How are values cast when assigning to a Boolean field in Rails ActiveRecord?

Question

Short version of my question

In Rails ActiveRecord, if I have a Boolean field and I assign it something like \"abc\" or 2, the

Answer 1

The behavior of boolean columns changed with two commits:

• e01a46f (2014-10-17)
• a502703 (2015-01-04).

The new rule is very simple. See the code below:

module ActiveRecord
  module Type
    class Boolean < Value # :nodoc:
      def type
    :boolean
      end

      private

      def cast_value(value)
    if value == ''
      nil
    else
      !ConnectionAdapters::Column::FALSE_VALUES.include?(value)
    end
      end
    end
  end
end

The constant ConnectionAdapters::Column::FALSE_VALUES is defined as follows:

[false, 0, '0', 'f', 'F', 'false', 'FALSE', 'off', 'OFF'].to_set

If a value is not an empty string and is not among them, it will be cast to true.

This change will become effective on the Rails 5.0.