Provide the Book Ancestors views field from Entity API on D7
>>> [!note] Migrated issue
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Reported by: [damienmckenna](https://www.drupal.org/user/108450)
Related to !120
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The Entity API module provided a property/field called "book_ancestors" with this code:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> $ancestors </span><span style="color: #007700">= array();<br> while (!empty(</span><span style="color: #0000BB">$node</span><span style="color: #007700">-></span><span style="color: #0000BB">book</span><span style="color: #007700">[</span><span style="color: #DD0000">'plid'</span><span style="color: #007700">]) && </span><span style="color: #0000BB">$node</span><span style="color: #007700">-></span><span style="color: #0000BB">book</span><span style="color: #007700">[</span><span style="color: #DD0000">'plid'</span><span style="color: #007700">] != -</span><span style="color: #0000BB">1</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">$link </span><span style="color: #007700">= </span><span style="color: #0000BB">book_link_load</span><span style="color: #007700">(</span><span style="color: #0000BB">$node</span><span style="color: #007700">-></span><span style="color: #0000BB">book</span><span style="color: #007700">[</span><span style="color: #DD0000">'plid'</span><span style="color: #007700">]);<br> </span><span style="color: #0000BB">array_unshift</span><span style="color: #007700">(</span><span style="color: #0000BB">$ancestors</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">[</span><span style="color: #DD0000">'nid'</span><span style="color: #007700">]);<br> </span><span style="color: #0000BB">$node </span><span style="color: #007700">= </span><span style="color: #0000BB">node_load</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">[</span><span style="color: #DD0000">'nid'</span><span style="color: #007700">]);<br> }<br> return </span><span style="color: #0000BB">$ancestors</span><span style="color: #007700">;<br></span><span style="color: #0000BB">?></span></span></pre></div>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Recreate the "book_ancestors" code as an appropriate plugin.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>Add the necessary logic.</p>
<h3 id="summary-ui-changes">User interface changes</h3>
<p>A plugin exists that displays the Book Ancestors code.</p>
<h3 id="summary-api-changes">API changes</h3>
<p>TBD</p>
<h3 id="summary-data-model-changes">Data model changes</h3>
<p>n/a</p>
issue