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PONHibernate: Using Fluent Nhibernate to save child objects
 

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    <p>In my system, I have two entities - ShoppingCart and ShoppingCartItem. Fairly generic use-case. However, when I save my ShoppingCart, none of the items are being saved to the DB. </p> <p>Within my object, I create a new ShoppingCart object.</p> <pre><code>ShoppingCart cart = CreateOrGetCart(); </code></pre> <p>I then add an existing Product which I got from the database to the start. </p> <pre><code>cart.AddItem(product); </code></pre> <p>This is just a simple wrapper to add the item to the IList.</p> <pre><code> public virtual void AddItem(Product product) { Items.Add(new ShoppingCartItem { Quantity = 1, Product = product }); } </code></pre> <p>I then call SaveOrUpdate on the Repository</p> <pre><code>Repository.SaveOrUpdate(cart); </code></pre> <p>Which looks like this:</p> <pre><code> public T SaveOrUpdate(T entity) { Session.SaveOrUpdate(entity); return entity; } </code></pre> <p>I'm using Fluent NHibernate for the mapping:</p> <pre><code> public ShoppingCartItemMap() { WithTable("ShoppingCartItems"); Id(x =&gt; x.ID, "ShoppingCartItemId"); Map(x =&gt; x.Quantity); References(x =&gt; x.Cart, "ShoppingCartId").Cascade.SaveUpdate(); References(x =&gt; x.Product, "ProductId"); } public ShoppingCartMap() { WithTable("ShoppingCarts"); Id(x =&gt; x.ID, "ShoppingCartId"); Map(x =&gt; x.Created); Map(x =&gt; x.Username); HasMany&lt;ShoppingCartItem&gt;(x =&gt; x.Items) .IsInverse().Cascade.SaveUpdate() .WithKeyColumn("ShoppingCartId") .AsBag(); } </code></pre> <p>Database Schema (SQL Server 2005) is also fairly generic:</p> <pre><code>CREATE TABLE [dbo].[ShoppingCarts] ( [ShoppingCartID] [int] NOT NULL IDENTITY(1, 1), [Username] [nvarchar] (50) NOT NULL, [Created] [datetime] NOT NULL ) GO ALTER TABLE [dbo].[ShoppingCarts] ADD CONSTRAINT [PK_ShoppingCarts] PRIMARY KEY CLUSTERED ([ShoppingCartID]) GO CREATE TABLE [dbo].[ShoppingCartItems] ( [ShoppingCartItemId] [int] NOT NULL IDENTITY(1, 1), [ShoppingCartId] [int] NOT NULL, [ProductId] [int] NOT NULL, [Quantity] [int] NOT NULL ) GO ALTER TABLE [dbo].[ShoppingCartItems] ADD CONSTRAINT [PK_ShoppingCartItems] PRIMARY KEY CLUSTERED ([ShoppingCartItemId]) GO ALTER TABLE [dbo].[ShoppingCartItems] ADD CONSTRAINT [FK_ShoppingCartItems_Products] FOREIGN KEY ([ProductId]) REFERENCES [dbo].[Products] ([ProductId]) GO ALTER TABLE [dbo].[ShoppingCartItems] ADD CONSTRAINT [FK_ShoppingCartItems_ShoppingCarts] FOREIGN KEY ([ShoppingCartId]) REFERENCES [dbo].[ShoppingCarts] ([ShoppingCartID]) GO </code></pre> <p>When I SaveOrUpdate my ShoppingCart, why isn't any ShoppingCartItems also being saved? </p> <p>Please help.</p> <p>Thanks</p> <p>Ben</p> <p>UPDATE: Wrapping it in a transaction providng me with some more info:</p> <blockquote> <p>Cannot insert the value NULL into column 'ShoppingCartId', table 'WroxPizza.dbo.ShoppingCartItems'; column does not allow nulls. INSERT fails. The statement has been terminated.</p> </blockquote> <p>This is because it's a new cart.</p>
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