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POWhy isn't my NHibernate bag collection setting the 'parent id' of the children dynamically?
 

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  1. POWhy isn't my NHibernate bag collection setting the 'parent id' of the children dynamically?
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    <p>I have a new object with a collection of new objects within it on some property as an IList. I see through sql profiler two insert queries being executed.. one for the parent, which has the new guid id, and one for the child, however, the foreign-key on the child that references the parent, is an empty guid. Here is my mapping on the parent: </p> <pre><code>&lt;id name="BackerId"&gt; &lt;generator class="guid" /&gt; &lt;/id&gt; &lt;property name="Name" /&gt; &lt;property name="PostCardSizeId" /&gt; &lt;property name="ItemNumber" /&gt; &lt;bag name="BackerEntries" table="BackerEntry" cascade="all" lazy="false" order-by="Priority"&gt; &lt;key column="BackerId" /&gt; &lt;one-to-many class="BackerEntry" /&gt; &lt;/bag&gt; </code></pre> <p>On the Backer.cs class, I defined BackerEntries property as </p> <pre><code>IList&lt;BackerEntry&gt; </code></pre> <p>When I try to SaveOrUpdate the passed in entity I get the following results in sql profiler:</p> <p>exec sp_executesql N'INSERT INTO Backer (Name, PostCardSizeId, ItemNumber, BackerId) VALUES (@p0, @p1, @p2, @p3)',N'@p0 nvarchar(3),@p1 uniqueidentifier,@p2 nvarchar(3),@p3 uniqueidentifier',@p0=N'qaa',@p1='BC95E7EB-5EE8-44B2-82FF30F5176684D',@p2=N'qaa',@p3='18FBF8CE-FD22-4D08-A3B1-63D6DFF426E5'</p> <p>exec sp_executesql N'INSERT INTO BackerEntry (BackerId, BackerEntryTypeId, Name, Description, MaxLength, IsRequired, Priority, BackerEntryId) VALUES (@p0, @p1, @p2, @p3, @p4, @p5, @p6, @p7)',N'@p0 uniqueidentifier,@p1 uniqueidentifier,@p2 nvarchar(5),@p3 nvarchar(5),@p4 int,@p5 bit,@p6 int,@p7 uniqueidentifier',@p0='00000000-0000-0000-0000-000000000000',@p1='2C5BDD33-5DD3-42EC-AA0E-F1E548A5F6E4',@p2=N'qaadf',@p3=N'wasdf',@p4=0,@p5=1,@p6=0,@p7='FE9C4A35-6211-4E17-A75A-60CCB526F1CA'</p> <p>As you can see, its not resetting the empty guid for BackerId on the child to the new real guid of the parent.</p> <p>Finally, the exception throw is: </p> <pre><code>"NHibernate.Exceptions.GenericADOException: could not insert: [CB.ThePostcardCompany.MiddleTier.BackerEntry][SQL: INSERT INTO BackerEntry (BackerId, BackerEntryTypeId, Name, Description, MaxLength, IsRequired, Priority, BackerEntryId) VALUES (?, ?, ?, ?, ?, ?, ?, ?)] ---\u003e System.Data.SqlClient.SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint </code></pre> <p>EDIT: SOLVED! The first answer below pointed me into the correct direction. I needed to add that back reference on the child mapping and class. This allowed it to work in a purely .net way - however, when accepting json, there was a disconnect so I had to come up with some quirky code to 're-attach' the children.</p>
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