task-assignment-permissions

The stories, tasks and task assignments associated with the project
need permissions similar to that of their containing project.  Let's
set their permission to check their containing project:

SHOW_PATCH

app/models/story.rb

@@ -19,15 +19,15 @@ class Story < ActiveRecord::Base
   # --- Permissions --- #
 
   def create_permitted?
-    acting_user.administrator?
+    project.creatable_by?(acting_user)
   end
 
   def update_permitted?
-    acting_user.signed_up? && !project_changed?
+    project.updatable_by?(acting_user)
   end
 
   def destroy_permitted?
-    acting_user.administrator?
+    project.destroyable_by?(acting_user)
   end
 
   def view_permitted?(field)

app/models/task.rb

@@ -18,15 +18,15 @@ class Task < ActiveRecord::Base
   # --- Permissions --- #
 
   def create_permitted?
-    acting_user.administrator?
+    story.creatable_by?(acting_user)
   end
 
   def update_permitted?
-    acting_user.signed_up? && !story_changed?
+    story.updatable_by?(acting_user)
   end
 
   def destroy_permitted?
-    acting_user.administrator?
+    story.destroyable_by?(acting_user)
   end
 
   def view_permitted?(field)

app/models/task_assignment.rb

@@ -13,19 +13,19 @@ class TaskAssignment < ActiveRecord::Base
   # --- Permissions --- #
 
   def create_permitted?
-    acting_user.administrator?
+    task.creatable_by?(acting_user)
   end
 
   def update_permitted?
-    acting_user.administrator?
+    task.updatable_by?(acting_user)
   end
 
   def destroy_permitted?
-    acting_user.administrator?
+    task.destroyable_by?(acting_user)
   end
 
   def view_permitted?(field)
-    true
+    task.viewable_by?(acting_user)
   end
 
 end