Class: CreateMentions

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

Overview

CreateMentions class

This class defines the create mentions migration in mention system

Instance Method Summary collapse

Instance Method Details

#change ⇒ Object

Changes the database



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# File 'lib/generators/mention_system/templates/migration.rb', line 10

def change
  ###
  # Mentions table creation
  ###
  create_table :mentions do |t|
    ###
    # Mentionee id field and mentionee type field definition
    ###
    t.references :mentionee, polymorphic: true

    ###
    # Mentioner id fiel and mentioner type field definition
    ###
    t.references :mentioner, polymorphic: true

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

  ###
  # Mentions table mentionee id field and mentionee type field index addition
  ###
  add_index :mentions, [:mentionee_id, :mentionee_type], name: "mentions_mentionee_idx"

  ###
  # Mentions table mentioner id field and mentioner type field index addition
  ###
  add_index :mentions, [:mentioner_id, :mentioner_type], name: "mentions_mentioner_idx"

  ###
  # Mentions table mentionee id field and mentionee type field and mentioner id field and mentioner type field unique index addition
  ###
  add_index :mentions, [:mentionee_id, :mentionee_type, :mentioner_id, :mentioner_type], name: "mentions_mentionee_mentioner_idx", unique: true
end