实体框架代码优先 - 非主键字段的外键

Question

I have two tables that look like this:

dbo.ReviewType
    ReviewTypeId INT PRIMARY KEY
    ShortName CHAR(1) - Unique Index
    Description

dbo.Review
   ReviewId INT PRIMARY KEY
   ReviewType_ShortName CHAR(1) - FK to ReviewType
   ...

A Review always has a ReviewType.
A ReviewType can be associated with many reviews.

I'm having trouble mapping this in Entity Framework using the Code First Fluent API. It seems like it does not like me using a foreign key that doesn't map to the Primary Key. I'm using a foreign key to a Unique Constraint/Index instead of to the Primary Key.

How can I map this properly in Entity Framework using C#?

I should note that the way I am doing it right now is giving me this error:

System.Data.Edm.EdmAssociationConstraint: : The types of all properties in the Dependent Role of a referential constraint must be the same as the corresponding property types in the Principal Role. The type of property 'ReviewTypeCode' on entity Review' does not match the type of property 'Id' on entity 'ReviewType' in the referential constraint 'ReviewType_Reviews'.

Answer 1

当前版本的EF不支持唯一索引，也不能基于非主要唯一键映射关系。