Accessing Instance Variables

Question

I am just looking to seek some clarification to accessing Instance variables within its class (apologies if this is really basic).

My example is that I have a recipe controller and within it I have many actions but in paticular I have an INDEX and a SHOW action

def index
@q = Recipe.search(params[:q])
@q.build_condition
end

@q searches my Recipe model based on the params passed through my search form

i want to show the results on a different page to start (will look at AJAX option later), so in my SHOW action could I do this

 def show
 @searchresults = @q.result(:distinct => true)
 end

I think this is valid but if not I am going wrong somewhere. Can anyone advise or offer some constructive advice?

Thank you

Teddy · Accepted Answer · 2012-12-07 13:45:19Z

3

your object or class should have the following methods:

@foo.instance_variables - this will list the names of the instance variables for @foo
@foo.instance_variable_get - this will get the value of an instance variable for @foo
- ex: @foo.instance_variable_get("@bar") - this would get the value of the instance variable named @bar for @foo

answered Dec 7, 2012 at 13:45

Teddy

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Salil · Accepted Answer · 2012-12-07 13:45:41Z

1

No you can't use instance variable like this because they both have different action and will get called for the different request.

However following will work

def index
  @q = Recipe.search(params[:q])
  @q.build_condition
  show
end

def show
  #Following line will work as we are calling this method in index 
  #and so we can use instance variable of index method in the show methos 
  @searchresults = @q.result(:distinct => true)
end

answered Dec 7, 2012 at 13:45

Salil

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1 Comment

Richlewis Over a year ago

thank you for your answer, so if for example i placed search results instance variable within a results action i would just call results in my index..think you have cleared things up for me here

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