Prevent one query per User#member_of? call after r11508 (#13301).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11605 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/user.rb

@@ -454,7 +454,7 @@ class User < Principal
 
   # Return true if the user is a member of project
   def member_of?(project)
-    roles_for_project(project).any? {|role| role.member?}
+    projects.to_a.include?(project)
   end
 
   # Returns a hash of user's projects grouped by roles
@@ -704,6 +704,10 @@ class AnonymousUser < User
     UserPreference.new(:user => self)
   end
 
+  def member_of?(project)
+    false
+  end
+
   # Anonymous user can not be destroyed
   def destroy
     false