[英]Fluent NHibernate (with automapping) not saving join table values in many-to-many
我不是NHibernate專家,所以這可能是該部門缺乏理解。 我有兩個簡單的實體,具有多對多的關系
public class Category
{
public virtual int Id { get; private set; }
public virtual string Name { get; set; }
public virtual string Description { get; set; }
public virtual bool Visible { get; set; }
public virtual IList<Product> Products { get; set; }
}
和
public class Product
{
public virtual int Id { get; private set; }
public virtual string Name { get; set; }
public virtual string Description { get; set; }
public virtual decimal Price { get; set; }
public virtual bool Visible { get; set; }
public virtual IList<Category> Categories { get; set; }
}
我的配置是
public static void BuildFactory()
{
_factory = Fluently.Configure()
.Database(
MsSqlConfiguration
.MsSql2008
.ConnectionString(_connectionString)
.ShowSql()
)
.Mappings(m =>
m.AutoMappings.Add(
AutoMap.AssemblyOf<Database>()
.Where(t => t.Namespace == "FancyStore.Models.Catalog")
.Override<Product>(k =>
k.HasManyToMany(x => x.Categories)
.Table("ProductsToCategories")
.ParentKeyColumn("Product_id")
.ChildKeyColumn("Category_id")
.Cascade.AllDeleteOrphan())
.Override<Category>(k =>
k.HasManyToMany(x => x.Products)
.Table("ProductsToCategories")
.ParentKeyColumn("Category_id")
.ChildKeyColumn("Product_id")
.Cascade.AllDeleteOrphan().Inverse())
)
)
.ExposeConfiguration(SetConfiguration)
.BuildConfiguration()
.BuildSessionFactory();
}
所以我開始時沒有覆蓋(稍后在一些谷歌搜索后添加它們),並使用ExportSchema生成我的模式。 ExportSchema知道多對多關系(即使沒有覆蓋),因為它生成了一個連接表( ProductsToCategories
)。
我想添加一些簡單的測試數據,所以我這樣做了
using (var db = new Repository<Category>())
{
for (int i = 0; i < 6; i++)
{
var cat = new Category
{
Name = "Things" + i,
Description = "Things that are things",
Visible = true,
Products = new List<Product>()
};
for (int k = 0; k < 6; k++)
{
var prod = new Product
{
Name = "Product" + k,
Description = "Product for " + cat.Name,
Visible = true,
Categories = new List<Category>(new[] { cat })
};
cat.Products.Add(prod);
}
db.Save(cat);
}
}
這樣可以正確保存產品和類別,但不會保存連接表中的任何關系。 看看sql對category.Products的調用生成,它實際上是在查找產品的連接表(並且無法找到任何,因為它是空的)
任何幫助將不勝感激 :-)
編輯 :刪除了反向,問題仍在發生:(
編輯2 :
以下是目錄和產品的映射文件(注意:名稱有點愚蠢,但這只是一個快速的原型 - 這種交易)
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="property" auto-import="true" default-cascade="none" default-lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" name="FancyStore.Models.Catalog.Product, FancyStore, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="`Product`">
<id name="Id" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Id" />
<generator class="identity" />
</id>
<property name="Name" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Name" />
</property>
<property name="Description" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Description" />
</property>
<property name="Price" type="System.Decimal, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Price" />
</property>
<property name="Visible" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Visible" />
</property>
<bag cascade="all-delete-orphan" inverse="true" name="Categories" table="ProductsToCategories">
<key>
<column name="Product_id" />
</key>
<many-to-many class="FancyStore.Models.Catalog.Category, FancyStore, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
<column name="Category_id" />
</many-to-many>
</bag>
</class>
</hibernate-mapping>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="property" auto-import="true" default-cascade="none" default-lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" name="FancyStore.Models.Catalog.Category, FancyStore, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="`Category`">
<id name="Id" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Id" />
<generator class="identity" />
</id>
<property name="Name" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Name" />
</property>
<property name="Description" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Description" />
</property>
<property name="Visible" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Visible" />
</property>
<bag cascade="all-delete-orphan" name="Products" table="ProductsToCategories">
<key>
<column name="Category_id" />
</key>
<many-to-many class="FancyStore.Models.Catalog.Product, FancyStore, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
<column name="Product_id" />
</many-to-many>
</bag>
</class>
</hibernate-mapping>
我可能會弄錯,但看起來你把雙方的關系標記為“反向”。
您應該只為關系的一方執行此操作,並確保在另一方上調用Save
。
此外,我相信在保存之前雙方的關系必須是有效的(除了你已經在做的事情之外,將cat
添加到prod.Categories
)。
我對這些關系的理解無疑是模糊的,但這是我幾個月來的研究提出來的(並解決了我自己的一些問題)。
@Matt Briggs,我已經明白了。 您必須將一個關系設置為Inverse()並保存另一個實體,添加對兩個實體的引用(prod.Categories.Add()+ cat.Products.Add())並提交事務。 除非您提交連接表的查詢,否則不會生成。 - HeavyWave 5月13日12:43
你對關聯的錯誤方面有反過來。 反向意味着“另一方管理這種關聯”。
您需要的是刪除類別上的反轉並將其放在產品上,或將產品更改為“擁有”實體,如下所示:
//make sure to add it to BOTH sides of the association
product.Categories.Add(cat);
cat.Products.Add(product);
db.Save(cat); //if Product has Inverse
/* or */
db.Save(prod); //if Category has Inverse
如果要在自動化之前首先應用Product和Category的流暢映射,那該怎么辦? 例如,
public class Product
{
public virtual int Id { get; private set; }
public virtual string Name { get; set; }
public virtual string Description { get; set; }
public virtual decimal Price { get; set; }
public virtual bool Visible { get; set; }
public virtual IList<Category> Categories { get; set; }
public Product()
{
Categories = new List<Category>();
}
}
public class ProductMap : ClassMap<Product>
{
Id(x => x.Id);
Map(x => x.Name);
Map(x => x.Description);
Map(x => x.Price);
Map(x => x.Visible);
HasManyToMany(x => x.Categories)
.Table("ProductsToCategories")
.ParentKeyColumn("Product_id")
.ChildKeyColumn("Category_id")
.Cascade.AllDeleteOrphan();
}
public class Category
{
public virtual int Id { get; private set; }
public virtual string Name { get; set; }
public virtual string Description { get; set; }
public virtual bool Visible { get; set; }
public virtual IList<Product> Products { get; set; }
public Category()
{
Products = new List<Product>();
}
}
public class CategoryMap : ClassMap<Category>
{
Id(x => x.Id);
Map(x => x.Name);
Map(x => x.Description);
Map(x => x.Visible);
HasManyToMany(x => x.Products)
.Table("ProductsToCategories")
.ParentKeyColumn("Category_id")
.ChildKeyColumn("Product_id")
.Cascade.AllDeleteOrphan().Inverse();
}
配置,
public static void BuildFactory()
{
_factory = Fluently.Configure()
.Database(
MsSqlConfiguration
.MsSql2008
.ConnectionString(_connectionString)
.ShowSql()
)
.Mappings(m => {
m.FluentMappings.AddFromAssemblyOf<Database>();
m.AutoMappings.Add(
AutoMap.AssemblyOf<Database>()
.Where(t => t.Namespace == "FancyStore.Models.Catalog"));
})
.ExposeConfiguration(SetConfiguration)
.BuildConfiguration()
.BuildSessionFactory();
}
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