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arangosh&gt; db.ids.ensureIndex({ type: <span class="hljs-string">"skiplist"</span>, fields: [ <span class="hljs-string">"name.first"</span>, <span class="hljs-string">"name.last"</span> ], unique: <span class="hljs-literal">true</span> });
{
<span class="hljs-string">"id"</span> : <span class="hljs-string">"ids/16120"</span>,
<span class="hljs-string">"type"</span> : <span class="hljs-string">"skiplist"</span>,
<span class="hljs-string">"fields"</span> : [
<span class="hljs-string">"name.first"</span>,
<span class="hljs-string">"name.last"</span>
],
<span class="hljs-string">"unique"</span> : <span class="hljs-literal">true</span>,
<span class="hljs-string">"sparse"</span> : <span class="hljs-literal">false</span>,
<span class="hljs-string">"isNewlyCreated"</span> : <span class="hljs-literal">true</span>,
<span class="hljs-string">"code"</span> : <span class="hljs-number">201</span>
}
arangosh&gt; db.ids.save({ <span class="hljs-string">"name"</span> : { <span class="hljs-string">"first"</span> : <span class="hljs-string">"hans"</span>, <span class="hljs-string">"last"</span>: <span class="hljs-string">"hansen"</span> }});
{
<span class="hljs-string">"_id"</span> : <span class="hljs-string">"ids/16123"</span>,
<span class="hljs-string">"_key"</span> : <span class="hljs-string">"16123"</span>,
<span class="hljs-string">"_rev"</span> : <span class="hljs-string">"16123"</span>
}
arangosh&gt; db.ids.save({ <span class="hljs-string">"name"</span> : { <span class="hljs-string">"first"</span> : <span class="hljs-string">"jens"</span>, <span class="hljs-string">"last"</span>: <span class="hljs-string">"jensen"</span> }});
{
<span class="hljs-string">"_id"</span> : <span class="hljs-string">"ids/16127"</span>,
<span class="hljs-string">"_key"</span> : <span class="hljs-string">"16127"</span>,
<span class="hljs-string">"_rev"</span> : <span class="hljs-string">"16127"</span>
}
arangosh&gt; db.ids.save({ <span class="hljs-string">"name"</span> : { <span class="hljs-string">"first"</span> : <span class="hljs-string">"hans"</span>, <span class="hljs-string">"last"</span>: <span class="hljs-string">"jensen"</span> }});
{
<span class="hljs-string">"_id"</span> : <span class="hljs-string">"ids/16130"</span>,
<span class="hljs-string">"_key"</span> : <span class="hljs-string">"16130"</span>,
<span class="hljs-string">"_rev"</span> : <span class="hljs-string">"16130"</span>
}
[ArangoError <span class="hljs-number">1210</span>: cannot create <span class="hljs-built_in">document</span>, unique constraint violated]