Add Rows on Migrations

Question

I\'d like to know which is the preferred way to add records to a database table in a Rails Migration. I\'ve read on Ola Bini\'s book (Jruby on Rails) that he does something

Answer 1

You should really not use

ProductType.create

in your migrations.

I have done similar but in the long run they are not guaranteed to work.

When you run the migration the model class you are using is the one at the time you run the migration, not the one at the time you created the migration. You will have to be sure you never change your model in such a way to stop you migration from running.

You are much better off running SQL for example:

[{name: 'Type', ..}, .. ].each do |type|
  execute("INSERT INTO product_types (name) VALUES ('#{type[:name]} .. )
end