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module ActiveRecord
module AttributeMethods
# = Active Record Attribute Methods Before Type Cast
#
# ActiveRecord::AttributeMethods::BeforeTypeCast provides a way to
# read the value of the attributes before typecasting and deserialization.
#
# class Task < ActiveRecord::Base
# end
#
# task = Task.new(id: '1', completed_on: '2012-10-21')
# task.id # => 1
# task.completed_on # => Sun, 21 Oct 2012
#
# task.attributes_before_type_cast
# # => {"id"=>"1", "completed_on"=>"2012-10-21", ... }
# task.read_attribute_before_type_cast('id') # => "1"
# task.read_attribute_before_type_cast('completed_on') # => "2012-10-21"
#
# In addition to #read_attribute_before_type_cast and #attributes_before_type_cast,
# it declares a method for all attributes with the <tt>*_before_type_cast</tt>
# suffix.
#
# task.id_before_type_cast # => "1"
# task.completed_on_before_type_cast # => "2012-10-21"
module BeforeTypeCast
extend ActiveSupport::Concern
included do
attribute_method_suffix "_before_type_cast"
attribute_method_suffix "_came_from_user?"
end
# Returns the value of the attribute identified by +attr_name+ before
# typecasting and deserialization.
#
# class Task < ActiveRecord::Base
# end
#
# task = Task.new(id: '1', completed_on: '2012-10-21')
# task.read_attribute('id') # => 1
# task.read_attribute_before_type_cast('id') # => '1'
# task.read_attribute('completed_on') # => Sun, 21 Oct 2012
# task.read_attribute_before_type_cast('completed_on') # => "2012-10-21"
# task.read_attribute_before_type_cast(:completed_on) # => "2012-10-21"
def read_attribute_before_type_cast(attr_name)
@attributes[attr_name.to_s].value_before_type_cast
end
# Returns a hash of attributes before typecasting and deserialization.
#
# class Task < ActiveRecord::Base
# end
#
# task = Task.new(title: nil, is_done: true, completed_on: '2012-10-21')
# task.attributes
# # => {"id"=>nil, "title"=>nil, "is_done"=>true, "completed_on"=>Sun, 21 Oct 2012, "created_at"=>nil, "updated_at"=>nil}
# task.attributes_before_type_cast
# # => {"id"=>nil, "title"=>nil, "is_done"=>true, "completed_on"=>"2012-10-21", "created_at"=>nil, "updated_at"=>nil}
def attributes_before_type_cast
@attributes.values_before_type_cast
end
private
# Handle *_before_type_cast for method_missing.
def attribute_before_type_cast(attribute_name)
read_attribute_before_type_cast(attribute_name)
end
def attribute_came_from_user?(attribute_name)
@attributes[attribute_name].came_from_user?
end
end
end
end
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