Undefine dynamic methods on removing last role.

Author: sampatbadhe

lib/rolify/dynamic.rb

@@ -3,14 +3,26 @@
 module Rolify
   module Dynamic
     def define_dynamic_method(role_name, resource)
-      class_eval do 
-        define_method("is_#{role_name}?".to_sym) do
-          has_role?("#{role_name}")
-        end if !method_defined?("is_#{role_name}?".to_sym) && self.adapter.where_strict(self.role_class, name: role_name).exists?
+      class_eval do
+        if self.adapter.where_strict(self.role_class, name: role_name).exists?
+          if !method_defined?("is_#{role_name}?".to_sym)
+            define_method("is_#{role_name}?".to_sym) do
+              has_role?("#{role_name}")
+            end
+          end
+        else
+          undef_method("is_#{role_name}?".to_sym) if method_defined?("is_#{role_name}?".to_sym)
+        end
 
-        define_method("is_#{role_name}_of?".to_sym) do |arg|
-          has_role?("#{role_name}", arg)
-        end if !method_defined?("is_#{role_name}_of?".to_sym) && resource && self.adapter.where_strict(self.role_class, name: role_name, resource: resource).exists?
+        if resource && self.adapter.where_strict(self.role_class, name: role_name, resource: resource).exists?
+          if !method_defined?("is_#{role_name}_of?".to_sym)
+            define_method("is_#{role_name}_of?".to_sym) do |arg|
+              has_role?("#{role_name}", arg)
+            end
+          end
+        else
+          undef_method("is_#{role_name}_of?".to_sym) if method_defined?("is_#{role_name}_of?".to_sym)
+        end
       end
     end
   end

lib/rolify/role.rb

@@ -80,6 +80,7 @@ def only_has_role?(role_name, resource = nil)
 
     def remove_role(role_name, resource = nil)
       self.class.adapter.remove(self, role_name.to_s, resource)
+      self.class.define_dynamic_method(role_name, resource) if Rolify.dynamic_shortcuts
     end
 
     alias_method :revoke, :remove_role
@@ -101,7 +102,7 @@ def method_missing(method, *args, &block)
     def respond_to?(method, include_private = false)
       if Rolify.dynamic_shortcuts && (method.to_s.match(/^is_(\w+)_of[?]$/) || method.to_s.match(/^is_(\w+)[?]$/))
         query = self.class.role_class.where(:name => $1)
-        if query
+        if query.exists?
           query = self.class.adapter.exists?(query, :resource_type) if method.to_s.match(/^is_(\w+)_of[?]$/)
           return query.count > 0
         end