Implement conflicts table generation

app/controllers/conflicts_controller.rb

@@ -0,0 +1,11 @@
+class ConflictsController < ApplicationController
+  def show
+    @conflicts_table = ConflictsTable.new conflicts_table_params
+  end
+
+  private
+
+  def conflicts_table_params
+    params.require(:conflicts_table).permit(:talk_id, other_talks_ids: [])
+  end
+end

app/models/conflicts.rb

@@ -0,0 +1,12 @@
+class Conflicts
+  include ActiveModel::Model
+
+  attr_accessor :left, :right
+
+  def conflicts
+    TalkPreference.joins('INNER JOIN "selected_talks" AS left
+                          ON "left"."talk_preference_id" = "talk_preferences"."unique_id"
+                          INNER JOIN "selected_talks" AS right
+                          ON "right"."talk_preference_id" = "talk_preferences"."unique_id"').where(left: {talk_id: @left}, right: {talk_id: @right}).count
+  end
+end

app/models/conflicts_table.rb

@@ -0,0 +1,18 @@
+class ConflictsTable
+  include ActiveModel::Model
+
+  attr_accessor :talk_id, :other_talks_ids
+
+  def other_talks_ids
+    @other_talks_ids ||= []
+  end
+
+  def conflicts
+    other_talks_ids.map do |right|
+      {
+       talk_id: right,
+       number_of_conflicts: Conflicts.new(left: talk_id, right: right).conflicts
+      }
+    end
+  end
+end

app/views/conflicts/show.json.jbuilder

@@ -0,0 +1 @@
+json.extract! @conflicts_table, :talk_id, :conflicts

config/routes.rb

@@ -2,5 +2,6 @@ Rails.application.routes.draw do
   resources :talk_preferences, only: [:index, :show, :create, :update]
   root to: 'home#index'
   resource :summary, only: :show
+  resource :conflicts, only: :show
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
 end