created channel for action cable and friendship relationship in database

Gemfile.lock

@@ -225,7 +225,7 @@ DEPENDENCIES
   webpacker
 
 RUBY VERSION
-   ruby 2.3.0p0
+   ruby 2.4.4p296
 
 BUNDLED WITH
    1.16.2

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

db/migrate/20180827151325_create_connections.rb

@@ -0,0 +1,8 @@
+class CreateConnections < ActiveRecord::Migration[5.2]
+  def change
+    create_table :connections do |t|
+      t.references :user, foreign_key: true, index: true
+      t.references :contact, foreign_key: { to_table: :users }, index: true
+    end
+  end
+end

db/schema.rb

@@ -10,11 +10,18 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_08_27_143700) do
+ActiveRecord::Schema.define(version: 2018_08_27_151325) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "connections", force: :cascade do |t|
+    t.bigint "user_id"
+    t.bigint "contact_id"
+    t.index ["contact_id"], name: "index_connections_on_contact_id"
+    t.index ["user_id"], name: "index_connections_on_user_id"
+  end
+
   create_table "users", force: :cascade do |t|
     t.string "email", default: "", null: false
     t.string "encrypted_password", default: "", null: false
@@ -27,4 +34,6 @@ ActiveRecord::Schema.define(version: 2018_08_27_143700) do
     t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
   end
 
+  add_foreign_key "connections", "users"
+  add_foreign_key "connections", "users", column: "contact_id"
 end

test/models/contact_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class ContactTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end