.net - EF Core Migration 重新创建重命名的表
问题描述
我正在使用 .NET 5 Identity 包并将其重命名为表,并使用了 .NET 的扩展名IdentityUser
。现在我决定向我添加一些属性User
并应用迁移,但迁移尝试重新创建我重命名的表。
这是我的用户模型:
public class User : IdentityUser<int>, IUser
{
public string Password { get; set; }
public string Username { get => base.UserName; set => base.UserName = value; }
public string Name { get; set; }
public bool PubliclyVisible { get; set; } //New
public IEnumerable<User> Trackers { get; set; } //New
public IEnumerable<User> Tracked { get; set; } //New
}
我的DbContext
扩展模型配置:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<User>(b =>
{
b.ToTable("Users");
b.HasMany(b => b.Tracked); //New
b.HasMany(b => b.Trackers); //New
b.Ignore(u => u.Username);
});
modelBuilder.Entity<GPSData>().HasOne(d => d.User);
modelBuilder.Entity<IdentityUserClaim<int>>(b => b.ToTable("UserClaims"));
modelBuilder.Entity<IdentityUserLogin<int>>(b => b.ToTable("UserLogins"));
modelBuilder.Entity<IdentityUserToken<int>>(b => b.ToTable("UserTokens"));
modelBuilder.Entity<IdentityRole>(b => b.ToTable("Roles"));
modelBuilder.Entity<IdentityRoleClaim<int>>(b => b.ToTable("RoleClaims"));
modelBuilder.Entity<IdentityUserRole<int>>(b => b.ToTable("UserRoles"));
}
我用 . 标记了我的新属性User
以及配置中的其他行//New
。
我跑之后add-migration AddedTrackingProperties
我得到以下迁移尝试重新创建我的表,因此AspNetUserRoles
当我更新表时我得到一个已经存在的错误。
迁移配置
public partial class AddedTrackingProperties : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.CreateTable(
name: "AspNetRoles",
columns: table => new
{
Id = table.Column<int>(type: "int", nullable: false)
.Annotation("SqlServer:Identity", "1, 1"),
Name = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: true),
NormalizedName = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: true),
ConcurrencyStamp = table.Column<string>(type: "nvarchar(max)", nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_AspNetRoles", x => x.Id);
});
migrationBuilder.CreateTable(
name: "Roles",
columns: table => new
{
Id = table.Column<string>(type: "nvarchar(450)", nullable: false),
Name = table.Column<string>(type: "nvarchar(max)", nullable: true),
NormalizedName = table.Column<string>(type: "nvarchar(max)", nullable: true),
ConcurrencyStamp = table.Column<string>(type: "nvarchar(max)", nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_Roles", x => x.Id);
});
migrationBuilder.CreateTable(
name: "Users",
columns: table => new
{
Id = table.Column<int>(type: "int", nullable: false)
.Annotation("SqlServer:Identity", "1, 1"),
Password = table.Column<string>(type: "nvarchar(max)", nullable: true),
Name = table.Column<string>(type: "nvarchar(max)", nullable: true),
PubliclyVisible = table.Column<bool>(type: "bit", nullable: false),
UserName = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: true),
NormalizedUserName = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: true),
Email = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: true),
NormalizedEmail = table.Column<string>(type: "nvarchar(256)", maxLength: 256, nullable: true),
EmailConfirmed = table.Column<bool>(type: "bit", nullable: false),
PasswordHash = table.Column<string>(type: "nvarchar(max)", nullable: true),
SecurityStamp = table.Column<string>(type: "nvarchar(max)", nullable: true),
ConcurrencyStamp = table.Column<string>(type: "nvarchar(max)", nullable: true),
PhoneNumber = table.Column<string>(type: "nvarchar(max)", nullable: true),
PhoneNumberConfirmed = table.Column<bool>(type: "bit", nullable: false),
TwoFactorEnabled = table.Column<bool>(type: "bit", nullable: false),
LockoutEnd = table.Column<DateTimeOffset>(type: "datetimeoffset", nullable: true),
LockoutEnabled = table.Column<bool>(type: "bit", nullable: false),
AccessFailedCount = table.Column<int>(type: "int", nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Users", x => x.Id);
});
migrationBuilder.CreateTable(
name: "RoleClaims",
columns: table => new
{
Id = table.Column<int>(type: "int", nullable: false)
.Annotation("SqlServer:Identity", "1, 1"),
RoleId = table.Column<int>(type: "int", nullable: false),
ClaimType = table.Column<string>(type: "nvarchar(max)", nullable: true),
ClaimValue = table.Column<string>(type: "nvarchar(max)", nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_RoleClaims", x => x.Id);
table.ForeignKey(
name: "FK_RoleClaims_AspNetRoles_RoleId",
column: x => x.RoleId,
principalTable: "AspNetRoles",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "GPSData",
columns: table => new
{
Id = table.Column<int>(type: "int", nullable: false)
.Annotation("SqlServer:Identity", "1, 1"),
Longitude = table.Column<double>(type: "float", nullable: false),
Latitude = table.Column<double>(type: "float", nullable: false),
Speed = table.Column<double>(type: "float", nullable: false),
Timestamp = table.Column<DateTime>(type: "datetime2", nullable: false),
UserId = table.Column<int>(type: "int", nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_GPSData", x => x.Id);
table.ForeignKey(
name: "FK_GPSData_Users_UserId",
column: x => x.UserId,
principalTable: "Users",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "UserClaims",
columns: table => new
{
Id = table.Column<int>(type: "int", nullable: false)
