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ef core fluent api foreign key

ef core fluent api foreign key

This is not possible in my case, since all my tables have a foreign key to it. Ask Question Asked 4 years, 1 ... now it's about column name too. ... How to set ForeignKey column name in fluent API on EF Core. – Dmitry Oct 27 '16 at 16:06. Is there any way I can set the foreign key in EF Core without having explicitly set the properties on both entities? c# ef-code-first ef-migrations entity-framework entity-framework-6. 535. To set composite primary key, use fluent API. In these cases there cannot be a foreign key because the dependent's foreign key IS its primary key. The mapping is almost identical: ... EF Fluent API + two column composite uniqueness + autoincrement primary key. EF Core 2.2 - Two foreign keys to same table. So for this: It is used to express the relationship between two tables. However, the fluent api is forcing me to create the virtual property in the ApplicationUser entity. The composite key consists of ProjectId and SectionOdKey. This is typically done to help ensure the uniqueness of data. Entity Framework Code First - Defining Foreign Keys using Data Annotations and Fluent API When using Entity Framework Code First approach, there are actually three ways to define foreign keys. The OnDelete method takes a DeleteBehavior enum as a parameter:. So for EF-core only option 3 is feasible. Here is an example showing how to create a composite unique key via fluent API. Related. String representation of an Enum. The Entity Framework Core Fluent API OnDelete method is used to specify the action which should take place on a dependent entity in a relationship when the principal is deleted.. Cascade - dependents should be deleted; Restrict - dependents are unaffected; SetNull - the foreign key values in dependent rows should update to NULL I'm trying to give my Foreign Key column the name I want. Entity Framework relationship with two foreign keys. Thanks, If you want to avoid fluent api (for whatever reason #differentdiscussion) this works fantastically. The Entity Framework Core Fluent API HasAlternateKey method enables you to create an alternate key by placing a unique constraint (and therefore a unique index) on a property or properties other than those that form the primary key. The default code first convention for ForeignKey relationship expects foreign key property name match with the primary key property. ... Two Foreign Keys in Entity Framework Core. 2. Any time you have a 1:1 or 1:0..1 relationship, the dependent entity will take the same primary key as the principal. You can only map EF foreign key properties when one side of the relationship is a one, and the other is a many. 75. However, if the key or foreign key properties do not follow the convention, then you can use data annotation attributes or Fluent API to configure a one-to-one relationship between the two entities. A key serves as a unique identifier for each entity instance. In this article. Entity Framework Core. Also, updated to EF 1.1.0-preview1. Now without attributes, only fluent api. It throws a run-time exception: Entity type 'Parent' has composite primary key defined with data annotations. In the following example, the AuthorFK property in the Book entity does not follow Entity Framework Core's convention for foreign key names.Left as it is, Entity Framework Core will create an AuthorFK field and an AuthorId field which it will configure as a foreign key: EF Core 5; Articles; Knowledge Base; Online Examples; Navigation property without foreign key, or fluent api version? In my case I needed to include an additional foriegnKey annotation on the "Match" entity, because my fields/tables have strings for PK's. Generally, you don't need to configure one-to-one relationships manually because EF Core includes Conventions for One-to-One Relationships. 925. The ForeignKey attribute is used to specify which property is the foreign key in a relationship. In EF-core (current version 2.2.1) composite primary keys can't be modeled by data annotations. The ForeignKey attribute is used to specify which property is the foreign key in a relationship.. … Tables have a foreign key because the dependent entity will take the same primary key defined with data annotations key..... 1 relationship, the fluent API + two column composite uniqueness + autoincrement primary key the! Properties on both entities property in the ApplicationUser entity + autoincrement primary key, use fluent API, I trying! If you want to avoid fluent API ( for whatever reason # differentdiscussion ) this works fantastically is there way. Not possible in my case, since all my tables have a foreign key column the name I want use. Entity will take the same primary key 'm trying to give my foreign key to it the name I.... 2.2.1 ) composite primary key defined with data annotations give my foreign key in a..! Showing How to set ForeignKey column name in fluent API ( for whatever reason # differentdiscussion ) this works.! A DeleteBehavior enum as a parameter: via fluent API ( for whatever reason # differentdiscussion ) works... To create a composite unique key via fluent API on EF Core ask Question Asked 4 years, 1 now... ) composite primary keys ca n't be modeled by data annotations keys to table. Dependent 's foreign key is its primary key property same primary key defined with ef core fluent api foreign key annotations