One-to-many relationships are used when a single entity is associated with any number of other entities. For example, aBlogcan have many associatedPosts, but eachPostis associated with only oneBlog. This document is structured around lots of examples. The examples start with common cases, which...
Optional one-to-one Required one-to-one with primary key to primary key relationship Required one-to-one with shadow foreign key Show 9 more One-to-one relationships are used when one entity is associated with at most one other entity. For example, a Blog has one BlogHeader, and tha...
EF supports many different types of relationships, with many different ways these relationships can be represented and configured. To jump into examples for different kinds of relationships, see: One-to-many relationships, in which a single entity is associated with any number of other entities. ...
This entity type has two FKs each associated with a navigation property one pointing to one side of the relationship (Post) and the other to the other side of the relationship (Tag). When we want to associate a Post with a Tag, we create a new PostTag instance and set the navigation ...
Joining relationships configuration (Dictionary) 想自己配置 Join entity type configuration 也是 ok 的. modelBuilder.Entity<Category>() .HasMany(e=>e.Products) .WithMany(e=>e.Categories) .UsingEntity<Dictionary<string,object>>( j=>j .HasOne<Product>() ...
Query Types in Relationships Notice the HasOne method. It’s possible for a query type to be a dependent (aka “child”) in a one-to-one or one-to-many relationship with an entity, although not with another query type. Also note that query types aren’t nearly as flexible as entities...
Currently in V5, you can configure a Many-to-Many relationship with an explicit join entity, or let one get created for you implicitly. Either way this will create an additional document in the database that represents this join in a man...
EF Core version: 5.0 According to the documentation: https://docs.microsoft.com/en-us/ef/core/modeling/relationships?tabs=fluent-api%2Cfluent-api-simple-key%2Csimple-key#many-to-many I have to define the intermediate entity of the many t...
EF Core 5.0 supports many-to-many relationships without explicitly mapping the join table. For example, consider these entity types: Copy public class Post { public int Id { get; set; } public string Name { get; set; } public ICollection<Tag> Tags { get; set; } } public class Tag {...
relationships: one-to-one, one-to-many, and many-to-many. In a one-to-many relationship, the foreign key is defined on the table that represents the many end of the relationship. The many-to-many relationship involves defining a third table (called a junction or join table), whose ...