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Contents
# encoding: utf-8
module Mongoid #:nodoc:
module NamedScope
# Creates a named_scope for the +Document+, similar to ActiveRecord's
# named_scopes. +NamedScopes+ are proxied +Criteria+ objects that can be
# chained.
#
# Example:
#
# class Person
# include Mongoid::Document
# field :active, :type => Boolean
# field :count, :type => Integer
#
# named_scope :active, :where => { :active => true }
# named_scope :count_gt_one, :where => { :count.gt => 1 }
# named_scope :at_least_count, lambda { |count| { :where => { :count.gt => count } } }
# end
def named_scope(name, options = {}, &block)
name = name.to_sym
scopes[name] = lambda do |parent, *args|
Scope.new(parent, options.scoped(*args), &block)
end
(class << self; self; end).class_eval <<-EOT
def #{name}(*args)
scopes[:#{name}].call(self, *args)
end
EOT
end
# Return the scopes or default to an empty +Hash+.
def scopes
read_inheritable_attribute(:scopes) || write_inheritable_attribute(:scopes, {})
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems