Cannot redirect to nil! - basic MVC operation

rubyonrails-talk
1

(I'm having some hard time for days to manage to chose a random item from teh database and to be able to pass it further.)

It is basic operation and i tried several ways all, brought me to the same problem, params {"id" = "random"} <- the name of the controller method

controller:

def random # method works checked it in the console. Returns a valid obj.       @task = Task.find(rand(Task.first.id..Task.last.id))       render "random"     end

random.html.erb        <%= @task %> # i want it to make it work, if i pass manually lets #say `../random/1` lets say as an example it works it shows me the memory #location of the object.

error log:

ActionController::ActionControllerError in TasksController#show Cannot redirect to nil!

Rails.root: /home/bogdan/ex/bored Application Trace | Framework Trace | Full Trace

actionpack (3.2.3) lib/action_controller/metal/redirecting.rb:60:in `redirect_to' actionpack (3.2.3) lib/action_controller/metal/flash.rb:25:in `redirect_to' actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:60:in `block in redirect_to' activesupport (3.2.3) lib/active_support/notifications.rb:123:in `block in instrument' activesupport (3.2.3) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (3.2.3) lib/active_support/notifications.rb:123:in `instrument' actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:59:in `redirect_to' actionpack (3.2.3) lib/action_controller/metal/implicit_render.rb:4:in `send_action' actionpack (3.2.3) lib/abstract_controller/base.rb:167:in `process_action' . . . (only the top of the stack)

Request

Parameters:

{"id"=>"random"}

2

controller:

def random       @task = Task.find(rand(Task.first.id..Task.last.id))       # REMOVE - UNNECESSARY render "random"     end

random.html.erb        <%= @task %> # i want it to make it work, if i pass manually lets #say `../random/1` lets say as an example it works it shows me the memory #location of the object.

@task.inspect would be more useful, or actually displaying some specific attributes of the object :slight_smile:

error log:

ActionController::ActionControllerError in TasksController#show Cannot redirect to nil!

But here, you're not even using your "random" method, you're calling "show" -- check your routes.

3

well you are not using rest routes. it should look like : yourapp/tasks/4 rails would understand 4 as the param .