Rails model.valid? flushing custom errors and falsely returning true

Question

I am trying to add a custom error to an instance of my User model, but when I call valid? it is wiping the custom errors and returning true.

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Answer 1

create new concerns

app/models/concerns/static_error.rb

module StaticError
  extend ActiveSupport::Concern

  included do
    validate :check_static_errors
  end

  def add_static_error(*args)
    @static_errors = [] if @static_errors.nil?
    @static_errors << args

    true
  end

  def clear_static_error
    @static_errors = nil
  end

  private

  def check_static_errors
    @static_errors&.each do |error|
      errors.add(*error)
    end
  end
end

include the model

class Model < ApplicationRecord
  include StaticError
end

model = Model.new
model.add_static_error(:base, "STATIC ERROR")
model.valid? #=> false
model.errors.messages #=> {:base=>["STATIC ERROR"]}