empty?

empty?()

Instance Public methods

Returns true if the collection is empty. If the collection has been loaded 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

Links:

https://github.com/rails/rails/blob/553e61af007553788813f81963a7621c82fff65d/activerecord/lib/active_record/associations/collection_proxy.rb#L778

doc_ruby_on_rails

2025-01-10 15:47:30

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