Added nested field selector support to LinkedIn::Api::QueryMethods

lib/linked_in/api/query_methods.rb

@@ -51,7 +51,7 @@ def simple_query(path, options={})
           if options.delete(:public)
             path +=":public"
           elsif fields
-            path +=":(#{fields.map{ |f| f.to_s.gsub("_","-") }.join(',')})"
+            path += field_selector(fields)
           end
 
           headers = options.delete(:headers) || {}
@@ -87,6 +87,24 @@ def company_path(options)
           end
         end
 
+        def field_selector(fields)
+          result = ":("
+          fields = fields.to_a.map do |field|
+            if field.is_a?(Hash)
+              innerFields = []
+              field.each do |key, value|
+                innerFields << key.to_s.gsub("_","-") + field_selector(value)
+              end
+              innerFields.join(',')
+            else
+              field.to_s.gsub("_","-")
+            end
+          end
+          result += fields.join(',')
+          result += ")"
+          result
+        end
+
     end
 
   end