我在VS 2017（版本15.5）中创建了一个新的ASP.NET Core 2 MVC项目，将用户ID类型从字符串更改为Guid（也将ApplicationUser类名更改为User），添加了我的模型然后
Add-Migration Init
Update-Database
但它会产生错误，数据库不会被创建。
The object 'PK_AspNetUserTokens' is dependent on column 'UserId'.
ALTER TABLE ALTER COLUMN UserId failed because one or more objects access this column.
这是我的背景：
public class ApplicationDbContext : IdentityDbContext<User, IdentityRole<Guid>, Guid>
{
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
: base(options)
{
}
public DbSet<TvShow> TvShows { get; set; }
public DbSet<Episode> Episodes { get; set; }
public DbSet<Subscription> Subscriptions { get; set; }
public DbSet<Notification> Notifications { get; set; }
public DbSet<Genre> Genres { get; set; }
public DbSet<TvShowGenre> TvShowGenre { get; set; }
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.Entity<Subscription>()
.HasKey(c => new { c.TvShowId, c.UserId });
builder.Entity<TvShowGenre>()
.HasKey(c => new { c.TvShowId, c.GenreId });
}
}
这是我的迁移类（只有up方法）：
public partial class Init : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropIndex(
name: "UserNameIndex",
table: "AspNetUsers");
migrationBuilder.DropIndex(
name: "IX_AspNetUserRoles_UserId",
table: "AspNetUserRoles");
migrationBuilder.DropIndex(
name: "RoleNameIndex",
table: "AspNetRoles");
migrationBuilder.AlterColumn<Guid>(
name: "UserId",
table: "AspNetUserTokens",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.AlterColumn<Guid>(
name: "Id",
table: "AspNetUsers",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.AlterColumn<Guid>(
name: "RoleId",
table: "AspNetUserRoles",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.AlterColumn<Guid>(
name: "UserId",
table: "AspNetUserRoles",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.AlterColumn<Guid>(
name: "UserId",
table: "AspNetUserLogins",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.AlterColumn<Guid>(
name: "UserId",
table: "AspNetUserClaims",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.AlterColumn<Guid>(
name: "Id",
table: "AspNetRoles",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.AlterColumn<Guid>(
name: "RoleId",
table: "AspNetRoleClaims",
nullable: false,
oldClrType: typeof(string));
migrationBuilder.CreateTable(
name: "Genres",
columns: table => new
{
Id = table.Column<long>(nullable: false)
.Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
Genres = table.Column<int>(nullable: false),
IsFirst = table.Column<bool>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Genres", x => x.Id);
});
migrationBuilder.CreateTable(
name: "Notifications",
columns: table => new
{
Id = table.Column<long>(nullable: false)
.Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
CreateDate = table.Column<DateTime>(nullable: false),
Message = table.Column<string>(nullable: true),
Seen = table.Column<bool>(nullable: false),
UserId = table.Column<Guid>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Notifications", x => x.Id);
table.ForeignKey(
name: "FK_Notifications_AspNetUsers_UserId",
column: x => x.UserId,
principalTable: "AspNetUsers",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "TvShows",
columns: table => new
{
Id = table.Column<long>(nullable: false)
.Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
ProductionYear = table.Column<string>(nullable: true),
Status = table.Column<int>(nullable: false),
Title = table.Column<string>(nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_TvShows", x => x.Id);
});
migrationBuilder.CreateTable(
name: "Episodes",
columns: table => new
{
Id = table.Column<long>(nullable: false)
.Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
BroadcastDate = table.Column<DateTime>(nullable: true),
