Redefine #find_every to stitch together large Shopify queries where count > 250 into multiple calls.

base.rb

# Example usage
begin
  rs = ShopifyAPI::Order.all
rescue ShopifyAPI::Limits::Error
  # Not enough credits to execute this request.  Queue to DJ here, perhaps??
end

##
# Redefines #find_every to automatically compose resultsets from multiple ShopifyAPI queries due to API limit of 250 records / request.
# Seemlessly stitches all requests to #all, #find(:all), etc, as if there were no LIMIT.
# @see http://wiki.shopify.com/Retrieving_more_than_250_Products%2C_Orders_etc.
#
module ActiveResource
  class Base     
    QUERY_LIMIT = 250
                    
    class << self
      # get reference to unbound class-method #find_every
      find_every = self.instance_method(:find_every)
      
      define_method(:find_every) do |options|
        options[:params] ||= {}
        
        pages = (count(options)/QUERY_LIMIT).ceil
        
        raise ShopifyAPI::Limits::Error.new unless ShopifyAPI.credits_left >= pages
        
        rs = []
        # Iterate from 1 -> max-pages and call the original #find_every, capturing the responses into one list
        1.upto(pages) {|page| 
          options[:params][:page] = page
          rs.concat find_every.bind(self).call(options)
        }
        rs
      end
    end      
  end
end