# module ActiveRecord::AttributeAssignment

### Public Instance Methods

attributes=(attributes) click to toggle source

Alias for ActiveModel::AttributeAssignment#assign_attributes. See ActiveModel::AttributeAssignment.

    # File lib/active_record/attribute_assignment.rb, line 9
    def attributes=(attributes)
      assign_attributes(attributes)
    end

### Private Instance Methods

_assign_attributes(attributes) click to toggle source
Calls superclass method

    # File lib/active_record/attribute_assignment.rb, line 15
    def _assign_attributes(attributes)
      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

assign_multiparameter_attributes(pairs) click to toggle source

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 Integer and f for Float. If all the values for a given attribute are empty, the attribute will be set to `nil`.

    # File lib/active_record/attribute_assignment.rb, line 43
    def assign_multiparameter_attributes(pairs)
      execute_callstack_for_multiparameter_attributes(
        extract_callstack_for_multiparameter_attributes(pairs)
      )
    end

assign_nested_parameter_attributes(pairs) click to toggle source

Assign any deferred nested attributes after the base attributes have been set.

    # File lib/active_record/attribute_assignment.rb, line 33
    def assign_nested_parameter_attributes(pairs)
      pairs.each { |k, v| _assign_attribute(k, v) }
    end

execute_callstack_for_multiparameter_attributes(callstack) click to toggle source

    # File lib/active_record/attribute_assignment.rb, line 49
    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

extract_callstack_for_multiparameter_attributes(pairs) click to toggle source

    # File lib/active_record/attribute_assignment.rb, line 69
    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

find_parameter_position(multiparameter_name) click to toggle source

    # File lib/active_record/attribute_assignment.rb, line 87
    def find_parameter_position(multiparameter_name)
      multiparameter_name.scan(/\(([0-9]*).*\)/).first.first.to_i
    end

type_cast_attribute_value(multiparameter_name, value) click to toggle source

    # File lib/active_record/attribute_assignment.rb, line 83
    def type_cast_attribute_value(multiparameter_name, value)
      multiparameter_name =~ /\([0-9]*([if])\)/ ? value.send("to_" + $1) : value
    end