Off the top of my head:
class Machine < ActiveRecord::Base
# Define a list of acceptable params for filtering
FILTERS = [:name, :code]
# Finds records by params
def self.filter_by_params(params)
conditions = params.select { |key,val| FILTERS.include?(key.to_sym)
and val }
all(:conditions => conditions)
end
end
class MachinesController < ApplicationController
def index
# Where params is { :filter => { :name => 'Pat', :code => '123' }}
@machines = Machine.filter_by_params(params[:filter])
end
end
On Thu, Jul 2, 2009 at 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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