method

field_changed?

v3.0.0 - Show latest stable - 0 notes - Class: ActiveRecord::AttributeMethods::Dirty

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0
2.2.1
2.3.8
3.0.0 (0)
3.0.9 (0)
3.1.0 (0)
3.2.1 (0)
3.2.8 (0)
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?

field_changed?(attr, old, value) private

No documentation

This method has no description. You can help the Ruby on Rails community by adding new notes.

# File activerecord/lib/active_record/attribute_methods/dirty.rb, line 74
      def field_changed?(attr, old, value)
        if column = column_for_attribute(attr)
          if column.number? && column.null && (old.nil? || old == 0) && value.blank?
            # For nullable numeric columns, NULL gets stored in database for blank (i.e. '') values.
            # Hence we don't record it as a change if the value changes from nil to ''.
            # If an old value of 0 is set to '' we want this to get changed to nil as otherwise it'll
            # be typecast back to 0 (''.to_i => 0)
            value = nil
          else
            value = column.type_cast(value)
          end
        end

        old != value
      end

field_changed?

Related methods

No documentation