Rails fixture incorrectly set values for time field

[dapicester]

I have a model with a time field like this:

class MyModel < ApplicationRecord
  attribute :my_time, :time_only
end

Then in my fixture I set the value like this:

one:
  my_time: "18:00:00"

But when I load the model the field is not set:

instance.my_time
=> nil

Digging a bit deeper I have found that the actual value in the database is this:

instance.my_time_before_type_cast
=> "2000-01-01 18:00:00"

Note that this happens only when using Rails fixtures.

As a quick workaround I added a monkey patch in my initializer:

# config/initializers/tod.rb
if Rails.env.test?
  # Fix for Rails fixtures storing a datetime in time fields.
  # The time value is prepended with the date "2000-01-01".
  module Tod
    class TimeOfDay
      class << self
        old_try_parse = instance_method(:try_parse)

        define_method(:try_parse) do |tod_string|
          tod_string = tod_string.to_s
          tod_string = tod_string[11..] if tod_string.starts_with? "2000-01-01 "
          old_try_parse.bind(self).(tod_string)
        end
      end
    end
  end
end

I wonder if there's a better way to do that.