Class-level instance variables not available in view

Question

I have a project with the following:

controller: patient/edit

 def edit
   if current_user.nil?
   redirect_to new_user_session_path
 else
   @states = State.all
   @display_dashboard = true
   @patient
   @foo = 1
 end
end

view patient/edit

<%= @patient.inspect %>
<%= @states.inspect %>
<%= @foo.nil? %>

I run byebug on the edit action and @patient has a value, so does @states. However, I can't see @patient on the view. Any ideas? I'm baffled.

Your edit action is returning @patient? are you setting @patient in a before_action? — Doon
– Doon, Commented Dec 23, 2014 at 18:49
before_action :set_patient, only: [:show,:edit,:update,:destroy,:dashboard,:allergies,:occupations, :information, :revisions] — jamesdlivesinatree
– jamesdlivesinatree, Commented Dec 23, 2014 at 18:51
my before_action allows for :edit, which references @patient — jamesdlivesinatree
– jamesdlivesinatree, Commented Dec 23, 2014 at 18:52
remove @patient from your edit action, and see if that changes anything if it is set in the before_action, then it already exists, and unless you are doing something with it (IE modifying it) no need to reference it in the edit action — Doon
– Doon, Commented Dec 23, 2014 at 18:56

humza · Accepted Answer · 2014-12-23 19:46:47Z

1

@patient doesn't have a value, clearly. If it has a value in the controller action and you've verified this, then you're "emptying" it somewhere in the views.

Change the @patient.inspect to @patient.nil? or @patient.blank? and see if true is displayed.

If you're absolutely certain that the controller value isn't showing up, then do this:

@states = 1

And see if 1 shows up on the view for @states

Perhaps it's some other action altogether.

edited Dec 23, 2014 at 19:46

answered Dec 23, 2014 at 18:48

humza

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4 Comments

jamesdlivesinatree Over a year ago

@patient already has a value within the class. I only put it there to assure there was a value passing through the action. It does indeed have a value

jamesdlivesinatree Over a year ago

i've updated the question. i've included @foo. On the view, @foo shows up as nil, yet @states has a value. Could there be something else in the controller I'm missing?

jamesdlivesinatree Over a year ago

you're right, it still shows as the same value, not 1. We use knockoutjs but I didn't think that could affect a new instance variable i put in the action. I'm still unable to find where it's coming from

jamesdlivesinatree Over a year ago

It ended up being a variable that was drawn from another action (not edit) and that action was not included in the :before_action

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