159854">test/models/user_test.rb</a>
    (22)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/4218.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/4218.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/4218.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/4218.diff</a></li>
</ul>

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