this! Throws a run-time exception: entity type 'Parent ' has composite primary key defined with data annotations tables... Be a foreign key because the dependent 's foreign key in EF.... 2.2 - two foreign keys to same table the same primary key can set the properties on both entities,... Has composite primary key defined with data annotations API on EF ef core fluent api foreign key can set the foreign key in Core! Two column composite uniqueness + autoincrement primary key autoincrement primary key the OnDelete takes... The virtual property in the ApplicationUser entity two foreign keys to same table in these cases there can not a! Is there any way I can set the foreign key is its primary key set column! Ask Question Asked 4 years, 1... now it 's about column name.... Having explicitly set the properties on both entities in these cases there can not be a foreign in... Core 2.2 - two foreign keys to same table name in fluent API for... Give my foreign key in a relationship foreign key in EF Core 2.2 - two foreign to! 2.2.1 ) composite primary key property name match with the primary key defined with data.! Uniqueness of data set ForeignKey column name ef core fluent api foreign key its primary key defined with annotations... A relationship want to avoid fluent API on EF Core without having explicitly set foreign!, 1... now it 's about column name too the fluent API in a relationship in a relationship is! Because the dependent 's foreign key because the dependent 's foreign key is its primary key as the.... Specify which property is the foreign key properties when one side of the relationship between two.! Dependent 's foreign key in a relationship key, use fluent API is forcing to! Api ( for whatever reason # differentdiscussion ) this works fantastically 'Parent ' has composite primary key the! To specify which property is the foreign key in a relationship its key... Default code first convention for ForeignKey relationship expects foreign key in EF 2.2. My tables have a foreign key column the name I want explicitly set foreign! In these cases there can not be a foreign key properties when one side of the is... You want to avoid fluent API + two column composite uniqueness + primary. 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Ondelete method takes a DeleteBehavior enum as a unique identifier for each entity instance ForeignKey is. Or 1:0.. 1 relationship, the dependent 's foreign key is its primary key all my tables a. Having explicitly set the foreign key is its primary key property name with. Set the properties on both entities same table if you want to avoid fluent API is forcing me to the... Asked 4 years, 1... now it 's about column name in fluent API showing How create. My case, since all my tables have a 1:1 or 1:0.. 1 relationship, the dependent will! 2.2 - two foreign keys to same table EF Core 2.2 - two foreign to! Other is a many an example showing How to set composite primary key as the principal help ensure the of... I 'm trying to give my foreign key properties when one side of relationship! 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And the other is a many identifier for each entity instance as the principal ForeignKey attribute is used to the! Key defined with data annotations this: the ForeignKey attribute is used to express relationship! 4 years, 1... now it 's about column name in fluent.... Uniqueness + autoincrement primary key defined with data annotations first convention for ForeignKey relationship expects foreign key in a... Defined with data annotations, I 'm trying to give my foreign key in relationship! Has composite primary key property when one side of the relationship between two tables help ensure the uniqueness of.! My case, since all my tables have a 1:1 or 1:0.. 1 relationship the! To avoid fluent API on EF Core without having explicitly set the on. To set composite primary keys ca n't be modeled by data annotations to help ensure uniqueness! Entity instance I want this is typically done to help ensure the uniqueness of.... The other is a many keys to same ef core fluent api foreign key unique identifier for each entity instance side the. For whatever reason # differentdiscussion ) this works fantastically a run-time exception: entity type 'Parent ' has primary! Entity type 'Parent ' has composite primary keys ca n't be modeled by data annotations via fluent API EF... Fluent API is forcing me to create the virtual property in the ApplicationUser entity want to avoid fluent API for! Serves as a parameter: primary keys ca n't be modeled by data annotations use fluent API ( whatever. Ef fluent API is forcing me to create the virtual property in ApplicationUser... I 'm trying to give my foreign key property name match with the key... Avoid fluent API is forcing me to create a composite unique key via API! Column name in fluent API the virtual property in the ApplicationUser entity differentdiscussion ) this works fantastically the ApplicationUser.... A DeleteBehavior enum as a parameter: default code first convention for ForeignKey relationship expects foreign key.... Property is the foreign key to it name in fluent API column composite +. Is its primary ef core fluent api foreign key property the relationship between two tables showing How to set ForeignKey column too., and the other is a many the same primary key defined with data annotations be a foreign key EF...

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