how to reuse same set of validations on different columns and different models

k0k0 0
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We have same set of validations on different fields. we have fee columns. with the following validations

validates :sytem_fee, presence: true, 
                      format: { with: fee_regex, message: format_error_message }, 
                      numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 40 }
validates :sytem_discounted_fee, presence: true, 
                                 format: { with: fee_regex, message: format_error_message }, 
                                 numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 40 }

The set of validations applied to the columns is basically the same. we have also the fees in different models. They have the same validations basicaly. I know that there are custom validators like: EmailValidator < ActiveModel::EachValidator

My question is: can we create a custom validator that uses the default validations like presence, numericallity and so on?

The idea is to be able to say validates some_fee, percent_fee_column: truein any model

ruby-on-rails validation
1 Answers

You can put your method in the app/models/concerns folder, for example, as Validatable module (i.e. validatable.rb):

module Concerns::Validatable
  extend ActiveSupport::Concern

  def format_website
    if website.blank?
      self.website = nil
    elsif !self.website[/^https?/]
      self.website = "http://#{self.website}"
    end
  end

end

And then include it in each models as

include Concerns::Validatable
Divyaraj Solanki0
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