ASP.NET Core multiple dbcontext cannot add migration

Question

I have 2 DbContexts:

services.AddDbContext<ConfigDbContext>(options => options.UseSqlServer(Configuration["Data:ConfigSQLServer:ConnectionString"].ToString(), t => t.MigrationsAssembly("App.Web")));

services.AddDbContext<AppDbContext>(options => options.UseSqlServer(Configuration["Data:AppSQLServer:ConnectionString"].ToString(), t => t.MigrationsAssembly("App.Web")));

when I try to run

dotnet ef migrations add Initial -c AppDbContext

I get:

No DbContext named 'AppDbContext' was found

If I run:

dotnet ef dbcontext list

the result is:

FullNamespace.ConfigDbContext

It doesn't seam to find the second DbContext AppDbContext

ConfigDbCOntext:

public class ConfigDbContext : DbContext
{
    public ConfigDbContext()
    {

    }

    public ConfigDbContext(DbContextOptions<ConfigDbContext> options) : base(options)
    {

    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

AppDbContext:

public class AppDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>
{
    public AppDbContext()
    {

    }

    public ConfigDbContext(DbContextOptions<AppDbContext> options) : base(options)
    {

    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

Answer 1

I have similar setups, except that my DbContext and my IdentityDbCotenxt live in different assemblies other than the web project.

ConfigDbContext

// Remove the parameter-less constructor

public class ConfigDbContext : DbContext
{
    public ConfigDbContext(DbContextOptions<ConfigDbContext> options) : base(options)
    { }

    rotected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

AppDbContext

// Remove the parameter-less constructor
// Rename the constructor to AppDbContext, instead of ConfigDbContext

public class AppDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>
{
    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
    { }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

Also in my IdentityDbContext, if you change the primary key to Guid , I have to override AppUserClaim , AppUserRole , AppUserLogin , AppRoleClaim and AppUserToken as well.

My example of IdentityDbContext

public class AppIdentityDbContext : IdentityDbContext<AppUser, AppRole, Guid, AppUserClaim, AppUserRole,
    AppUserLogin, AppRoleClaim, AppUserToken>
{
    public AppIdentityDbContext(DbContextOptions<AppIdentityDbContext> options)
        : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);

        builder.Entity<AppUser>().ToTable("User");
        builder.Entity<AppRole>().ToTable("Role");
        builder.Entity<AppUserRole>().ToTable("UserRole");

        builder.Entity<AppUserClaim>().ToTable("UserClaim");
        builder.Entity<AppRoleClaim>().ToTable("RoleClaim");

        builder.Entity<AppUserLogin>().ToTable("UserLogin");
        builder.Entity<AppUserToken>().ToTable("UserToken");
    }
}

I don't think this is the issue but if my suggestions from the beginning don't fix the issue, might give this a trial.

Answer 2

AppDbContext should be：

public class AppDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>
{
    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
    {

    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}