Added a 'Assignable' boolean on Role model.

If unchecked, issues can not be assigned to users having this role.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@649 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -59,6 +59,11 @@ class Issue < ActiveRecord::Base
     if start_date && soonest_start && start_date < soonest_start
       errors.add :start_date, :activerecord_error_invalid
     end
+    
+    # validate assignment
+    if assigned_to && !assignable_users.include?(assigned_to)
+      errors.add :assigned_to_id, :activerecord_error_invalid
+    end
   end
   
   def before_create
@@ -105,6 +110,11 @@ class Issue < ActiveRecord::Base
     @current_journal
   end
   
+  # Users the issue can be assigned to
+  def assignable_users
+    project.members.select {|m| m.role.assignable?}.collect {|m| m.user}
+  end
+  
   def spent_hours
     @spent_hours ||= time_entries.sum(:hours) || 0
   end