[Findit] Refactoring WfTryJobData into BaseTryJobData, WfTryJobData, and FlakeTryJobData

appengine/findit/model/wf_try_job.py

 # Copyright 2015 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 model.base_build_model import BaseBuildModel
 from model.base_try_job import BaseTryJob
 
 
@@ skipping 44 matching lines @@
         key=WfTryJob._CreateKey(master_name, builder_name, build_number))
     try_job.compile_results = try_job.compile_results or []
     try_job.test_results = try_job.test_results or []
     try_job.try_job_ids = try_job.try_job_ids or []
     return try_job
 
   @staticmethod
   def Get(master_name, builder_name, build_number):
     return WfTryJob._CreateKey(
         master_name, builder_name, build_number).get()
+
+  @classmethod
+  def GetBuildNumber(cls, key):
+    return int(key.pairs()[0][1].split('/')[2])
+
+  @ndb.ComputedProperty
+  def build_number(self):
+    return self.GetBuildNumber(self.key)