EFコアのSQLiteプロバイダで多対多のリレーションシップを作成できません

Question

EFコアを試してみて、SQLiteをプロバイダとして試してみることにしました。私はインターネット上のいくつかの指示に従って、またthis topicをstackoverflowのフィードから考えました。どういうわけか私は多くのテーブルを作成することはありません。私はそれがテーブルのユーザー、グループを生成していない初期の移行を開始するいくつかの理由で

public class BloggingContext : DbContext 
    { 
     public DbSet<Blog> Blogs { get; set; } 
     public DbSet<Post> Posts { get; set; } 
     public DbSet<User> Users { get; set; } 
     public DbSet<Group> Groups { get; set; } 

     protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) 
     { 
      optionsBuilder.UseSqlite("Filename=./Blogging.db"); 
     } 

     protected override void OnModelCreating(ModelBuilder modelBuilder) 
     { 
      modelBuilder.Entity<UserGroup>().HasKey(x => new { x.UserId, x.GroupId }); 

      modelBuilder.Entity<UserGroup>() 
       .HasOne(pc => pc.User) 
       .WithMany(p => p.UserGroups) 
       .HasForeignKey(pc => pc.UserId); 

      modelBuilder.Entity<UserGroup>() 
       .HasOne(pc => pc.Group) 
       .WithMany(c => c.UserGroups) 
       .HasForeignKey(pc => pc.GroupId); 
     } 
    } 

    public class Blog 
    { 
     public int BlogId { get; set; } 
     public string Url { get; set; } 

     public List<Post> Posts { get; set; } 
    } 

    public class Post 
    { 
     public int PostId { get; set; } 
     public string Title { get; set; } 
     public string Content { get; set; } 

     public int MadeBy { get; set; } 

     public int BlogId { get; set; } 
     public Blog Blog { get; set; } 
    } 

    public class User 
    { 
     [Key] 
     public int Id { get; set; } 

     public ICollection<UserGroup> UserGroups { get; set; } 
    } 

    public class Group 
    { 
     [Key] 
     public int Id { get; set; } 

     public ICollection<UserGroup> UserGroups { get; set; } 
    } 

    // Needed for many-to-many https://stackoverflow.com/questions/29442493/how-to-create-a-many-to-many-relationship-with-latest-nightly-builds-of-ef-core 
    public class UserGroup 
    { 
     [ForeignKey("User")] 
     public int UserId { get; set; } 
     public User User { get; set; } 

     [ForeignKey("Group")] 
     public int GroupId { get; set; } 
     public Group Group { get; set; } 
    } 

：

これは私のDbContextファイルがどのように見えるかです。これは、移行プロセスからのログ：あなたが見ることができるように

$ dotnet ef database update 
Project ConsoleApp.SQLiteVS (.NETCoreApp,Version=v1.1) was previously compiled. Skipping compilation. 
Executed DbCommand (4ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
PRAGMA foreign_keys=ON; 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
PRAGMA foreign_keys=ON; 
Executed DbCommand (35ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE TABLE "__EFMigrationsHistory" (
    "MigrationId" TEXT NOT NULL CONSTRAINT "PK___EFMigrationsHistory" PRIMARY KEY, 
    "ProductVersion" TEXT NOT NULL 
); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
PRAGMA foreign_keys=ON; 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
PRAGMA foreign_keys=ON; 
Executed DbCommand (2ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
SELECT COUNT(*) FROM "sqlite_master" WHERE "name" = '__EFMigrationsHistory' AND "type" = 'table'; 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
PRAGMA foreign_keys=ON; 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
SELECT "MigrationId", "ProductVersion" 
FROM "__EFMigrationsHistory" 
ORDER BY "MigrationId"; 
Applying migration '20170117155520_MyFirstMigration'. 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
PRAGMA foreign_keys=ON; 
Executed DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE TABLE "Blogs" (
    "BlogId" INTEGER NOT NULL CONSTRAINT "PK_Blogs" PRIMARY KEY AUTOINCREMENT, 
    "Url" TEXT 
); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE TABLE "Groups" (
    "Id" INTEGER NOT NULL CONSTRAINT "PK_Groups" PRIMARY KEY AUTOINCREMENT 
); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE TABLE "Users" (
    "Id" INTEGER NOT NULL CONSTRAINT "PK_Users" PRIMARY KEY AUTOINCREMENT 
); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE TABLE "Posts" (
    "PostId" INTEGER NOT NULL CONSTRAINT "PK_Posts" PRIMARY KEY AUTOINCREMENT, 
    "BlogId" INTEGER NOT NULL, 
    "Content" TEXT, 
    "MadeBy" INTEGER NOT NULL, 
    "Title" TEXT, 
    CONSTRAINT "FK_Posts_Blogs_BlogId" FOREIGN KEY ("BlogId") REFERENCES "Blogs" ("BlogId") ON DELETE CASCADE 
); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE TABLE "UserGroup" (
    "UserId" INTEGER NOT NULL, 
    "GroupId" INTEGER NOT NULL, 
    CONSTRAINT "PK_UserGroup" PRIMARY KEY ("UserId", "GroupId"), 
    CONSTRAINT "FK_UserGroup_Groups_GroupId" FOREIGN KEY ("GroupId") REFERENCES "Groups" ("Id") ON DELETE CASCADE, 
    CONSTRAINT "FK_UserGroup_Users_UserId" FOREIGN KEY ("UserId") REFERENCES "Users" ("Id") ON DELETE CASCADE 
); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE INDEX "IX_Posts_BlogId" ON "Posts" ("BlogId"); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
CREATE INDEX "IX_UserGroup_GroupId" ON "UserGroup" ("GroupId"); 
Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] 
INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion") 
VALUES ('20170117155520_MyFirstMigration', '1.1.0-rtm-22752'); 
Done. 

、テーブルが作成されますように見えるが、私はFirefox'es DB ManagerとのDBファイルを開いたとき、私はのみ作成投稿やブログの表を参照してくださいすることができます。

どうすれば修正できますか？

Answer 1

現在、あなたは多くのテーブルに自分を多くのレコード生成する必要があります。https://docs.microsoft.com/en-us/ef/core/modeling/relationships#many-to-many

それは、将来のバージョンのためのロードマップである：https://github.com/aspnet/EntityFramework/wiki/Roadmap