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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">I have to admit that you lost me. Could you give some code examples of what's not possible in CouchDB and what alternative you have used?</p>
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<p style="margin: 10px 0 0 0">AFAICS, CouchDB uses Strings as id, i.e. you can't use an embedded document as we do for MongoDB for composite ids:</p>
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{
<span class="code-quote" style="color: #009100">"_id"</span> : {
<span class="code-quote" style="color: #009100">"author"</span> : <span class="code-quote" style="color: #009100">"Guillaume"</span>,
<span class="code-quote" style="color: #009100">"title"</span> : <span class="code-quote" style="color: #009100">"There are more than 20 JUGs in France"</span>
},
<span class="code-quote" style="color: #009100">"content"</span> : <span class="code-quote" style="color: #009100">"Great! Congratulations folks"</span>,
<span class="code-quote" style="color: #009100">"labels"</span> : [ { <span class="code-quote" style="color: #009100">"id"</span> : NumberLong(5) } ]
}
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<p style="margin: 10px 0 0 0">Instead, the CouchDB dialect concatenates the id attribute name(s) and value(s) like this:</p>
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{
<span class="code-quote" style="color: #009100">"_id"</span>: <span class="code-quote" style="color: #009100">"News:newsId.author_newsId.title_:Guillaume_There are more than 20 JUGs in France_"</span>,
<span class="code-quote" style="color: #009100">"_rev"</span>: <span class="code-quote" style="color: #009100">"1-bcfae27085f38d0d8596fb97558cd130"</span>,
<span class="code-quote" style="color: #009100">"type"</span>: <span class="code-quote" style="color: #009100">"CouchDBEntity"</span>,
<span class="code-quote" style="color: #009100">"tableName"</span>: <span class="code-quote" style="color: #009100">"News"</span>,
<span class="code-quote" style="color: #009100">"content"</span>: <span class="code-quote" style="color: #009100">"Great! Congratulations folks"</span>,
<span class="code-quote" style="color: #009100">"newsId"</span>: {
<span class="code-quote" style="color: #009100">"author"</span>: <span class="code-quote" style="color: #009100">"Guillaume"</span>,
<span class="code-quote" style="color: #009100">"title"</span>: <span class="code-quote" style="color: #009100">"There are more than 20 JUGs in France"</span>
}
}
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<p style="margin: 10px 0 0 0">The id attributes are stored additionally in their natural form. We could retrieve these from the id, but I thought considering searches it makes sense to keep them as such (same for the table name). We might consider omitting the attribute name within the concatenation for the default case of a single id property.</p>
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