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# UniquenessOfInMemoryValidator
#
# This validtor is designed for especially the following condition
# - Use `accepts_nested_attributes_for :xxx` in a parent model
# - Use `validates :xxx, uniqueness: { scope: :xxx_id }` in a child model
#
# Inspired by https://stackoverflow.com/a/2883129/2522666
module ActiveRecord
class Base
# Validate that the the objects in +collection+ are unique
# when compared against all their non-blank +attrs+. If not
# add +message+ to the base errors.
def validate_uniqueness_of_in_memory(collection, attrs, message)
hashes = collection.inject({}) do |hash, record|
key = attrs.map { |a| record.send(a).to_s }.join
if key.blank? || record.marked_for_destruction?
key = record.object_id
end
hash[key] = record unless hash[key]
hash
end
if collection.length > hashes.length
self.errors.add(*message)
end
end
end
end
class UniquenessOfInMemoryValidator < ActiveModel::Validator
def validate(record)
record.validate_uniqueness_of_in_memory(
record.public_send(options[:collection]),
options[:attrs],
options[:message])
end
end
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