Question

I have the following factories:

  factory :post do
    title "lorem"
    content "lorem ipsum"
    category_id 
    user
  end

  factory :category do
    name "Lorem"
  end

I want to fill category_id somehow with the :category factory.

Pretty much mimicking what I do in my view:

<%= f.collection_select :category_id, Category.order(:name), :id, :name,
                        { prompt: 'Select Category' } %>

(The categories in this case are already created).

How to accomplish that?

Answer 1

If you just replace category_id by category in your post factory, like this:

factory :post do
  title "lorem"
  content "lorem ipsum"
  category
  user
end

then factory_girl will initiate the association using the category factory, in the process setting category_id on the Post record. For details see the documentation on factory_girl interaction with ActiveRecord.