Module: ActiveRecord::AttributeMethods::Write

Extended by:
ActiveSupport::Concern
Defined in:
activerecord/lib/active_record/attribute_methods/write.rb

Defined Under Namespace

Modules: ClassMethods

Constant Summary collapse

WriterMethodCache = 
Class.new(AttributeMethodCache) {
  private

  def method_body(method_name, const_name)
    <<-EOMETHOD
    def #{method_name}(value)
      name = ::ActiveRecord::AttributeMethods::AttrNames::ATTR_#{const_name}
      write_attribute(name, value)
    end
    EOMETHOD
  end
}.new

Instance Method Summary collapse

Methods included from ActiveSupport::Concern

append_features, extended, included

Instance Method Details

#write_attribute(attr_name, value) ⇒ Object Also known as: raw_write_attribute

Updates the attribute identified by attr_name with the specified value. Empty strings for fixnum and float columns are turned into nil.



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# File 'activerecord/lib/active_record/attribute_methods/write.rb', line 57

def write_attribute(attr_name, value)
  attr_name = attr_name.to_s
  attr_name = self.class.primary_key if attr_name == 'id' && self.class.primary_key
  @attributes_cache.delete(attr_name)
  column = column_for_attribute(attr_name)

  # If we're dealing with a binary column, write the data to the cache
  # so we don't attempt to typecast multiple times.
  if column && column.binary?
    @attributes_cache[attr_name] = value
  end

  if column || @attributes.has_key?(attr_name)
    @attributes[attr_name] = type_cast_attribute_for_write(column, value)
  else
    raise ActiveModel::MissingAttributeError, "can't write unknown attribute `#{attr_name}'"
  end
end