class CreateFollows

# File lib/generators/follow_system/templates/migration.rb, line 10
def change
  ###
  # Follows table creation
  ###
  create_table :follows do |t|
    ###
    # Followee id field and followee type field definition
    ###
    t.references :followee, polymorphic: true

    ###
    # Follower id fiel and follower type field definition
    ###
    t.references :follower, polymorphic: true

    ###
    # Timestamps fields definition
    ###
    t.timestamps null: false
  end

  ###
  # Follows table followee id field and followee type field index addition
  ###
  add_index :follows, [:followee_id, :followee_type], name: "follows_followee_idx"

  ###
  # Follows table follower id field and follower type field index addition
  ###
  add_index :follows, [:follower_id, :follower_type], name: "follows_follower_idx"

  ###
  # Follows table followee id field and followee type field and follower id field and follower type field unique index addition
  ###
  add_index :follows, [:followee_id, :followee_type, :follower_id, :follower_type], name: "follows_followee_follower_idx", unique: true
end