Forked from sj26/virtus-multiparameter_attributes.rb
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August 29, 2015 14:14
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# Rails datetime_select and similar use multiparameter attributes which are | |
# these dawful things from the bowels of activerecord and actionpack. This | |
# module extends virtus models to coerce multiparameter attributes back together | |
# before assigning attributes. | |
# | |
# Here's the implementation for ActiveRecord: | |
# | |
# https://github.com/rails/rails/blob/11fd052aa815ae0255ea5b2463e88138fb3fec61/activerecord/lib/active_record/attribute_assignment.rb#L113-L218 | |
# | |
# and DataMapper: | |
# | |
# https://github.com/datamapper/dm-rails/blob/5f3fb01a9d5f5adb17665a3bdabffd396d722e61/lib/dm-rails/multiparameter_attributes.rb | |
# | |
module Virtus::MultiparameterAttributes | |
extend ActiveSupport::Concern | |
included do | |
attribute_set.singleton_class.send(:include, AttributeSetExtension) | |
end | |
module AttributeSetExtension | |
extend ActiveSupport::Concern | |
included do | |
alias_method_chain :coerce, :multiparameter | |
end | |
def coerce_with_multiparameter(attributes) | |
coerce_without_multiparameter(attributes).tap do |attributes| | |
multiparams = Hash.new { |hash, key| hash[key] = {} } | |
attributes.each do |(key, value)| | |
if /\A(?<name>.+)\((?<offset>[0-9]+)(?<cast>[if])?\)\Z/ =~ key | |
attributes.delete(key) | |
unless attributes.include? name | |
offset = offset.to_i | |
value = value.send("to_#{cast}") if cast | |
multiparams[name][offset] = value | |
end | |
end | |
end | |
multiparams.each do |name, values| | |
array = Array.new(values.keys.max) | |
values.each do |offset, value| | |
array[offset - 1] = value | |
end | |
# Virus::Attribute has a primitive type which might be Date, Time, DateTime, etc. | |
attribute = self[name] | |
attributes[name] = if attribute.primitive < Date || attribute.primitive < Time | |
# Basic convesion is enough, Virtus invokes `to_date[time]` | |
# Also, lololol timezones | |
Time.new(*array[0...6]) | |
else | |
array | |
end | |
end | |
end | |
end | |
end | |
end |
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