FactoryGirl used with webmock

Question

My factory has an url field(used to fetch youtube embedded video):

factory :commercial do
    url 'https://www.youtube.com/watch?v=BTTygyxuGj8'
end

In my tests I tried to mock the request to youtube. I added following to my spec_helper:

require 'webmock/rspec'
WebMock.disable_net_connect!(allow_localhost: true)

RSpec.configure do |config|
  config.before(:suite) do
    mock_request
  end
end

def mock_request
  response = {
    author_name: 'Confreaks',
    # more attributes omitted ..
  }
  WebMock.stub_request(:get, /.*youtube.*/).
    to_return(status: 200, body: response.to_json, headers: {})
end

Isn't registering the webmock once in rspec config enough for the stub to be available through out the test suite? Why am I having to do this to my factory:

factory :commercial do
  url 'https://www.youtube.com/watch?v=BTTygyxuGj8'

  after(:build) do |commercial|
    mock_request
  end
end

Without the after(:build), I get following error:

Failure/Error: create(:commercial, WebMock::NetConnectNotAllowedError: Real HTTP connections are disabled. Unregistered request: ...tells me about unregistered request to youtube and how I should stub it...

Answer 1

Does fill out headers in to_return call help?

.to_return(
  ...,
  headers: { "Content-Type" => "application/json; charset=utf-8" }
)

fill the hash with values provided from failure output.