[英]Error with many-to-many relationship in Entity Framework Core
I'm trying to achieve the Following scheme with EF Core.我正在尝试使用 EF Core 实现以下方案。
Here is my class这是我的 class
public class User
{
this.Id = Guid.NewGuid().ToString();
public ICollection<User> Followers { get; set; } = new List<User>();
public ICollection<User> Following { get; set; } = new List<User>();
}
Here is my configuration这是我的配置
using Microsoft.EntityFrameworkCore;使用 Microsoft.EntityFrameworkCore; using Microsoft.EntityFrameworkCore.Metadata.Builders;使用 Microsoft.EntityFrameworkCore.Metadata.Builders;
public class UserConfiguration : IEntityTypeConfiguration<User>
{
public void Configure(EntityTypeBuilder<User> builder)
{
builder
.HasMany(m => m.Followers)
.WithMany(m => m.Following)
.Map(x => x.MapLeftKey("UserId")
.MapRightKey("FollowerId")
.ToTable("UserFollowers"));
}
}
Here is Error:这是错误:
Severity Code Description Project File Line Suppression State Error CS1061 'CollectionNavigationBuilder<User, User>' does not contain a definition for 'WithMany' and no accessible extension method 'WithMany' accepting a first argument of type 'CollectionNavigationBuilder<User, User>' could be found (are you missing a using directive or an assembly reference?) Gapped.Entities E:\Projects\Generic\GappedProfileAPI\GappedBaseAPI-skeleton\Gapped.Entities\Models\Configurations\Users\UserConfiguration.cs 50 Active严重性代码说明项目文件行抑制 State 错误 CS1061“CollectionNavigationBuilder<User, User>”不包含“WithMany”的定义,并且没有可访问的扩展方法“WithMany”接受类型为“CollectionNavigationBuilder<User, User>”的第一个参数找到(是否缺少 using 指令或程序集引用?)Gapped.Entities E:\Projects\Generic\GappedProfileAPI\GappedBaseAPI-skeleton\Gapped.Entities\Models\Configurations\Users\UserConfiguration.cs 50 活动
EF Core doesn't (yet) support automatic many to many relationships. EF Core(目前)不支持自动多对多关系。 You have to provide the link table between the 2 ends:您必须提供两端之间的链接表:
public class User
{
this.Id = Guid.NewGuid().ToString();
public ICollection<Follower> Followers { get; set; } = new List<Follower>();
public ICollection<Follower> Following { get; set; } = new List<Follower>();
}
public class Follower
{
public User User {get;set;}
public User Follower {get;set;}
}
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