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<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #ccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin: 10px 0 0 0"> Essentially it is handed the GenerationType and the id attribute's type (XClass)</p>
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<p style="margin: 10px 0 0 0">A pluggable contract for determining the generator type taking these two things as input would already help us. We could then address the following use case (by mapping AUTO to IDENTITY in this case):</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
<span class="code-keyword" style="color: #000091">private</span> org.bson.types.ObjectId id;
</pre>
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<p style="margin: 10px 0 0 0">In addition it would also be interesting to take the given <tt>@Type</tt> into account. If that was possible as well, we could do the following:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// Persisted as <span class="code-object" style="color: #910091; color: #808080">String</span> -> AUTO mapped to UUID generator
</span>@Id
@GeneratedValue(strategy = GenerationType.AUTO)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> id;
</pre>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// Persisted as MongoDB's ObjectId -> AUTO mapped to IDENTITY generator
</span>@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Type(type = <span class="code-quote" style="color: #009100">"objectid"</span>)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> id;
</pre>
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