Delete attribute from model in Ruby on Rails

Question

I generated a User model using this command:

rails generate model User name:string date_birth:date age:int...

As you can see I made a mistake. I entered a date of birth and an age. Now I also migrated into a mySql database. Is there any way to just delete the age field?

Edit: Is it also possible to add a field?

Answer 1

Create a new migration with

rails g migration migrationname

and in the migration's up method run the following

remove_column :users, :age

run rake db:migrate and you are good to go.

Answer 2

At least two choices:

1. You can run rake db:rollback, delete the field from the migration and then re-run rake db:migrate
2. You can create a new migration to delete the field with rails generate migration new_migration.