class CreateLikes

# File lib/generators/like_system/templates/migration.rb, line 10
def change
  ###
  # Likes table creation
  ###
  create_table :likes do |t|
    ###
    # Likee id field and likee type field definition
    ###
    t.references :likee, polymorphic: true

    ###
    # Liker id fiel and liker type field definition
    ###
    t.references :liker, polymorphic: true

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

  ###
  # Likes table likee id field and likee type field index addition
  ###
  add_index :likes, [:likee_id, :likee_type], name: "likes_likee_idx"

  ###
  # Likes table liker id field and liker type field index addition
  ###
  add_index :likes, [:liker_id, :liker_type], name: "likes_liker_idx"

  ###
  # Likes table likee id field and likee type field and liker id field and liker type field unique index addition
  ###
  add_index :likes, [:likee_id, :likee_type, :liker_id, :liker_type], name: "likes_likee_liker_idx", unique: true
end