method

write_attribute

v2.1.0 - Show latest stable - 1 note - Class: ActiveRecord::AttributeMethods

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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 305
    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

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can be useful to achieve attr_reader effect

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