.Annotation("SqlServer:Identity", "1, 1"),
UserId = table.Column<int>(type: "int", nullable: false),
ClaimType = table.Column<string>(type: "nvarchar(max)", nullable: true),
ClaimValue = table.Column<string>(type: "nvarchar(max)", nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_UserClaims", x => x.Id);
table.ForeignKey(
name: "FK_UserClaims_Users_UserId",
column: x => x.UserId,
principalTable: "Users",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "UserLogins",
columns: table => new
{
LoginProvider = table.Column<string>(type: "nvarchar(450)", nullable: false),
ProviderKey = table.Column<string>(type: "nvarchar(450)", nullable: false),
ProviderDisplayName = table.Column<string>(type: "nvarchar(max)", nullable: true),
UserId = table.Column<int>(type: "int", nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_UserLogins", x => new { x.LoginProvider, x.ProviderKey });
table.ForeignKey(
name: "FK_UserLogins_Users_UserId",
column: x => x.UserId,
principalTable: "Users",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "UserRoles",
columns: table => new
{
UserId = table.Column<int>(type: "int", nullable: false),
RoleId = table.Column<int>(type: "int", nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_UserRoles", x => new { x.UserId, x.RoleId });
table.ForeignKey(
name: "FK_UserRoles_AspNetRoles_RoleId",
column: x => x.RoleId,
principalTable: "AspNetRoles",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
table.ForeignKey(
name: "FK_UserRoles_Users_UserId",
column: x => x.UserId,
principalTable: "Users",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "UserTokens",
columns: table => new
{
UserId = table.Column<int>(type: "int", nullable: false),
LoginProvider = table.Column<string>(type: "nvarchar(450)", nullable: false),
Name = table.Column<string>(type: "nvarchar(450)", nullable: false),
Value = table.Column<string>(type: "nvarchar(max)", nullable: true)
},
constraints: table =>
{
table.PrimaryKey("PK_UserTokens", x => new { x.UserId, x.LoginProvider, x.Name });
table.ForeignKey(
name: "FK_UserTokens_Users_UserId",
column: x => x.UserId,
principalTable: "Users",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "UserUser",
columns: table => new
{
TrackedId = table.Column<int>(type: "int", nullable: false),
TrackersId = table.Column<int>(type: "int", nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_UserUser", x => new { x.TrackedId, x.TrackersId });
table.ForeignKey(
name: "FK_UserUser_Users_TrackedId",
column: x => x.TrackedId,
principalTable: "Users",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
table.ForeignKey(
name: "FK_UserUser_Users_TrackersId",
column: x => x.TrackersId,
principalTable: "Users",
principalColumn: "Id",
onDelete: ReferentialAction.Restrict);
});
migrationBuilder.CreateIndex(
name: "RoleNameIndex",
table: "AspNetRoles",
column: "NormalizedName",
unique: true,
filter: "[NormalizedName] IS NOT NULL");
migrationBuilder.CreateIndex(
name: "IX_GPSData_UserId",
table: "GPSData",
column: "UserId");
migrationBuilder.CreateIndex(
name: "IX_RoleClaims_RoleId",
table: "RoleClaims",
column: "RoleId");
migrationBuilder.CreateIndex(
name: "IX_UserClaims_UserId",
table: "UserClaims",
column: "UserId");
migrationBuilder.CreateIndex(
name: "IX_UserLogins_UserId",
table: "UserLogins",
column: "UserId");
migrationBuilder.CreateIndex(
name: "IX_UserRoles_RoleId",
table: "UserRoles",
column: "RoleId");
migrationBuilder.CreateIndex(
name: "EmailIndex",
table: "Users",
column: "NormalizedEmail");
migrationBuilder.CreateIndex(
name: "UserNameIndex",
table: "Users",
column: "NormalizedUserName",
unique: true,
filter: "[NormalizedUserName] IS NOT NULL");
migrationBuilder.CreateIndex(
name: "IX_UserUser_TrackersId",
table: "UserUser",
column: "TrackersId");
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropTable(
name: "GPSData");
migrationBuilder.DropTable(
name: "RoleClaims");
migrationBuilder.DropTable(
name: "Roles");
migrationBuilder.DropTable(
name: "UserClaims");
migrationBuilder.DropTable(
name: "UserLogins");
migrationBuilder.DropTable(
name: "UserRoles");
migrationBuilder.DropTable(
name: "UserTokens");
migrationBuilder.DropTable(
name: "UserUser");
migrationBuilder.DropTable(
name: "AspNetRoles");
migrationBuilder.DropTable(
name: "Users");
}
}
那么错误在哪里呢?
解决方案
据我了解,Entity Framework 通常无法检测到您的意图何时只是重命名列/表或实际删除它并创建其他内容,因此它最终构建了一个删除并重新创建列/表的迁移。
从文档:
EF Core 通常无法知道何时打算删除列并创建新列(两个单独的更改),以及何时应重命名列。如果按原样应用上述迁移,您的所有客户名称都将丢失。要重命名列,请将上面生成的迁移替换为以下内容:
在这种情况下,您应该做的是自定义由 EF 自动搭建的迁移代码。在这种情况下,您可以利用这些方法RenameColumn
并RenameTable
指定在迁移中只应进行重命名操作。
因此,在生成迁移之后,删除两个and方法中的Drop
andCreate
语句,并将它们替换为对and的相应调用。Up
Down
RenameTable
RenameColumn
例如:
public partial class AddedTrackingProperties : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.RenameTable(
name: "IdentityUserRole", newName: "UserRoles");
// ...
// TODO: other necessary rename tables/columns
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.RenameTable(
name: "UserRoles", newName: "IdentityUserRole");
// ...
// TODO: other necessary rename tables/columns
}
}
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