[Findit] scripts to calculate confidence level of Findit results.

appengine/findit/model/suspected_cl_confidence.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from google.appengine.ext import ndb
 
 from common.time_util import GetUTCNow
 from model.versioned_model import VersionedModel
 
+
 class ConfidenceInformation(ndb.Model):
   correct = ndb.IntegerProperty()
   total = ndb.IntegerProperty()
   confidence = ndb.FloatProperty()
 
   # score is specific for confidence of heuristic results.
   score = ndb.IntegerProperty(default=None)
 
   def ToDict(self):
     dict_format = {
@@ skipping 15 matching lines @@
       a. The score has been further refined by the top score of hints.
   2. CLs for compile failures found by Try Job approach.
   3. CLs for compile failures found by both approaches.
   4. CLs for test failures found by Heuristic approach.
       a. The score has been further refined by the top score of hints.
   5. CLs for test failures found by Try Job approach.
   6. CLs for test failures found by both approaches.
   """
 
   # Start date of querying suspected CLs.
-  # Note: the confidence scores will be for all the CLs up until end_date,
-  # not just for CLs from start date to end_date.
+  # Note: the start date will be 6 months before end date.
   start_date = ndb.DateTimeProperty(indexed=False)
 
   # End date of querying suspected CLs.
   end_date = ndb.DateTimeProperty(indexed=True)
 
   # Time when the instance is updated.
   updated_time  = ndb.DateTimeProperty(indexed=True)
 
   # Confidence scores for CLs for compile failures found by Heuristic approach.
   compile_heuristic = ndb.LocalStructuredProperty(
@@ skipping 11 matching lines @@
 
   # Confidence score for CLs for test failures found by Try Job approach.
   test_try_job = ndb.LocalStructuredProperty(ConfidenceInformation)
 
   # Confidence score for CLs for test failures found by both approaches.
   test_heuristic_try_job = ndb.LocalStructuredProperty(ConfidenceInformation)
 
   @classmethod
   def Get(cls, version=None):
     confidences = cls.GetVersion(version=version)
-    return confidences or cls() if version is None else confidences
+    return (confidences or VersionedModel.Create() if version is None
+            else confidences)
 
   def Update(
       self, start_date, end_date,
       compile_heuristic, compile_try_job, compile_heuristic_try_job,
       test_heuristic, test_try_job, test_heuristic_try_job):
 
     self.start_date = start_date
     self.end_date = end_date
     self.updated_time = GetUTCNow()
     self.compile_heuristic = compile_heuristic
     self.compile_try_job = compile_try_job
     self.compile_heuristic_try_job = compile_heuristic_try_job
     self.test_heuristic = test_heuristic
     self.test_try_job = test_try_job
     self.test_heuristic_try_job = test_heuristic_try_job
 
     if self.end_date <= end_date:
       self.put()
     else:
       self.Save()