Class: CreateFollows

Inherits:
Object
  • Object
show all
Defined in:
lib/generators/follow_system/templates/migration.rb

Overview

CreateFollows class

This class defines the create follows migration in follow system

Instance Method Summary collapse

Instance Method Details

#change ⇒ Object

Changes the database



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# 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