class CreateRateTable

# File lib/generators/rating/templates/db/migrate/create_rate_table.rb, line 4
def change
  create_table :rating_rates do |t|
    t.decimal :value, default: 0, precision: 25, scale: 16

    t.references :author,    index: true, null: false, polymorphic: true
    t.references :resource,  index: true, null: false, polymorphic: true
    t.references :scopeable, index: true, null: true,  polymorphic: true

    t.timestamps null: false
  end

  change_column :rating_rates, :author_type,    :string, limit: 10
  change_column :rating_rates, :resource_type,  :string, limit: 10
  change_column :rating_rates, :scopeable_type, :string, limit: 10

  add_index :rating_rates, %i[author_type author_id resource_type resource_id scopeable_type scopeable_id],
    name:   :index_rating_rates_on_author_and_resource_and_scopeable,
    unique: true
end