created channel for action cable and friendship relationship in database

app/channels/video_session_channel.rb

@@ -0,0 +1,11 @@
+class VideoSessionChannel < ApplicationCable::Channel
+  def subscribed
+    # video session
+    # stream_from "chat_room_#{params[:chat_room_id]}"
+  end
+
+
+  def unsubscribed
+    # Any cleanup needed when channel is unsubscribed
+  end
+end

app/models/connection.rb

@@ -0,0 +1,14 @@
+class Connection < ApplicationRecord
+  belongs_to :user
+  belongs_to :contact, class_name: 'User', foreign_key: 'contact_id'
+
+  after_create :create_inverted_connection
+
+  private
+
+  def create_inverted_connection
+    unless Connection.where('user_id = ? and contact_id = ?', self.contact.id, self.user.id).length > 0
+      Connection.create!(user: self.contact, contact: self.user)
+    end
+  end
+end

app/models/user.rb

@@ -3,4 +3,12 @@ class User < ApplicationRecord
   # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :validatable
+
+  has_many :connections
+
+  def contacts
+    self.connections.map do |connection|
+      connection.contact
+    end
+  end
 end