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PONHibernate Error Message: object references an unsaved transient instance - save the transient instance before flushing
 

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  1. PONHibernate Error Message: object references an unsaved transient instance - save the transient instance before flushing
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    <p>I'm using nHibernate and trying to add some master-detail data. The database diagram is attached here. <img src="https://i.stack.imgur.com/82cl8.png" alt="Database diagram"></p> <p>The following is the code for adding a category along with two products:</p> <pre><code>//Category namespace Sample.CustomerService.Domain { public class Category { public Category() { Products = new List&lt;Product&gt;(); } public virtual int CategoryID { get; set; } public virtual IList&lt;Product&gt; Products { get; set; } public virtual string Name { get; set; } public virtual string Unit { get; set; } public virtual void AddProduct(Product product) { Products.Add(product); } } } //CategoryMap namespace Sample.CustomerService.Domain { public class CategoryMap : ClassMap&lt;Category&gt; { public CategoryMap() { Table("Category"); LazyLoad(); Id(x =&gt; x.CategoryID).GeneratedBy.Identity().Column("CategoryID"); Map(x =&gt; x.Name).Column("Name").Not.Nullable().Length(50); Map(x =&gt; x.Unit).Column("Unit").Not.Nullable().Length(3); HasMany(x =&gt; x.Products).KeyColumn("CategoryID"); } } } //-------------------------------------------------------------------------------------------- //Product namespace Sample.CustomerService.Domain { public class Product { public Product() { } public virtual int ProductID { get; set; } public virtual Category Category { get; set; } public virtual string Name { get; set; } public virtual decimal UnitPrice { get; set; } } } //ProductMap namespace Sample.CustomerService.Domain { public class ProductMap : ClassMap&lt;Product&gt; { public ProductMap() { Table("Product"); LazyLoad(); Id(x =&gt; x.ProductID).GeneratedBy.Identity().Column("ProductID"); References(x =&gt; x.Category).Column("CategoryID"); Map(x =&gt; x.Name).Column("Name").Not.Nullable().Length(50); Map(x =&gt; x.UnitPrice).Column("UnitPrice").Not.Nullable(); } } } //---------------------------------------------------------------------------------------------- //Program namespace WindowsHibernateTest { public partial class TestClass : Form { public TestClass() { InitializeComponent(); CreateNewProduct(); } public void CreateNewProduct() { try { var sessionFactory = CreateSessionFactory(); using (var session = sessionFactory.OpenSession()) { using (var sqlTrans = session.BeginTransaction()) { Category newGold = new Category() { Name = "Gold", Unit = "GRM" }; Product ngOrn = new Product() { Name = "Bangles", UnitPrice = 1000.10M }; Product ogOrn = new Product() { Name = "Rings", UnitPrice = 2000.10M }; AddProductsToCategory(newGold, ngOrn, ogOrn); session.SaveOrUpdate(newGold); sqlTrans.Commit(); } } } catch (Exception ex) { MessageBox.Show(ex.Message); } } private static ISessionFactory CreateSessionFactory() { return Fluently.Configure().Database(MsSqlConfiguration.MsSql2005. ConnectionString("Data Source=MyDB; Initial Catalog=NHibernateTest; Trusted_Connection=true;")).Mappings(m =&gt; m.FluentMappings.AddFromAssemblyOf&lt;Program&gt;()).BuildSessionFactory(); } public static void AddProductsToCategory(Category category, params Product[] products) { foreach (var product in products) { category.AddProduct(product); } } } } </code></pre> <p>In the line <code>sqlTrans.Commit()</code>, I'm getting the following error: </p> <blockquote> <p>object references an unsaved transient instance - save the transient instance before flushing. Type: Sample.CustomerService.Domain.Product, Entity: Sample.CustomerService.Domain.Product</p> </blockquote> <p>I've Googled for quite sometime and didn't get convincing solutions for this. I've tried <a href="https://stackoverflow.com/questions/2302802/object-references-an-unsaved-transient-instance-save-the-transient-instance-be">this</a>, <a href="https://stackoverflow.com/questions/3144402/nhibernate-object-references-an-unsaved-transient-instance-save-the-transien">this</a> and <a href="https://stackoverflow.com/questions/6596289/object-references-an-unsaved-transient-instance-save-the-transient-instance-befo">this</a>, but could not able to resolve this error. Please help me to resolve this error. Thanks in advance.</p>
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    1. COdon't know if that is your problem but you need to change the add product method you got there: foreach (var product in products) { category.AddProduct(product); product.Category = category; }
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