You could try building up a chain of scopes - see this post:
http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/a7df6a8b9628bb4b/d6b738f83084ec91?lnk=gst&q=scoped#d6b738f83084ec91
As noted there, you can avoid cluttering up your model by using
'scoped' to create anonymous scopes.
So your example would look like:
# in the controller action
proxy = Machine
[:attr1, :attr2, :attr3].each do { |k|
proxy = proxy.scoped(:conditions => Hash[k, params[k]]) unless params
[k].blank?
}
@machines = proxy.find(:all)
That last find can also be a paginate, have limits, sorts, etc.
--Matt Jones
On Jul 2, 5:42 pm, jhaagmans <[email protected]> wrote:
> In an app I'm working on, I want to have a filter in which you can
> specify certain attributes and click "filter" to activate an AJAX
> request and return a list of, say, machines that match with those
> attributes.
>
> No I'm not sure how to build the controller.
>
> If I would specify all the attributes, I would simply do:
>
> def filter
> @machines = Machine.find(:all, :conditions => { :attr_1 => params
> [:attr_1], :attr_2 ... }
> end
>
> But how would I do this if only some of the attributes are specified
> and the others are nil? Would I have to create @machines including all
> machines and have Rails do the rest of the work or is there a way to
> get find to do what I want?
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