Is it possible to refer to ruby class variables in a view?
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3 Answers
The more common approach is to wrap the class variable in a helper method:
# in /app/controllers/foo_controller.rb:
class FooController < ApplicationController
@@bar = 'baz'
def my_action
end
helper_method :bar
def bar
@@bar
end
end
# in /app/views/foo/my_action.html.erb:
It might be a class variable, or it might not, but bar is "<%= bar -%>."
1 Comment
Sam
pretty much the obvious solution, don't know why I didn't opt for this in the first place
Unfortunately class (@@variables) are not copied into the view. You may still be able to get at them via:
controller.instance_eval{@@variable}
or
@controller.instance_eval{@@variable}
or something else less gross.
With Rails, 99.9 out of 100 people should never be doing this, or at least I can't think of a good reason.
1 Comment
Sam
while this isn't what I plan to use, it does answer my original question
Rosen's answer is nice because it hides what kind of variable "bar" is, but if you have a lot of such variables, the need to define a bunch of helper methods is unappealing. I'm using the following in my controller:
@bar = @@bar ||= some_expensive_call
That way, "some_expensive_call" is only made once, and the result is copied into @bar for each instance (so the view can then access it as @bar).
