Use a hash of the name as workspace key.

Save Workspace and Notes in a transaction.

Both of these prevent there being Workspaces
with duplicate names.

getdates_handler.py

@@ -13,7 +13,7 @@ def get(self, **kwargs):
       offset = self.request.get('offset', '0')
       if not name:
           return
-      workspace = models.Workspace.query(models.Workspace.name==name).get()
+      workspace = models.Workspace.get_by_wsName(name)
       if not workspace:
           return
 

getrecent_handler.py

@@ -12,7 +12,7 @@ def get(self, **kwargs):
       name = self.request.get('name', '')
       if not name:
           return
-      workspace = models.Workspace.query(models.Workspace.name==name).get()
+      workspace = models.Workspace.get_by_wsName(name)
       if not workspace:
           return
       self.response.write(workspace.localtime_str())

main.py

@@ -63,8 +63,7 @@ def get(self, **kwargs):
         notes = []
         logging.info(name)
 
-        workspace = models.Workspace.query(models.Workspace.name==name).order(
-            -models.Workspace.time).get()
+        workspace = models.Workspace.get_by_wsName(name)
         if workspace:
             nextNoteNum = workspace.nextNoteNum
             lasttime = workspace.localtime_str()

models.py

@@ -1,15 +1,28 @@
 import datetime
+import hashlib
 
 import pytz
 from google.appengine.ext import ndb
 
 TIMEZONE = pytz.timezone('US/Eastern')
 
 class Workspace(ndb.Model):
-    name = ndb.StringProperty(required=True)
+    name = ndb.StringProperty()
     nextNoteNum = ndb.IntegerProperty(required=True)
     time = ndb.DateTimeProperty(required=True)
 
+    @staticmethod
+    def get_by_wsName(wsName):
+        key_id = hashlib.sha1(wsName).hexdigest()
+        return Workspace.get_by_id(key_id)
+
+    @staticmethod
+    def create(wsName, nextNoteNum, time):
+        key_id = hashlib.sha1(wsName).hexdigest()
+
+        return Workspace(id=key_id, name=wsName, nextNoteNum=nextNoteNum,
+                         time=time)
+
     def localtime_str(self):
         local_datetime = pytz.utc.localize(self.time).astimezone(TIMEZONE)
         return local_datetime.strftime('%Y-%m-%d %H:%M:%S')

save_handler.py

@@ -30,16 +30,12 @@ def post(self):
             note['text'] = node.firstChild.nodeValue.strip()
             notesJsonArray.append(note)
 
-        #@ndb.transactional
         def txn():
             nowtime = datetime.datetime.now().replace(microsecond=0)
-            workspace = models.Workspace.query(
-                models.Workspace.name==wsName).get()
+            workspace = models.Workspace.get_by_wsName(wsName)
             if not workspace:
-                workspace = models.Workspace(
-                    name=wsName,
-                    nextNoteNum=nextNoteNum,
-                    time=nowtime)
+                workspace = models.Workspace.create(
+                    wsName, nextNoteNum, nowtime)
                 workspace.put()
 
             workspace.time = nowtime
@@ -50,7 +46,7 @@ def txn():
                 time=nowtime,
                 notesJsonArray=notesJsonArray)
             notes.put()
-        #ndb.transaction(txn, xg=True)
+        ndb.transaction(txn, xg=True)
         txn()
 
         origin = self.request.headers.get('Origin', '')