Method: ActiveRecord::QueryMethods#group

Defined in:
lib/active_record/relation/query_methods.rb

#group(*args) ⇒ Object

Allows to specify a group attribute:

User.group(:name)
=> SELECT "users".* FROM "users" GROUP BY name

Returns an array with distinct records based on the group attribute:

User.select([:id, :name])
=> [#<User id: 1, name: "Oscar">, #<User id: 2, name: "Oscar">, #<User id: 3, name: "Foo">

User.group(:name)
=> [#<User id: 3, name: "Foo", ...>, #<User id: 2, name: "Oscar", ...>]

User.group('name AS grouped_name, age')
=> [#<User id: 3, name: "Foo", age: 21, ...>, #<User id: 2, name: "Oscar", age: 21, ...>, #<User id: 5, name: "Foo", age: 23, ...>]



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# File 'lib/active_record/relation/query_methods.rb', line 243

def group(*args)
  check_if_method_has_arguments!("group", args)
  spawn.group!(*args)
end