There is already an object named 'AspNetRoles' in the database

Question

Some time ago, I created a ASP.NET MVC 5 website with the Identity 1.0 version, and i created the Identity tables with this project. Now i have to make other website using the same database for authentication, but now the Identity version is 2.0. So when i try to authenticate in the new website i get some errors.

Im trying to migrate the database using the Migrations approach, but its confused and im getting this error There is already an object named 'AspNetRoles' in the database. when i type Update-Database in the PM console.

My question is, how is the best way to use the same database for the authetication of both sites (one using the 1.0 identity version and other using 2.0). Do I really need to migrate the database?

If yes, how can i solve this error that im getting?

Answer 1

Add-Migration InitialMigrations -IgnoreChanges

This should generate a blank "InitialMigration" file. Now, add any desired changes to the class you want. Once changes are added, run the update command again:

update-database -verbose

Now the automatic migration will be applied and the table will be altered with your changes.

Edit: Here is a solution to migrate identity 1 to 2 Upgrading from ASP.NET.Identity 1.0 to 2.0 Use this manual migration

public override void Up()
    {
        RenameColumn(table: "dbo.AspNetUserClaims", name: "User_Id", newName: "UserId");
        RenameIndex(table: "dbo.AspNetUserClaims", name: "IX_User_Id", newName: "IX_UserId");
        DropPrimaryKey("dbo.AspNetUserLogins");
        AddColumn("dbo.AspNetUsers", "Email", c => c.String(maxLength: 256));
        AddColumn("dbo.AspNetUsers", "EmailConfirmed", c => c.Boolean(nullable: false));
        AddColumn("dbo.AspNetUsers", "PhoneNumber", c => c.String()); 
        AddColumn("dbo.AspNetUsers", "PhoneNumberConfirmed", c => c.Boolean(nullable: false));
        AddColumn("dbo.AspNetUsers", "TwoFactorEnabled", c => c.Boolean(nullable: false));
        AddColumn("dbo.AspNetUsers", "LockoutEndDateUtc", c => c.DateTime());
        AddColumn("dbo.AspNetUsers", "LockoutEnabled", c => c.Boolean(nullable: false));
        AddColumn("dbo.AspNetUsers", "AccessFailedCount", c => c.Int(nullable: false));
        AlterColumn("dbo.AspNetUsers", "UserName", c => c.String(nullable: false, maxLength: 256));
        AlterColumn("dbo.AspNetUsers", "FirstName", c => c.String(nullable: false));
        AlterColumn("dbo.AspNetUsers", "LastName", c => c.String(nullable: false));
        AddColumn("dbo.AspNetUsers", "CreatedDateTime", c => c.DateTime(nullable: false));
        AlterColumn("dbo.AspNetRoles", "Name", c => c.String(nullable: false, maxLength: 256));
        AddPrimaryKey("dbo.AspNetUserLogins", new[] { "LoginProvider", "ProviderKey", "UserId" });
        CreateIndex("dbo.AspNetUsers", "UserName", unique: true, name: "UserNameIndex");
        CreateIndex("dbo.AspNetRoles", "Name", unique: true, name: "RoleNameIndex");
        DropColumn("dbo.AspNetUsers", "Discriminator");
    }