require 'active_support/concern' module ActiveRecord module AttributeAssignment extend ActiveSupport::Concern include ActiveModel::MassAssignmentSecurity module ClassMethods private # The primary key and inheritance column can never be set by mass-assignment for security reasons. def attributes_protected_by_default default = [ primary_key, inheritance_column ] default << 'id' unless primary_key.eql? 'id' default end end # Allows you to set all the attributes at once by passing in a hash with keys # matching the attribute names (which again matches the column names). # # If any attributes are protected by either +attr_protected+ or # +attr_accessible+ then only settable attributes will be assigned. # # class User < ActiveRecord::Base # attr_protected :is_admin # end # # user = User.new # user.attributes = { :username => 'Phusion', :is_admin => true } # user.username # => "Phusion" # user.is_admin? # => false def attributes=(new_attributes) return unless new_attributes.is_a?(Hash) assign_attributes(new_attributes) end # Allows you to set all the attributes for a particular mass-assignment # security role by passing in a hash of attributes with keys matching # the attribute names (which again matches the column names) and the role # name using the :as option. # # To bypass mass-assignment security you can use the :without_protection => true # option. # # class User < ActiveRecord::Base # attr_accessible :name # attr_accessible :name, :is_admin, :as => :admin # end # # user = User.new # user.assign_attributes({ :name => 'Josh', :is_admin => true }) # user.name # => "Josh" # user.is_admin? # => false # # user = User.new # user.assign_attributes({ :name => 'Josh', :is_admin => true }, :as => :admin) # user.name # => "Josh" # user.is_admin? # => true # # user = User.new # user.assign_attributes({ :name => 'Josh', :is_admin => true }, :without_protection => true) # user.name # => "Josh" # user.is_admin? # => true def assign_attributes(new_attributes, options = {}) return if new_attributes.blank? attributes = new_attributes.stringify_keys multi_parameter_attributes = [] nested_parameter_attributes = [] previous_options = @mass_assignment_options @mass_assignment_options = options unless options[:without_protection] attributes = sanitize_for_mass_assignment(attributes, mass_assignment_role) end attributes.each do |k, v| if k.include?("(") multi_parameter_attributes << [ k, v ] elsif respond_to?("#{k}=") if v.is_a?(Hash) nested_parameter_attributes << [ k, v ] else send("#{k}=", v) end else raise(UnknownAttributeError, "unknown attribute: #{k}") end end # assign any deferred nested attributes after the base attributes have been set nested_parameter_attributes.each do |k,v| send("#{k}=", v) end assign_multiparameter_attributes(multi_parameter_attributes) ensure @mass_assignment_options = previous_options end protected def mass_assignment_options @mass_assignment_options ||= {} end def mass_assignment_role mass_assignment_options[:as] || :default end private # 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, # f for Float, s for String, and a for Array. 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 instantiate_time_object(name, values) if self.class.send(:create_time_zone_conversion_attribute?, name, column_for_attribute(name)) Time.zone.local(*values) else Time.time_with_datetime_fallback(self.class.default_timezone, *values) end end def execute_callstack_for_multiparameter_attributes(callstack) errors = [] callstack.each do |name, values_with_empty_parameters| begin send(name + "=", read_value_from_parameter(name, values_with_empty_parameters)) rescue => ex errors << AttributeAssignmentError.new("error on assignment #{values_with_empty_parameters.values.inspect} to #{name}", ex, name) end end unless errors.empty? raise MultiparameterAssignmentErrors.new(errors), "#{errors.size} error(s) on assignment of multiparameter attributes" end end def read_value_from_parameter(name, values_hash_from_param) klass = (self.class.reflect_on_aggregation(name.to_sym) || column_for_attribute(name)).klass if values_hash_from_param.values.all?{|v|v.nil?} nil elsif klass == Time read_time_parameter_value(name, values_hash_from_param) elsif klass == Date read_date_parameter_value(name, values_hash_from_param) else read_other_parameter_value(klass, name, values_hash_from_param) end end def read_time_parameter_value(name, values_hash_from_param) # If Date bits were not provided, error raise "Missing Parameter" if [1,2,3].any?{|position| !values_hash_from_param.has_key?(position)} max_position = extract_max_param_for_multiparameter_attributes(values_hash_from_param, 6) # If Date bits were provided but blank, then return nil return nil if (1..3).any? {|position| values_hash_from_param[position].blank?} set_values = (1..max_position).collect{|position| values_hash_from_param[position] } # If Time bits are not there, then default to 0 (3..5).each {|i| set_values[i] = set_values[i].blank? ? 0 : set_values[i]} instantiate_time_object(name, set_values) end def read_date_parameter_value(name, values_hash_from_param) return nil if (1..3).any? {|position| values_hash_from_param[position].blank?} set_values = [values_hash_from_param[1], values_hash_from_param[2], values_hash_from_param[3]] begin Date.new(*set_values) rescue ArgumentError # if Date.new raises an exception on an invalid date instantiate_time_object(name, set_values).to_date # we instantiate Time object and convert it back to a date thus using Time's logic in handling invalid dates end end def read_other_parameter_value(klass, name, values_hash_from_param) max_position = extract_max_param_for_multiparameter_attributes(values_hash_from_param) values = (1..max_position).collect do |position| raise "Missing Parameter" if !values_hash_from_param.has_key?(position) values_hash_from_param[position] end klass.new(*values) end def extract_max_param_for_multiparameter_attributes(values_hash_from_param, upper_cap = 100) [values_hash_from_param.keys.max,upper_cap].min end def extract_callstack_for_multiparameter_attributes(pairs) attributes = { } pairs.each do |pair| multiparameter_name, value = pair attribute_name = multiparameter_name.split("(").first attributes[attribute_name] = {} unless attributes.include?(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