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require 'active_model/forbidden_attributes_protection'
module ActiveRecord
module AttributeAssignment
extend ActiveSupport::Concern
include ActiveModel::AttributeAssignment
# Alias for `assign_attributes`. See +ActiveModel::AttributeAssignment+.
def attributes=(attributes)
assign_attributes(attributes)
end
private
def _assign_attributes(attributes) # :nodoc:
multi_parameter_attributes = {}
nested_parameter_attributes = {}
attributes.each do |k, v|
if k.include?("(")
multi_parameter_attributes[k] = attributes.delete(k)
elsif v.is_a?(Hash)
nested_parameter_attributes[k] = attributes.delete(k)
end
end
super(attributes)
assign_nested_parameter_attributes(nested_parameter_attributes) unless nested_parameter_attributes.empty?
assign_multiparameter_attributes(multi_parameter_attributes) unless multi_parameter_attributes.empty?
end
# Tries to assign given value to given attribute.
# In case of an error, re-raises with the ActiveRecord constant.
def _assign_attribute(k, v) # :nodoc:
super
rescue ActiveModel::UnknownAttributeError
raise UnknownAttributeError.new(self, k)
end
# Assign any deferred nested attributes after the base attributes have been set.
def assign_nested_parameter_attributes(pairs)
pairs.each { |k, v| _assign_attribute(k, v) }
end
# Instantiates objects for all attribute classes that needs more than one constructor parameter. This is done
# by calling new on the column type or aggregation type (through composed_of) object with these parameters.
# So having the pairs written_on(1) = "2004", written_on(2) = "6", written_on(3) = "24", will instantiate
# written_on (a date type) with Date.new("2004", "6", "24"). You can also specify a typecast character in the
# parentheses to have the parameters typecasted before they're used in the constructor. Use i for Fixnum and
# f for Float. If all the values for a given attribute are empty, the attribute will be set to +nil+.
def assign_multiparameter_attributes(pairs)
execute_callstack_for_multiparameter_attributes(
extract_callstack_for_multiparameter_attributes(pairs)
)
end
def execute_callstack_for_multiparameter_attributes(callstack)
errors = []
callstack.each do |name, values_with_empty_parameters|
begin
if values_with_empty_parameters.each_value.all?(&:nil?)
values = nil
else
values = values_with_empty_parameters
end
send("#{name}=", values)
rescue => ex
errors << AttributeAssignmentError.new("error on assignment #{values_with_empty_parameters.values.inspect} to #{name} (#{ex.message})", ex, name)
end
end
unless errors.empty?
error_descriptions = errors.map(&:message).join(",")
raise MultiparameterAssignmentErrors.new(errors), "#{errors.size} error(s) on assignment of multiparameter attributes [#{error_descriptions}]"
end
end
def extract_callstack_for_multiparameter_attributes(pairs)
attributes = {}
pairs.each do |(multiparameter_name, value)|
attribute_name = multiparameter_name.split("(").first
attributes[attribute_name] ||= {}
parameter_value = value.empty? ? nil : type_cast_attribute_value(multiparameter_name, value)
attributes[attribute_name][find_parameter_position(multiparameter_name)] ||= parameter_value
end
attributes
end
def type_cast_attribute_value(multiparameter_name, value)
multiparameter_name =~ /\([0-9]*([if])\)/ ? value.send("to_" + $1) : value
end
def find_parameter_position(multiparameter_name)
multiparameter_name.scan(/\(([0-9]*).*\)/).first.first.to_i
end
end
end
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