ActiveRecord RecordNotFound Error

Question

I created a CRUD using the scaffold .

rails g scaffold intermediate_level/memory_game 

And then I created the method Play, but when I call the method play an error is returned. http://localhost:3000/intermediate_level/memory_game/play?id=1

Couldn't find IntermediateLevel::MemoryGame with 'id'=play
    # Use callbacks to share common setup or constraints between actions.
    def set_intermediate_level_memory_game
      @intermediate_level_memory_game = IntermediateLevel::MemoryGame.find(params[:id])
    end

---

def play {
       @intermediate_level_memory_game = IntermediateLevel::MemoryGame.find(params[:id])
    }

My routes.file

namespace :intermediate_level do
    resources :memory_game
    get 'memory_game/play' 
  end

Answer 1

Your custom get 'memory_game/play should come before resources :memory_game . Rails evaluates routes in the order in which they are listed in the routes.rb file, with the routes closest to the top of the file receiving the highest priority.

Answer 2

With your given routes information:

  namespace :intermediate_level do
    resources :memory_game
    get 'memory_game/play'
  end

You have these two routes:

GET    /intermediate_level/memory_game/:id(.:format)      intermediate_level/memory_game#show

and

GET    /intermediate_level/memory_game/play(.:format)     intermediate_level/memory_game#play

When you make this request:

http://localhost:3000/intermediate_level/memory_game/play?id=1

it is matched by both of those routes and as you defined: resources :memory_game before get 'memory_game/play' in your routes.rb file, so the first one ( GET /intermediate_level/memory_game/:id ) comes into action as that has higher priority, ( because Routes have priority defined by the order of appearance of the routes in the config/routes.rb file ) and then it tries to find the memory game with id param which in that case is play but fails to do so (as you don't have any memory game where id=play ) and fails with the error message:

Couldn't find IntermediateLevel::MemoryGame with 'id'=play

One quick way to get around this issue is to reorder your routes like this:

  namespace :intermediate_level do
    get 'memory_game/play'
    resources :memory_game
  end 

Then, your request url http://localhost:3000/intermediate_level/memory_game/play?id=1 will be served by GET /intermediate_level/memory_game/play(.:format) intermediate_level/memory_game#play route which is what you want.