Automatically create an associated CFP with a Conference

Make sure there is always an associated unopened call for participation
for each conference.

app/models/conference.rb

@@ -15,6 +15,8 @@ class Conference < ActiveRecord::Base
 
   accepts_nested_attributes_for :tracks, :halls, reject_if: :all_blank, allow_destroy: true
 
+  after_create :create_call_for_participation
+
   def submissions_grouped_by_day
     submissions = events.group('date(events.created_at)').select('events.created_at, count(events.id) as number')
     submissions.group_by { |s| s.created_at.to_date }

spec/models/conference_spec.rb

@@ -99,6 +99,11 @@ RSpec.describe Conference, :type => :model do
       conference.destroy
       expect { CallForParticipation.find(call_for_participation.id) }.to raise_exception ActiveRecord::RecordNotFound
     end
+
+    it 'creates an associated call for participation when the conference is created' do
+      conference.save
+      expect(conference.call_for_participation).to be_present
+    end
   end
 
   it 'accepts nested attributes for tracks' do