method

write_attribute

Ruby on Rails latest stable (v6.1.7.7) - 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
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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
What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v2.3.8) is shown here.

These similar methods exist in v6.1.7.7:

ActiveRecord::AttributeMethods::Write#write_attribute

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 313
    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

Method deprecated or moved

can be useful to achieve attr_reader effect

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