Dynamically create methods in Controller (RAILS)

Question

I am trying to dynamically create methods for semi static pages. However, the code below does not seem to work. I get a wrong number of arguments (0 for 1) error.

class PagesController < ApplicationController

  pages = %w[ page1 page2 page3 ]

  pages.each do |page|          
    define_method(page) do |a|
      #do nothing
    end
  end
end

Also, what are you trying to achieve with this? It likely has a simpler solution. — Sergio Tulentsev, Jan 26 '16 at 18:37
ArgumentError in PagesController#page1, wrong number of arguments (0 for 1) — user2012677, Jan 26 '16 at 18:38
just trying to define the page methods dynamically. e.g. def page1 end, def page2 end, etc etc. — user2012677, Jan 26 '16 at 18:38
That's __what__ you are doing. But what are you doing this __for__? — Sergio Tulentsev, Jan 26 '16 at 18:39
I think, these methods are for showing static pages. right ? — Anuj, Jan 27 '16 at 09:45

score 5 · Accepted Answer · answered Jan 26 '16 at 18:38

You are saying that the method :page1 (:page2 and :page3 too) have one parameter (a), but controller actions don't have parameters, they receive values from the params hash.

EDIT: Simply remove the |a| from your code:

define_method(page) do
  #do nothing
end

score 2 · Answer 2 · answered Jan 26 '16 at 18:41

2

block without arguments:

class PagesController < ApplicationController

  pages = %w[ page1 page2 page3 ]

  pages.each do |page|          
    define_method(page) do
      #do nothing
    end
  end
end

answered Jan 26 '16 at 18:41

Oleh Sobchuk

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Dynamically create methods in Controller (RAILS)

2 Answers2