Ruby on Rails

I needed a migration to create the join table that can connect the model
category with the model Article. So, I run the following command:

$ rails generate migration create_articles_categories

And then I added the appropriate fields.

class CreateArticlesCategories < ActiveRecord::Migration
def self.up
create_table :articles_categories, :id => false do |t|
t.references :article
t.references :category
end
end

def self.down
drop_table :articles_categories
end
end

And then I run the migrations:

$ rake db:migrate

But then no response was shown for long.

And after that, anytimes when I run the rake command, no response was
shown. May I ask if I have done anything wrong here?

Any help much appreciated.

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