Can't change instance variable

Rails
1

I have an instance variable @grp:
(app\controllers\zwemmers_controller.rb)
class ZwemmersController < ApplicationController
…
def initialize
@grp=‘or1r2r3r4gggrp’
end
attr_accessor :grp
…
end

When i click an image, i reload the main index page and try to change
the value of the variable:
(app\views\layouts\zwemmers.html.erb)

…
<%= link_to image_tag(“oranje.png”, :mouseover =>
image_path(“oranje2.png”), :grp => ‘o’), zwemmers_path %>
…

The value doesn’t change. any ideas?

2

On Feb 7, 2:19pm, Kelly P. [email protected] wrote:

I have an instance variable @grp:
(app\controllers\zwemmers_controller.rb)
class ZwemmersController < ApplicationController
…
def initialize
@grp=‘or1r2r3r4gggrp’
end

In general I’d be wary of overriding initialize without calling super
(i think you’re ok here though)

image_path(“oranje2.png”), :grp => ‘o’), zwemmers_path %>
…

The value doesn’t change. any ideas?

You haven’t shown anywhere where you’re trying to set it - if you want
it to be set based on a parameter, you’re going to have to set @grp to
params[:something]

Fred

3

Frederick C. wrote in post #980057:

You haven’t shown anywhere where you’re trying to set it - if you want
it to be set based on a parameter, you’re going to have to set @grp to
params[:something]

Hm, i forgot the on_click in my code:
<%= link_to image_tag(“oranje.png”, :mouseover =>
image_path(“oranje2.png”), :onclick => (:grp => ‘o’)), zwemmers_path %>

So when i click the image i want to redirect to zwemmers_path and i want
to change the value of @grp to ‘o’. I don’t know how to implement params
tho.

4

K thanks for the responses, i will do some reading on params. Didn’t
know changing the value of an instance variable is this complicated.

5

On 7 February 2011 14:51, Kelly P. [email protected] wrote:

image_path(“oranje2.png”), :onclick => (:grp => ‘o’)), zwemmers_path %>

So when i click the image i want to redirect to zwemmers_path and i want
to change the value of @grp to ‘o’. I don’t know how to implement params
tho.

If you don’t know about passing data back to the controller via params
then you need to run through some basic guides and tutorials. See the
Rails Guides (google it) and railstutorial.org is good.

Make sure that any tutorial you use matches the rails version you are
using (2 or 3). I would advise using Rails 3 unless you are to
maintain legacy apps.

Colin

6

On 7 February 2011 15:50, Kelly P. [email protected] wrote:

K thanks for the responses, i will do some reading on params. Didn’t
know changing the value of an instance variable is this complicated.

It isn’t complicated, most things seem complicated till you know how
and have had a bit of practice :slight_smile:

Colin