instance method `empty?`

Ruby on Rails 4.0.13

Since v4.0.13

Available in: v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

empty?()

Returns true if the collection is empty. If the collection has been loaded or the :counter_sql option is provided, it is equivalent to collection.size.zero?. If the collection has not been loaded, it is equivalent to collection.exists?. If the collection has not already been loaded and you are going to fetch the records anyway it is better to check collection.length.zero?.

class Person < ActiveRecord::Base
  has_many :pets
end

person.pets.count  # => 1
person.pets.empty? # => false

person.pets.delete_all

person.pets.count  # => 0
person.pets.empty? # => true

Source

# File activerecord/lib/active_record/associations/collection_proxy.rb, line 747
      def empty?
        @association.empty?
      end

Defined in activerecord/lib/active_record/associations/collection_proxy.rb line 747 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::Associations::CollectionProxy

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