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copied!<p>If your class has a property called <code>Id</code>, RavenDB will use that as document id by default.</p> <p>In your case, having an instance of <code>MyItem</code> with <code>Id</code> set to <code>303</code>, means that the document will be saved in the database with an Id of <code>MyItems/303</code>.</p> <p>You can test that easily by modifying the </p> <pre><code>session.Store(new MyItem { Id = 303, Test = "TEST" }, path); </code></pre> <p>line with </p> <pre><code>session.Store(new MyItem { Id = 303, Test = "TEST" }); </code></pre> <p>This will work and the result will be:</p> <p><img src="https://i.stack.imgur.com/aMJt8.png" alt="Saved document"></p> <p>So, the issue is that you are instructing Raven to assign two IDs to your object:</p> <ul> <li><code>MyItems/303</code>, due to the value of the <code>Id</code> property</li> <li><code>mykeypath/44</code>, due to the fact that you're explicitly setting this Id by using the <code>Store</code> overload.</li> </ul> <p>The solution I would apply in this case is to rename the <code>Id</code> property. If that's not possible (ex: the class is already used for other purposes, like a WCF contract), consider creating a new class used solely for RavenDB persistence and map between the two (tools like <a href="https://github.com/AutoMapper/AutoMapper" rel="nofollow noreferrer">AutoMapper</a> make this easy).</p> <h3>Update</h3> <p>I found a way to bend the <code>Id</code> field convention by looking at <a href="https://groups.google.com/forum/#!topic/ravendb/Ly10rvbVrcM" rel="nofollow noreferrer">this thread</a>. In your case, you should do the following prior to opening the session:</p> <pre><code>_documentStore.Conventions.FindIdentityProperty = prop => { if (prop.DeclaringType == typeof (AuditableEntity)) return prop.Name == "CustomId"; return prop.Name == "Id"; }; </code></pre> <p>What this says is that the property <code>Id</code> defined by the type <code>AuditableEntity</code> should not be used as a document identifier. In all other cases, do the default.</p> <p>I tested it and it works fine, showing two Id fields in the RavenDb studio :) :</p> <p><img src="https://i.stack.imgur.com/01Pwa.png" alt="enter image description here"></p>

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