Create a concern to use when using uuid as default primary key

readme.md

When you use uuid some methods stop to work as expected. Using this concern in your models will do the job. All you need to do is:

1 - Copy this file to models/concerns 2 - In all your models use this concern just, like this

class Client < ActiveRecord::Base
	include Findable
end

Findable.rb

module Findable
  extend ActiveSupport::Concern
  # When you use uuid some methods stop to work as expected. Using this concern in your models will do the job.
  # Override methods on module FinderMethods that use id as default order when no order is defined
  # It's a working in progress
  # referencer:
  # http://api.rubyonrails.org/classes/ActiveRecord/FinderMethods.html#method-i-take
  # https://github.com/rails/rails/blob/f52354ad1d15120dcc5284714bee7ee3f052986c/activerecord/lib/active_record/relation/finder_methods.rb#L503

  module ClassMethods

    def first(limit = nil)
      self.order("created_at").first(limit)
    end

    def first!
      self.order("created_at").first!
    end

    def second
      self.order("created_at").second
    end

    def second!
      self.order("created_at").second!
    end

    def third
      self.order("created_at").third
    end

    def third!
      self.order("created_at").third!
    end

    def fourth
      self.order("created_at").fourth
    end

    def fourth!
      self.order("created_at").fourth!
    end

    def fifth
      self.order("created_at").fifth
    end

    def fifth!
      self.order("created_at").fifth!
    end

    def forty_two
      self.order("created_at").forty_two
    end

    def forty_two!
      self.order("created_at").forty_two!
    end

    def last(limit = nil)
      self.order("created_at DESC").last(limit)
    end

    def last!
      self.order("created_at DESC").last!
    end

  end

end

I forked with a version of find_in_batches.

@lypborges
Any reason default_scope { order(:created_at) } wouldn't work?

This seems to be working well for me:

module PrimaryUuidKey
  extend ActiveSupport::Concern

  included do
    after_initialize :set_id
    self.primary_key = :id
    default_scope { order(:created_at) }
    validates :id, uniqueness: true
  end

  def set_id
    self.id ||= SecureRandom.uuid
  end

end