method

write_attribute

v2.2.1 - Show latest stable - 1 note - Class: ActiveRecord::AttributeMethods

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0 (0)
2.2.1 (0)
2.3.8 (0)
3.0.0
3.0.9
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2
4.1.8
4.2.1
4.2.7
4.2.9
5.0.0.1
5.1.7
5.2.3
6.0.0
6.1.3.1
6.1.7.7
7.0.0
7.1.3.2
7.1.3.4
What's this?

write_attribute(attr_name, value) public

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

Show source

# File activerecord/lib/active_record/attribute_methods.rb, line 309
    def write_attribute(attr_name, value)
      attr_name = attr_name.to_s
      @attributes_cache.delete(attr_name)
      if (column = column_for_attribute(attr_name)) && column.number?
        @attributes[attr_name] = convert_number_column_value(value)
      else
        @attributes[attr_name] = value
      end
    end

October 30, 2008

1 thank

can be useful to achieve attr_reader effect

e.g.

class Account < ActiveRecord::Base 

  def credit(amount)
    self.write_attribute(:balance, self.balance + amount)
    self.save!
  end

  def balance=(value)
    raise "You can't set this attribute. It is private."
  end

end

this allows fred.account.credit(5) whilst raising an error on fred.account.balance = 1000

write_attribute

Related methods

can be useful to achieve attr_reader effect