EF Core 添加迁移问题 - 如何修复不同步迁移？

Question

I have a.Net Core 2.2 MVC App running locally, with added scaffolded Identity as the authentication (I have all the ASPNetUsers/ASPNetRoles tables etc). I am using a Postgres Database. I also have two 2 context class in my project, one is the IdentityDbContext which was added with the scaffolded Identity code and i have my DbContext which maps all my non Identity tables in my project.

Here is my IdentityDbContext class:

public class PhotoUploaderFormContext : IdentityDbContext<ApplicationUser, IdentityRole, string>
{
    public PhotoUploaderFormContext(DbContextOptions<PhotoUploaderFormContext> options)
        : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
        // Customize the ASP.NET Identity model and override the defaults if needed.
        // For example, you can rename the ASP.NET Identity table names and more.
        // Add your customizations after calling base.OnModelCreating(builder);
    }
}

This simply maps my ApplicationUser.cs class (which is the user account for logging into my App). Everything was working fine prior with regards to adding new properties to my ApplicationUser.cs class, Adding a Migration, Updating Database, and then these additional properties appear in my ASPNetUsers table.

I have recently tried to add another property to my Application.cs class. (It has been a long while since I have done, and there as been additional migrations added with my DbContext class in between).

The migration code looked correct:

  public partial class templateSubmission : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<string>(
                name: "SubmitTemplateFormAccess",
                table: "AspNetUsers",
                nullable: true);
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropColumn(
                name: "SubmitTemplateFormAccess",
                table: "AspNetUsers");
        }
    }

However, when I try to Update-Database , (using the IdentityDbContext ), I get the following error:

Microsoft.EntityFrameworkCore.Infrastructure[10403]
      Entity Framework Core 2.2.6-servicing-10079 initialized 'PhotoUploaderFormContext' using provider 'Npgsql.EntityFrameworkCore.PostgreSQL' with options: None
Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (37ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT EXISTS (SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON n.oid=c.relnamespace WHERE c.relname='__EFMigrationsHistory');
Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (83ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT EXISTS (SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON n.oid=c.relnamespace WHERE c.relname='__EFMigrationsHistory');
Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (128ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT "MigrationId", "ProductVersion"
      FROM "__EFMigrationsHistory"
      ORDER BY "MigrationId";
Applying migration '20200217104808_CreateIdentitySchema'.
Microsoft.EntityFrameworkCore.Migrations[20402]
      Applying migration '20200217104808_CreateIdentitySchema'.
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
      Failed executing DbCommand (240ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      CREATE TABLE "AspNetRoles" (
          "Id" text NOT NULL,
          "Name" character varying(256) NULL,
          "NormalizedName" character varying(256) NULL,
          "ConcurrencyStamp" text NULL,
          CONSTRAINT "PK_AspNetRoles" PRIMARY KEY ("Id")
      );
Npgsql.PostgresException (0x80004005): 42P07: relation "AspNetRoles" already exists
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext() in C:\projects\npgsql\src\Npgsql\NpgsqlConnector.cs:line 1032
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming) in C:\projects\npgsql\src\Npgsql\NpgsqlDataReader.cs:line 490
   at Npgsql.NpgsqlDataReader.NextResult() in C:\projects\npgsql\src\Npgsql\NpgsqlDataReader.cs:line 332
   at Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken) in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1218
   at Npgsql.NpgsqlCommand.ExecuteNonQuery(Boolean async, CancellationToken cancellationToken) in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1042
   at Npgsql.NpgsqlCommand.ExecuteNonQuery() in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1025
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary`2 parameterValues)
Failed executing DbCommand (240ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE "AspNetRoles" (
    "Id" text NOT NULL,
    "Name" character varying(256) NULL,
    "NormalizedName" character varying(256) NULL,
    "ConcurrencyStamp" text NULL,
    CONSTRAINT "PK_AspNetRoles" PRIMARY KEY ("Id")
);
Npgsql.PostgresException (0x80004005): 42P07: relation "AspNetRoles" already exists
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext() in C:\projects\npgsql\src\Npgsql\NpgsqlConnector.cs:line 1032
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming) in C:\projects\npgsql\src\Npgsql\NpgsqlDataReader.cs:line 490
   at Npgsql.NpgsqlDataReader.NextResult() in C:\projects\npgsql\src\Npgsql\NpgsqlDataReader.cs:line 332
   at Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken) in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1218
   at Npgsql.NpgsqlCommand.ExecuteNonQuery(Boolean async, CancellationToken cancellationToken) in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1042
   at Npgsql.NpgsqlCommand.ExecuteNonQuery() in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1025
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
   at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_1.<.ctor>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
42P07: relation "AspNetRoles" already exists

It seems to be applying an older migration - 20200217104808_CreateIdentitySchema . This was the initial migration that created all of my Identity tables, such as ASPNetRoles, AspNetUserClaims, AspNetUserLogins etc.

Any idea how to fix this mess? I have been trying for several days but unable to. Online suggestions where to delete all my migrations and start over, but I wanted to see if i could avoid that. Many thanks

Answer 1

If you have one stable migration version in migrationHistory table, then

1: run update-database {MIGRATION_NAME_WITHOUT DATE}
2: run remove-migration
3: run add-migrarion (this will add migrations for any pending changes)
4: finally run "update-database"