* Add option to send more form fields in the query.

* Supersedes #159 Add option to send additional fields with the auto complete query. feature

README.md

@@ -262,6 +262,30 @@ If you need to use the id of the selected object, you can use the *id_element* a
 
 This will update the field with id *#some_element with the id of the selected object. The value for this option can be any jQuery selector.
 
+### Sending extra search fields
+
+If you want to send extra fields from your form to the search action,
+you can use the **:fields** options which generates a **data-autocomplete-fields**
+HTML attribute.
+
+The :fields option accepts a hash where the keys represent the Ajax request
+parameter name and the values represent the jQuery selectors to retrieve the
+form elements to get the values:
+
+    f.autocomplete_field :product_name, '/products/autocomplete_product_name', :fields => {:brand_id => '#brand_element', :country => '#country_element'}
+
+    class ProductsController < Admin::BaseController
+      def autocomplete_product_name
+        term = params[:term]
+        brand_id = params[:brand_id]
+        country = params[:country]
+        products = Product.where('brand = ? AND country = ? AND name LIKE ?', brand_id, country, "%term%").order(:name).all
+        render :json => products.map { |product| {:id => product.id, :label => product.name, :value => product.name} }
+      end
+    end
+
+The previous example would fetch the extra attribute slogan and update jQuery('#some_other_element') with the slogan value.
+
 ### Getting extra object data
 
 If you need to extra data about the selected object, you can use the *:update_elements* HTML attribute.

lib/assets/javascripts/autocomplete-rails-uncompressed.js

@@ -53,9 +53,13 @@
 
       jQuery(e).autocomplete({
         source: function( request, response ) {
-          jQuery.getJSON( jQuery(e).attr('data-autocomplete'), {
-            term: extractLast( request.term )
-          }, function() {
+          params = {term: extractLast( request.term )}
+          if (jQuery(e).attr('data-autocomplete-fields')) {
+              jQuery.each(jQuery.parseJSON(jQuery(e).attr('data-autocomplete-fields')), function(field, selector) {
+              params[field] = jQuery(selector).val();
+            });
+          }
+          jQuery.getJSON( jQuery(e).attr('data-autocomplete'), params, function() {
             if(arguments[0].length == 0) {
               arguments[0] = []
               arguments[0][0] = { id: "", label: "no existing match" }

lib/rails3-jquery-autocomplete/form_helper.rb

@@ -33,6 +33,7 @@ def autocomplete_field_tag(name, value, source, options ={})
     #
     private
     def rewrite_autocomplete_option(options)
+      options["data-autocomplete-fields"] = JSON.generate(options.delete :fields) if options[:fields]
       options["data-update-elements"] = JSON.generate(options.delete :update_elements) if options[:update_elements]
       options["data-id-element"] = options.delete :id_element if options[:id_element]
       options

lib/rails3-jquery-autocomplete/simple_form_plugin.rb

@@ -7,6 +7,7 @@ module Autocomplete
       #
       def rewrite_autocomplete_option
         new_options = {}
+        new_options["data-autocomplete-fields"] = JSON.generate(options.delete :fields) if options[:fields]
         new_options["data-update-elements"] = JSON.generate(options.delete :update_elements) if options[:update_elements]
         new_options["data-id-element"] = options.delete :id_element if options[:id_element]
         input_html_options.merge new_options