Using wrong namespace in the Rails controller

Question

I have a controller: "/app/controllers/analyst/test_orders_controller.rb".

In this file I have:

class Analyst::TestOrdersController < ApplicationController
  def new
    @order = Order.new
  end
end

But I have an error:

uninitialized constant Analyst::TestOrdersController::Order

But I don't want to use Analyst::TestOrdersController::Order.new, I just want to use Order.new. It is strange. What is the problem?

@Marek_Lipka, Yea, of course. I have about 30 controllers which use this class. — Maxim Abramchuk
– Maxim Abramchuk, Commented Dec 9, 2014 at 14:52
@dax, I know this solution, but I think it is just a hack. And what is the matter of this strange behavior? — Maxim Abramchuk
– Maxim Abramchuk, Commented Dec 9, 2014 at 14:53

Ronna · Accepted Answer · 2014-12-09 19:33:04Z

3

Use ::Order.new The interpreter is looking for the definition of Order under the Analyst module namespace, this happens because the application models are loaded lazily so the file models/order.rb has not been read yet. Adding the general namespace tells it search for the definition in the Rails paths.

The way to confirm this is to add some random function call in the Order model body and see that it's not executed unless you call ::Order explicitly.

edited Dec 9, 2014 at 19:33

answered Dec 9, 2014 at 19:27

Ronna

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Comments

DGM · Accepted Answer · 2014-12-09 15:02:45Z

1

try:

module  Analyst
  class TestOrdersController < ApplicationController
    def new
      @order = Order.new
    end
  end
end

I think it has to do with module nesting: https://cirw.in/blog/constant-lookup

answered Dec 9, 2014 at 15:02

DGM

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