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POUpdating an embedded document in MongoDB with official C# driver
 

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    <p>If I have a Company collection which contains embedded Divisions:</p> <pre><code>{ "_id": 1 "_t": "Company", "Name": "Test Company" "Divisions": [ { "_id": 1 "_t": "Division", "Name": "Test Division 1" }, { "_id": 2 "_t": "Division", "Name": "Test Division 2" } ] } </code></pre> <p>What is the best way to save/update an entire Division when using the <a href="http://www.mongodb.org/display/DOCS/CSharp+Language+Center" rel="noreferrer">official 10gen C# driver</a>? (The latest 0.9 release.)</p> <p>I'm using Update.AddToSetWrapped to add Divisions, and that works fine, but I'd also like to be able to update documents depending on their _id.</p> <p>For example, if I define the following Update method: </p> <pre><code>public void UpdateDivision(IDivision division) { var mongo = MongoServer.Create(_connectionString); var database = mongo.GetDatabase(_databaseName); var query = Query.EQ("_id", division.CompanyId); var update = Update.AddToSetWrapped("Divisions", division); database.GetCollection&lt;Company&gt;("Company") .Update(query, update, UpdateFlags.Upsert, SafeMode.True); } </code></pre> <p>and call it like so: </p> <pre><code>var division = GetDivisionById(1); division.Name = "New Name"; UpdateDivision(division); </code></pre> <p>Then a new instance of Division will be added to the set, because although the "_id" is still 1, the Name is different, and therefore it is a unique document.</p> <p>So what is there a good way to update a whole embedded document?</p> <p>Until I come up with a better solution I am going to first <code>$pull</code> the original Division and then <code>$addToSet</code> with the modified Division. That works but is obviously not ideal as it performs two separate updates.</p>
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