google-app-engine

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Update query in google app engine data store (java)

How to use the update query in google app engine while using with gwt. I'm trying to make a chat application where apart from submitting and deleting the previous messages, the administrator can edit out the portions of existing messages. For editing the existing messages update query is needed and I could not find anything like update ...

how to write or create (when no exist) a file using python and Google AppEngine

this is my code: f = open('text/a.log', 'wb') f.write('hahaha') f.close() and it is not create a new file when not exist how to do this , thanks updated class MyThread(threading.Thread): def run(self): f = open('a.log', 'w') f.write('hahaha') f.close() error is : Traceback (most recent call last): ...

How ugly is my code implementing polymorphic models?

I am using Polymorphic Models. Simple Question: My code below works without using this line below, which I see in other people's code. What is it supposed to do? #super(GeneralModel, self).__init__(*args, **kwargs) Messy Question: I have a feeling my code below, although it seems to work, is not the most beautiful solution. Synopsi...

Unable to Display image in Google App Engine (Python)

Hi, I am unable to display images in pages created using Google App Engine(Python). My app.yaml file has : - url: /images static_dir: images And the python file has: self.response.out.write("""<img src = '/images/title.gif' />""") The image still does not display in the page. Thanks ...

how to send some data to the Thread module on python and google-map-engine

from google.appengine.ext import db class Log(db.Model): content = db.StringProperty(multiline=True) class MyThread(threading.Thread): def run(self,request): #logs_query = Log.all().order('-date') #logs = logs_query.fetch(3) log=Log() log.content=request.POST.get('content',None) log.put() ...

Instantiate a model when the kind of model needed is represented as a string argument

My input data is a string representing the kind of datastore model I want to make. In python, I am using the eval() function to instantiate the model (below code), but this seems overly complex so I was wondering if there is a simpler way people normally do this? >>>model_kind="TextPixels" >>>key_name_eval="key_name" >>>key_name="key_n...

Feedback on availability with Google App Engine

We've had some good experiences building an app on Google App Engine, this first app's target audience are Google Apps users, so no issues there in terms of it being hosted on Google infrastructure. We like it so much that we would like to investigate using it for another app, however this next project is for a client who is not really ...

Multiple Django Instances on one AppEngine Server

For our project we host both the website and the actual webapp on one AppEngine instance. I separated them both nicely in different projects, but they all share the same settings file. It's becoming more and more clear to me that these should actually be independent django instances as they use different settings for middleware, template...

How to retrieve Google App Engine entities by ancestor

I have the following 2 models in my Google App Engine datastore: class Search(db.Model): what = db.StringProperty() class SearchResult(db.Model): search = db.ReferenceProperty(Search) title = db.StringProperty() content = db.StringProperty() And, I am trying to retrieve all SearchResult entities for a given Search en...

What is dbReferenceProperty?

Hi, In the python app engine docs, I see something called dbReferenceProperty. I can't understand what it is, or how it's used. I'm using the java interface to app engine, so I'm not sure if there's an equivalent. I'm interested in it because it sounds like some sort of pseudo-join, where we can point a property of a class to some oth...

Doing a global count of an object type (like Users), best practice?

Hi, I know keeping global counters is frowned upon in app engine. I am interested in getting some stats though, like once every 24 hours. For example, I'd like to count the number of User objects in the system once every 24 hours. So how do we do this? Do we simply keep a set of admin tool functions which do something like: SELECT FRO...

GWT on iPhone 4.0 with 3G network

I have just encountered very strange problem - my GWT app hosted on Google App Engine does not want to work on iPhone over 3G, however it works fine over Wi-Fi. For testing I created empty GWT module with only Window.alert in the onModuleLoad. If I switch on Wi-Fi, the alert is shown, with 3G - just blank page although with correct titl...

Is SMS the only way to register with Google App Engine?

I don't have a cell phone, but Google App Engine needs an SMS message to verify the account. Is there another way to complete the registration? I'm surprised they don't use a Gmail account to do this. Edit : Google created one for me, problem solved. ...

Setting up App Engine to receive email addresses with ids in the address

I am writing an App Engine app that is supposed to receive emails in this form: [email protected] (someID is an alphanumeric ID that I generate). I have this in my web.xml thinking it would catch emails that start with 'addcontact.': <servlet> <servlet-name>addNewContactServlet</servlet-name> <servl...

Google app engine How to count SUM from datestore?

Hey, Im wondering, how can i get a SUM of a rating entity i get from the datastore (python)? should i: ratingsum = 0 for rating in ratings: ratingsum + rating print ratingsum ? ...

Using key().id() on GAE Datastore and reverse geocoding

I have 6000 data of district, subdistrict. I need to represent this on dependent dropdown. The datamodel is for example; class Location(db.Model): location_name = db.StringProperty() //location_parent = db.IntegerProperty() location_parent = db.ReferenceProperty() // location_parent is reference to key() or id()? Still can...

Google App Engine says "Must authenticate first." while trying to deploy any app

Google App Engine says "Must authenticate first." while trying to deploy any app: me@myhost /opt/google_appengine $ python appcfg.py update ~/sda2/workspace/lyapapam/ Application: lyapapam; version: 1. Server: appengine.google.com. Scanning files on local disk. Scanned 500 files. Scanned 1000 files. Initiating update. Email: <email_her...

Sending multi-part email from Google App Engine using Spring's JavaMailSender fails

It works fine without the multi-part (modified from the example in Spring documentation): final MimeMessagePreparator preparator = new MimeMessagePreparator() { public void prepare(final MimeMessage mimeMessage) throws Exception { final MimeMessageHelper message = new MimeMessageHelper( mimeMessage); ...

How to retrieve content (keys) of a Java JCache object in a Google AppEngine application

Using Memcache Java API (http://code.google.com/appengine/docs/java/memcache/overview.html) The JCache is not fully implemented and the methods values(), keySet() as well as entrySet() throw java.lang.UnsupportedOperationException Anybody know of a workaround or have a working example using a lower-level API? ...