我在 GraphDiff 附加具有递归多对多关系的对象时遇到问题。我正在使用 GraphDiff 2.0.1 和实体框架 6.1.1。
该程序管理可以具有 0-n 个 RecipeLines 的食谱，其中包含指向另一个食谱的链接，该食谱是 ComponentRecipe，并且具有 RecipeLines 等等。
我将一个配方对象传递到具有 1 个配方行的存储库中，该行上的配方对象指向父级，而 ComponentRecipe 对象指向不同的配方。
当 GraphDiff 附加项目时，它返回的附加项目有 2 条配方行，它们都是相同的，并且 ComponentRecipe 指向与在自身上创建循环的配方相同的对象。
我不确定这是否是 GraphDiff 的问题，或者更可能是我的 EF 映射或 GraphDiff 映射有问题。任何帮助表示赞赏，如果您需要更多信息，请告诉我，我可以提供一个简单的程序来演示此问题。
领域模型
public class Recipe : EntityBase
{
public override object Key
{
get { return Id; }
}
public int Id { get; set; }
public string Name { get; set; }
public virtual IList<RecipeLine> RecipeLines { get; set; }
}
public class RecipeLine : EntityBase
{
public override object Key
{
get { return Id; }
}
public int Id { get; set; }
public int RecipeId { get; set; }
public int ComponentRecipeId { get; set; }
public decimal Quantity { get; set; }
public virtual Recipe Recipe { get; set; }
public virtual Recipe ComponentRecipe { get; set; }
}
数据上下文
class DataContext : DbContext
{
public DataContext()
: base("Connection")
{
Configuration.ProxyCreationEnabled = false;
Configuration.LazyLoadingEnabled = false;
}
public DbSet<Recipe> Recipes { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
Database.SetInitializer<DataContext>(null);
modelBuilder.Entity<Recipe>().ToTable("Recipes");
modelBuilder.Entity<Recipe>().HasKey(x => x.Id);
modelBuilder.Entity<Recipe>().Property(x => x.Id).HasColumnName("Id");
modelBuilder.Entity<Recipe>().Property(x => x.Name).HasColumnName("Name");
modelBuilder.Entity<RecipeLine>().ToTable("RecipeLines");
modelBuilder.Entity<RecipeLine>().HasKey(x => x.Id);
modelBuilder.Entity<RecipeLine>().Property(x => x.Id).HasColumnName("Id");
modelBuilder.Entity<RecipeLine>().Property(x => x.RecipeId).HasColumnName("RecipeId");
modelBuilder.Entity<RecipeLine>().Property(x => x.ComponentRecipeId).HasColumnName("ComponentRecipeId");
modelBuilder.Entity<RecipeLine>().Property(x => x.Quantity).HasColumnName("Quantity").HasPrecision(18, 5);
modelBuilder.Entity<Recipe>().HasMany(x => x.RecipeLines).WithRequired(x => x.Recipe).HasForeignKey(x => x.RecipeId);
modelBuilder.Entity<RecipeLine>().HasRequired(x => x.ComponentRecipe).WithMany().HasForeignKey(x => x.ComponentRecipeId);
}
}
存储库
public override void UpdateEntity(IEntity entity)
{
using (var context = new DataContext())
{
context.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);
var item = (Recipe)entity;
var attachedItem = context.UpdateGraph(item,
a => a.OwnedCollection(b => b.RecipeLines, c => c.AssociatedEntity(d => d.ComponentRecipe)));
context.SaveChanges();
}
}
附加数据上下文日志
Opened connection at 14/09/2014 16:57:06 +01:00
SELECT
[Project1].[Id] AS [Id],
[Project1].[Name] AS [Name],
[Project1].[C1] AS [C1],
[Project1].[Id1] AS [Id1],
[Project1].[RecipeId] AS [RecipeId],
[Project1].[ComponentRecipeId] AS [ComponentRecipeId],
[Project1].[Quantity] AS [Quantity],
[Project1].[Id2] AS [Id2],
[Project1].[Name1] AS [Name1]
FROM ( SELECT
[Limit1].[Id] AS [Id],
[Limit1].[Name] AS [Name],
[Join1].[Id1] AS [Id1],
[Join1].[RecipeId] AS [RecipeId],
[Join1].[ComponentRecipeId] AS [ComponentRecipeId],
[Join1].[Quantity] AS [Quantity],
[Join1].[Id2] AS [Id2],
[Join1].[Name] AS [Name1],
CASE WHEN ([Join1].[Id1] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1]
FROM (SELECT TOP (2) [Extent1].[Id] AS [Id], [Extent1].[Name] AS [Name]
FROM [dbo].[Recipes] AS [Extent1]
WHERE 11 = [Extent1].[Id] ) AS [Limit1]
LEFT OUTER JOIN (SELECT [Extent2].[Id] AS [Id1], [Extent2].[RecipeId] AS [RecipeId], [Extent2].[ComponentRecipeId] AS [ComponentRecipeId], [Extent2].[Quantity] AS [Quantity], [Extent3].[Id] AS [Id2], [Extent3].[Name] AS [Name]
FROM [dbo].[RecipeLines] AS [Extent2]
INNER JOIN [dbo].[Recipes] AS [Extent3] ON [Extent2].[ComponentRecipeId] = [Extent3].[Id] ) AS [Join1] ON [Limit1].[Id] = [Join1].[RecipeId]
) AS [Project1]
ORDER BY [Project1].[Id] ASC, [Project1].[C1] ASC
-- Executing at 14/09/2014 16:57:06 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 14/09/2014 16:57:06 +01:00
Opened connection at 14/09/2014 16:57:07 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Name] AS [Name]
FROM [dbo].[Recipes] AS [Extent1]
WHERE [Extent1].[Id] = 10
-- Executing at 14/09/2014 16:57:07 +01:00
-- Completed in 0 ms with result: SqlDataReader
Closed connection at 14/09/2014 16:57:07 +01:00
SaveChanges 上的数据上下文日志
Opened connection at 14/09/2014 16:58:45 +01:00
INSERT [dbo].[RecipeLines]([RecipeId], [ComponentRecipeId], [Quantity])
VALUES (@0, @1, @2)
SELECT [Id]
FROM [dbo].[RecipeLines]
WHERE @@ROWCOUNT > 0 AND [Id] = scope_identity()
-- @0: '11' (Type = Int32)
-- @1: '11' (Type = Int32)
-- @2: '1' (Type = Decimal, Precision = 18, Scale = 5)
-- Executing at 14/09/2014 16:58:46 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 14/09/2014 16:58:46 +01:00