Redmine

how to patch AR validation correctly?
model Issue validates_length_of :subject, :maximum => 255

my code

module IssuesPatch
  def self.included(base)
    base.class_eval do
      validates_length_of :subject, :maximum => 1_000
      end
  end

end

Rails.configuration.after_initialize do
  require_dependency 'issue'
  Issue.send(:include, IssuesPatch)
end

after Issue.create(subject: "Long string...").errors:
:subject=>["is too long (maximum is 255 characters)", "is too long (maximum is 1000 characters)"]}

as far as I understand, you need to remove the old validation? or patch it?
how to do it?

Redmine version                4.1.1.stable
  Ruby version                   2.6.6-p146 (2020-03-31) [x64-mingw32]
  Rails version                  5.2.4.2