Duration = table.Column<TimeSpan>(nullable: true),
Number = table.Column<int>(nullable: true),
Season = table.Column<string>(nullable: true),
Title = table.Column<string>(nullable: true),
TvShowId = table.Column<long>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Episodes", x => x.Id);
table.ForeignKey(
name: "FK_Episodes_TvShows_TvShowId",
column: x => x.TvShowId,
principalTable: "TvShows",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "Subscriptions",
columns: table => new
{
TvShowId = table.Column<long>(nullable: false),
UserId = table.Column<Guid>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Subscriptions", x => new { x.TvShowId, x.UserId });
table.ForeignKey(
name: "FK_Subscriptions_TvShows_TvShowId",
column: x => x.TvShowId,
principalTable: "TvShows",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
table.ForeignKey(
name: "FK_Subscriptions_AspNetUsers_UserId",
column: x => x.UserId,
principalTable: "AspNetUsers",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "TvShowGenre",
columns: table => new
{
TvShowId = table.Column<long>(nullable: false),
GenreId = table.Column<long>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_TvShowGenre", x => new { x.TvShowId, x.GenreId });
table.ForeignKey(
name: "FK_TvShowGenre_Genres_GenreId",
column: x => x.GenreId,
principalTable: "Genres",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
table.ForeignKey(
name: "FK_TvShowGenre_TvShows_TvShowId",
column: x => x.TvShowId,
principalTable: "TvShows",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateIndex(
name: "UserNameIndex",
table: "AspNetUsers",
column: "NormalizedUserName",
unique: true,
filter: "[NormalizedUserName] IS NOT NULL");
migrationBuilder.CreateIndex(
name: "RoleNameIndex",
table: "AspNetRoles",
column: "NormalizedName",
unique: true,
filter: "[NormalizedName] IS NOT NULL");
migrationBuilder.CreateIndex(
name: "IX_Episodes_TvShowId",
table: "Episodes",
column: "TvShowId");
migrationBuilder.CreateIndex(
name: "IX_Notifications_UserId",
table: "Notifications",
column: "UserId");
migrationBuilder.CreateIndex(
name: "IX_Subscriptions_UserId",
table: "Subscriptions",
column: "UserId");
migrationBuilder.CreateIndex(
name: "IX_TvShowGenre_GenreId",
table: "TvShowGenre",
column: "GenreId");
migrationBuilder.AddForeignKey(
name: "FK_AspNetUserTokens_AspNetUsers_UserId",
table: "AspNetUserTokens",
column: "UserId",
principalTable: "AspNetUsers",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
}
}
答案 0 :(得分：0)
我遇到了和你一样的问题。我删除了我的文件夹“Migration”并再次添加了迁移。由于先前的迁移更改，无法相应地创建FK。
答案 1 :(得分：0)
您必须回滚迁移，直到最后一次成功。对每次失败的迁移使用dotnet ef migrations remove命令。
答案 2 :(得分：0)
在更改DbContext身份架构时，我遇到了该错误。检查AspNetUserTokens表后，它的PK由3列组成。我做了以下解决方法：
丢弃AspNetUserTokens的PK：
ALTER TABLE AspNetUserTokens DROP CONSTRAINT PK_AspNetUserTokens
您可能在AspNetUserLogins上再次遇到该错误，因此此表也是如此：
ALTER TABLE AspNetUserLogins DROP CONSTRAINT PK_AspNetUserLogins
然后update-database希望是Done.
最后，重新添加PK：
ALTER TABLE AspNetUserLogins ADD CONSTRAINT PK_AspNetUserLogins PRIMARY KEY (LoginProvider,ProviderKey)
ALTER TABLE AspNetUserTokens ADD CONSTRAINT PK_AspNetUserTokens PRIMARY KEY ([UserId],[LoginProvider],[Name])
答案 3 :(得分：0)
在新的迁移中，只需在更改列之前放下键，然后再添加相同的键即可。
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropPrimaryKey("PK_AspNetUserTokens", "AspNetUserTokens");
migrationBuilder.DropPrimaryKey("PK_AspNetUserLogins", "AspNetUserLogins");
...
migrationBuilder.AlterColumn<string>(...);
...
migrationBuilder.AddPrimaryKey("PK_AspNetUserTokens", "AspNetUserTokens", new string[] { "UserId", "LoginProvider", "Name" });
migrationBuilder.AddPrimaryKey("PK_AspNetUserLogins", "AspNetUserLogins", new string[] { "LoginProvider", "ProviderKey" });
}