method
count
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Class: CollectionProxy
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- What's this?
count
public
class Person < ActiveRecord::Base has_many :pets end # This will perform the count using SQL. person.pets.count # => 3 person.pets # => [ # #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>, # #<Pet id: 2, name: "Spook", person_id: 1>, # #<Pet id: 3, name: "Choo-Choo", person_id: 1> # ]
Passing a block will select all of a person’s pets in SQL and then perform the count using Ruby.
person.pets.count { |pet| pet.name.include?('-') } # => 2