How to cause manually ActiveRecord RecordInvalid in Rails - ruby-on-rails

Question

Entry: I have attribute class that derive from one of the ActiveRecord types and implement method cast(value) which transforms provided value to derived Active Record type. In our case we perform transformation only when the provided value is a String otherwise the default integer casting is performed. Private method to_minutes converts formatted time to an integer representing spent minutes. I assumed that 1d = 8h = 480m. E.g. result of to_minutes('1d 1h 1m') = 541. (I used this resource Custom Attributes in Ruby on Rails 5 ActiveRecord
If the string that came has no numbers, I need to return a validation error, and set this error to the #card.errors. How should I do it? I try:
if time.scan(/\d/).empty?
raise ActiveRecord::RecordInvalid.new(InvalidRecord.new)
end
But it does not work, I get an error
NameError in CardsController#update
uninitialized constant CardDuration::Type::InvalidRecord
Extracted source (around line #15):
I create my own attribute for integer type:
class CardDuration
class Type < ActiveRecord::Type::Value
def cast(value)
if value.is_a?(String)
to_seconds(value)
else
super
end
end
private
def to_seconds(time)
if time.scan(/\d/).empty?
return raise ActiveRecord::RecordInvalid.new, { errors: {message: 'Duration is too short (minimum is 1 number)'} }
end
time_sum = 0
time.split(' ').each do |time_part|
value = time_part.to_i
type = time_part[-1,1]
case type
when 'm'
value
when 'h'
value *= 60
when 'd'
value *= 8*60
else
value
end
time_sum += value
end
time_sum
end
end
end
and inside model:
class Card < ApplicationRecord
validates :duration, length: { within: 0..14880 }
attribute :duration, CardDuration::Type.new
end
Also validation doesn't work, and I do not understand why.
Thanks)
Inside controller this field can only be updated, so I need set the error to the #card.errors:
class CardsController < ApplicationController
def update
if #card.update(card_params)
flash[:success] = "Card was successfully updated."
else
flash[:error] = #card.errors.full_messages.join("\n")
render status: 422
end
rescue ActiveRecord::RecordInvalid => e
return e.record
end
end

Answer 1

in ActiveRecord::RecordInvalid.new(...) you need to pass structure, which have method 'errors' documentation.
try to raise ActiveRecord::RecordInvalid.new(self.new)
or write or own class, with method errors, which will be handle your exeptions

Answer 2

The only problem that I can see in your code is the way you're raising the invalid record error.
The correct way to do that would be-
raise ActiveRecord::RecordInvalid