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Contents
# encoding: utf-8
module Mongoid
module Validations
# Validates that the specified collections do or do not match a certain
# size.
#
# @example Set up the collection size validator.
#
# class Person
# include Mongoid::Document
# has_many :addresses
#
# validates_collection_size_of :addresses, in: 1..10
# end
class CollectionSizeValidator < LengthValidator
def validate_each_with_collection(record, attribute, value)
value = collection_to_size(record, attribute)
self.validate_each_without_collection(record, attribute, value)
end
alias_method_chain :validate_each, :collection
private
def collection_to_size(record, attribute)
relation = record.relations[attribute.to_s]
source = case relation.macro
when :embeds_many, :has_many
record.send(attribute)
when :has_and_belongs_to_many
record.send(relation.key.to_sym)
end
OpenStruct.new(length: source.try(:size) || 0)
end
end
end
end
Version data entries
12 entries across 12 versions & 2 rubygems