[Rietveld] Add support for patchset dependencies

appengine/chromium_rietveld/codereview/models.py

 # Copyright 2008 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 595 matching lines @@
   issue_key = ndb.KeyProperty(name='issue', kind=Issue)  # == parent
   message = ndb.StringProperty()
   data = ndb.BlobProperty()
   url = ndb.StringProperty()
   created = ndb.DateTimeProperty(auto_now_add=True)
   modified = ndb.DateTimeProperty(auto_now=True)
   n_comments = ndb.IntegerProperty(default=0)
   # TODO(maruel): Deprecated, remove once the live instance has all its data
   # converted to TryJobResult instances.
   build_results = ndb.StringProperty(repeated=True)
+  depends_on_patchset = ndb.StringProperty()
+  dependent_patchsets = ndb.StringProperty(repeated=True)
 
   @property
   def num_patches(self):
     """Return the number of patches in this patchset."""
     return Patch.query(ancestor=self.key).count(
       settings.MAX_PATCHES_PER_PATCHSET)
 
   @property
   def patches(self):
     def reading_order(patch):
@@ skipping 1203 matching lines @@
   out.issues = sum((i.issues for i in items), [])
   out.latencies = sum((i.latencies for i in items), [])
   out.lgtms = sum((i.lgtms for i in items), [])
   out.review_types = sum((i.review_types for i in items), [])
   out.score = compute_score(out)
   return (
       prev_issues != out.issues or
       prev_latencies != out.latencies or
       prev_lgtms != out.lgtms or
       prev_review_types != out.review_types)