MVC migrations - Empty Up/ Down methods

Question

User-280480587 posted

Hi

I am trying to use migrations but they seem to be empty after creating for a new model.

I have created a test 'asp web application' using MVC and included authentication for 'individual user accounts'

I then enter the following in the console:

Enable-Migrations

Create-Migration Initial

Update-Database

I then create a new model with some test properties, and the create a new migration as above with out the 'Enable-Migrations' part.

I get no errors but my new migration is empty. Why is this. What have i missed?

Thanks

Answer 1

User-271186128 posted

Hi Izeko2004,

I then create a new model with some test properties, and the create a new migration as above with out the 'Enable-Migrations' part.

I get no errors but my new migration is empty. Why is this. What have i missed?

If you want to add a new model, after adding the model class file, you need to add the DbSet properties in your DBContext class. 

like this sample: after adding the Student class, add the DbSet property in the SchoolContext

    public class SchoolContext: DbContext 
    {
        public SchoolContext(): base()
        {
            
        }
            
        public DbSet<Student> Students { get; set; }
        public DbSet<Grade> Grades { get; set; }
    }

Then, using Add-Migration command to generate a migration class, finally, update the database using the Update-Database command.

More details about EF Code First, please refer to the following links:

http://www.entityframeworktutorial.net/code-first/code-based-migration-in-code-first.aspx

http://www.entityframeworktutorial.net/code-first/simple-code-first-example.aspx

Best regards,
Dillion