Introduce a Participation model

This model is responsible for the 1..n - 1..n relationship between an
event and the people that will participate in it.

app/models/concerns/proposable.rb

@@ -1,12 +1,9 @@
 module Proposable
   extend ActiveSupport::Concern
 
-  def proposer
-    proposition.proposer
-  end
-
   included do
     has_one :proposition, as: :proposable
+    has_one :proposer, through: :proposition
 
     Proposition.defined_enums["status"].keys.each do |status|
       scope status.to_sym, -> { joins(:proposition).where(propositions: {status: Proposition.defined_enums["status"][status]}) }

app/models/conference.rb

@@ -10,10 +10,10 @@ class Conference < ActiveRecord::Base
 
   has_many :tracks
   has_many :halls
-  has_many :events, through: :tracks
   has_many :event_types
+  has_many :events, through: :tracks
   has_one :call_for_participation, dependent: :destroy
-  has_many :participant_profiles, class_name: 'PersonalProfile'
+  has_many :participants, class_name: 'User', through: :events
 
   accepts_nested_attributes_for :tracks, :halls, :event_types, reject_if: :all_blank, allow_destroy: true
 

app/models/event.rb

@@ -3,6 +3,12 @@ class Event < ActiveRecord::Base
 
   has_one :track, through: :proposition, source: :proposition_accepting, source_type: Track
   has_one :conference, through: :track
+
+  has_many :participations
+  has_many :pending_participations, ->() { pending }, class_name: 'Participation'
+  has_many :approved_participations, ->() { approved }, class_name: 'Participation'
+  has_many :participants, through: :approved_participations
+
   belongs_to :event_type
 
   validates :title, presence: true

app/models/participation.rb

@@ -0,0 +1,7 @@
+class Participation < ActiveRecord::Base
+  belongs_to :participant, class_name: User
+  belongs_to :event
+
+  scope :approved, ->() { where approved: true }
+  scope :pending, ->() { where.not approved: true }
+end

db/migrate/20150729135346_create_participations.rb

@@ -0,0 +1,11 @@
+class CreateParticipations < ActiveRecord::Migration
+  def change
+    create_table :participations do |t|
+      t.references :participant, index: true, foreign_key: true
+      t.references :event, index: true, foreign_key: true
+      t.boolean :approved, default: false
+
+      t.timestamps null: false
+    end
+  end
+end

db/migrate/20150729135818_create_participation_records.rb

@@ -0,0 +1,18 @@
+class Participation   < ActiveRecord::Base; end
+class PersonalProfile < ActiveRecord::Base; end
+
+class CreateParticipationRecords < ActiveRecord::Migration
+  def up
+    event_to_speaker_profiles = execute 'SELECT * FROM events_speaker_profiles'
+
+    event_to_speaker_profiles.each do |event_to_speaker_profile|
+      Participation.create! event_id: event_to_speaker_profile['event_id'],
+                            participant_id: PersonalProfile.find(event_to_speaker_profile['speaker_profile_id']).user_id,
+                            approved: true
+    end
+  end
+
+  def down
+    Participation.destroy_all
+  end
+end

db/migrate/20150729145831_drop_join_table_events_sepaker_profiles.rb

@@ -0,0 +1,5 @@
+class DropJoinTableEventsSepakerProfiles < ActiveRecord::Migration
+  def up
+    drop_table :events_speaker_profiles
+  end
+end

spec/factories/participations.rb

@@ -0,0 +1,7 @@
+FactoryGirl.define do
+  factory :participation do
+    association :participant, factory: :user
+    event
+    approved false
+  end
+end