[Rails] has_and_belongs_to_many question

Ruby on Rails Friday, January 24, 2014

Hello,

I'm new to Ruby/Rails and going through 'Beginning Rails 4'. In chapter 6 it has me create a join table for an articles and categories table (articles_categories). In the migrate file I've entered this code from the book:

class CreateArticlesCategories < ActiveRecord::Migration
def change
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

My issue is that after I migrate this file, when I try to make an association between the article and category object (article.categories << category) it spits an error that article_id does not exist in articles_categories table. It makes sense to me since the references above do no have _id appended in the class. If I change the class to the following, creating the relationship between article and category works fine:

class CreateArticlesCategories < ActiveRecord::Migration
def change
create_table :articles_categories, :id=> false do |t|
t.integer :article_id
t.integer :category_id
end
end
def self.down
drop_table :articles_categories
end
end

My question is, how can I get the 't.references' format to work so that AR looks for an 'articles' and 'categories' column, instead of the same with _id appended?

Thanks

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[Rails] has_and_belongs_to_many question

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