Ability to assign issues to groups (#2964).

Option is disabled by default. It can be turned on in application settings.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@6306 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/user.rb

@@ -45,7 +45,6 @@ class User < Principal
 
   has_and_belongs_to_many :groups, :after_add => Proc.new {|user, group| group.user_added(user)},
                                    :after_remove => Proc.new {|user, group| group.user_removed(user)}
-  has_many :issue_categories, :foreign_key => 'assigned_to_id', :dependent => :nullify
   has_many :changesets, :dependent => :nullify
   has_one :preference, :dependent => :destroy, :class_name => 'UserPreference'
   has_one :rss_token, :class_name => 'Token', :conditions => "action='feeds'"
@@ -388,6 +387,17 @@ class User < Principal
     @projects_by_role
   end
   
+  # Returns true if user is arg or belongs to arg
+  def is_or_belongs_to?(arg)
+    if arg.is_a?(User)
+      self == arg
+    elsif arg.is_a?(Group)
+      arg.users.include?(self)
+    else
+      false
+    end
+  end
+  
   # Return true if the user is allowed to do the specified action on a specific context
   # Action can be:
   # * a parameter-like Hash (eg. :controller => 'projects', :action => 'edit')
@@ -469,7 +479,7 @@ class User < Principal
       true
     when 'selected'
       # user receives notifications for created/assigned issues on unselected projects
-      if object.is_a?(Issue) && (object.author == self || object.assigned_to == self)
+      if object.is_a?(Issue) && (object.author == self || is_or_belongs_to?(object.assigned_to))
         true
       else
         false
@@ -477,13 +487,13 @@ class User < Principal
     when 'none'
       false
     when 'only_my_events'
-      if object.is_a?(Issue) && (object.author == self || object.assigned_to == self)
+      if object.is_a?(Issue) && (object.author == self || is_or_belongs_to?(object.assigned_to))
         true
       else
         false
       end
     when 'only_assigned'
-      if object.is_a?(Issue) && object.assigned_to == self
+      if object.is_a?(Issue) && is_or_belongs_to?(object.assigned_to)
         true
       else
         false