Validators don't see custom I18n errors about validations

[AlfonsoUceda]

@BenBach Almost hehe, that message is because custom predicates need custom error messages, so you need to create a validator class and use the predicate inside the validator. The problem is because we have to improve that API.

module MyPredicates
  include Hanami::Validations::Predicates

  self.messages_path = 'config/errors.yml'

  predicate(:uuid?) do |input|
    !/[0-9a-f]{8}-
    [0-9a-f]{4}-
    [0-9a-f]{4}-
    [0-9a-f]{4}-
    [0-9a-f]{12}/x.match(input).nil?
  end
end

class CustomValidator
  include Hanami::Validations
  predicates MyPredicates

  validations do
    required(:id).filled(:uuid?)
  end
end

module Web::Controllers::Home
  class Index
    include Web::Action

    params Signup

    def call(params)
      result = params.validate
    end
  end
end

Adapt it to your code and tell me if it works.

[rodrigopk]

@jodosha @AlfonsoUceda Hi, I work on the same company as @BenBach.
I tested the solution proposed by @AlfonsoUceda, and it works like a charm.
Thanks for the help!

[BenBach]

@jarosluv Were you able to solve this? I have the exact same issue. The customer error messages of my customer predicates aren't found

[jarosluv]

@BenBach

Hello, Ben!

With help of @flash-gordon, it was possible to get workaround:

module Web::Controllers::Campaigns
  class Create
    ...
    params do
      configure do
        config.messages = :i18n
      end

      required(:campaign).schema(CampaignSchema)
    end
    ...
  end
end

CampaignSchema = Dry::Validation.Form do
  required(:title).filled

  validate correct_title?: :title do |title|
    TitleHandler.call(title)
  end
end

[juanibiapina]

I got the same problem with this setup:

module MyPredicates
  self.messages_path = "yaml with message for `whatever` predicate"

  predicate :whatever? do |current|
    current == "whatever"
  end
end

class Parent
  include Hanami::Validations::Form

  validations do
    required(:child).schema(Child)
  end
end

class Child
  include Hanami::Validations::Form

  predicates MyPredicates

  validations do
    required(:field).filled(:whatever?)
  end
end

Dry::Validation::MissingMessageError:
       message for whatever? was not found

The fix then becomes including predicates MyPredicates on the Parent. Even though predicates are not used there, messages seem to be read from that level.

[AlfonsoUceda]

@juanibiapina you can fix it including predicates in Child class as workaround.

[AlfonsoUceda]

@jarosluv thank you for reporting this and sorry for the late answer, we are working in the fix because the workaround is ok but it isn't good if you have to add in every action you use that schema.

[BenBach]

@AlfonsoUceda Thanks. This is not fixed in hanami 1.1.0 right?

[AlfonsoUceda]

@BenBach no sorry, but I wanted to fix it maybe for 1.1.1, just I need time :P

[BenBach]

@AlfonsoUceda No problem at all.

I am just wondering how to do a workaround:

# frozen_string_literal: true

require 'hanami/validations'

module MyCompany::Predicates
  include Hanami::Validations::Predicates

  self.messages_path = 'config/errors.yml'

  predicate(:uuid?) do |input|
    !/[0-9a-f]{8}-
    [0-9a-f]{4}-
    [0-9a-f]{4}-
    [0-9a-f]{4}-
    [0-9a-f]{12}/x.match(input).nil?
  end
end

module Api::Controllers::Customers
  class Destroy
    include Api::Action


    params do
      predicates MyCompany::Predicates

      required(:id).filled(:str?, :uuid?)
    end
end

Do you maybe have a hint?

My specs fail right now with:

Dry::Validation::MissingMessageError:
       message for uuid? was not found

[AlfonsoUceda]

I'll take a look this weekend ;)

[jodosha]

@BenBach Can you please verify? TYVM.

[BenBach]

@AlfonsoUceda Thanks a lot!!

[AlfonsoUceda]

Thanks both to use Hanami, we want to improve hanami validations because it is in our roadmap.

[jodosha]

Folks, thank you all. I'm closing this. I also documented the usage: hanami/hanami.github.io#418

[xvonabur]

@jodosha Hi! Just my two cents. There is still issue with predicates and i18n. config.message_file is working fine, but config.messages = :i18n is not. The only way to use custom predicates with i18n errors is to add

params do
  configure do
    config.messages = :i18n
  end
end

to controller (as mentioned above). I'm on 1.1.0 right now. Is it true for master branch? If so, I can send a PR to hanami docs to mention it, if you wish. I've lost so much time to figure it out, so I want to help others.