FactoryGirl: why does attributes_for omit some attributes?

Question

I want to use FactoryGirl.attributes_for in controller testing, as in:

it \"raise error creating a new PremiseGroup for this user\" do
  expect {
    post :c         


        

Answer 1

Here is another way:

FactoryGirl.build(:car).attributes.except('id', 'created_at', 'updated_at').symbolize_keys

Limitations:

• It does not generate attributes for HMT and HABTM associations (as these associations are stored in a join table, not an actual attribute).
• Association strategy in the factory must be create, as in association :user, strategy: :create. This strategy can make your factory very slow if you don't use it wisely.