module ActiveRecord::AttributeAssignment

Private Instance Methods

_assign_attributes(attributes) click to toggle source
# File lib/active_record/attribute_assignment.rb, line 10
def _assign_attributes(attributes)
  multi_parameter_attributes = nested_parameter_attributes = nil

  attributes.each do |k, v|
    key = k.to_s

    if key.include?("(")
      (multi_parameter_attributes ||= {})[key] = v
    elsif v.is_a?(Hash)
      (nested_parameter_attributes ||= {})[key] = v
    else
      _assign_attribute(key, v)
    end
  end

  assign_nested_parameter_attributes(nested_parameter_attributes) if nested_parameter_attributes
  assign_multiparameter_attributes(multi_parameter_attributes) if multi_parameter_attributes
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 40
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 30
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 46
def execute_callstack_for_multiparameter_attributes(callstack)
  errors = []
  callstack.each do |name, values_with_empty_parameters|
    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
  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 64
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 82
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 78
def type_cast_attribute_value(multiparameter_name, value)
  multiparameter_name =~ /\([0-9]*([if])\)/ ? value.send("to_" + $1) : value
end