DDD ValueObjects的EntityFramework命名约定 [英] EntityFramework naming conventions for DDD ValueObjects

问题描述

我在项目中使用域驱动设计模式.我有一些 ValueObjects ，例如 PersianDate 具有长型属性.数据库中ValueObject属性的名称为CreatedOn_PersianDate，但我希望其名称为CreatedOn.我可以直接更改此属性，但是如何通过惯例进行更改? (FixOValueObjectAttributeConvention)

I use Domain Driven Design Pattern in my project. I have some ValueObjects like PersianDate that has a long type property. the name of ValueObject property in database be CreatedOn_PersianDate but I want its name be CreatedOn. I can change this property directly but how can i do it by conventions? (FixOValueObjectAttributeConvention)

public class PersianDate : ValueObject<PersianDate>
{
    public long Value {get; set;}
}

public class Account : Entity
{
    public int Id {get; set;}
    public PersianDate CreatedOn {get; set;}
}

public class TestContext : DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Add(new FixObjectValueAttributeConvention());
        base.OnModelCreating(modelBuilder);
    }
}

推荐答案

您可能已经注意到EF的复杂类型属性命名约定是

You probably noticed that EF's naming convention for properties in complex types is

Property name + "_" + Property name in complex type

因此，默认情况下，CreatedOn将映射为CreatedOn_Value. (据我所知，并不是您提到的名称CreatedOn_PersianDate，但这对后面的内容并不重要).

So by default, CreatedOn will be mapped as CreatedOn_Value. (As far as I can see, not the name CreatedOn_PersianDate that you mention, but it doesn't really matter for what follows).

您可以创建一个自定义代码优先约定来进行修改.我向您展示了一个约定，该约定删除了long(bigint)类型的每个属性的"_Value"后缀:

You can create a custom code-first convention to modify this. I show you a convention that removes this "_Value" suffix for each property of type long (bigint):

class PersionDateNamingConvention : IStoreModelConvention<EdmProperty>
{
    public void Apply(EdmProperty property, DbModel model)
    {
        if (property.TypeName == "bigint" && property.Name.EndsWith("_Value"))
        {
            property.Name = property.Name.Replace("_Value", string.Empty);
        }
    }
}

当然，可以根据需要应用此约定时对条件进行微调.

Of course you can fine-tune the conditions when this convention is applied as needed.

您必须将此约定添加到模型构建器(在OnModelCreating中)以使其生效:

You have to add this convention to the model builder (in OnModelCreating) to make it effective:

modelBuilder.Conventions.Add(new PersionDateNamingConvention());

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