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    <p>Ok - my python not great so any help would be appreciated - You dont need to write a parser - this is the solution:</p> <p>add this utlity class <a href="http://code.google.com/p/google-app-engine-samples/source/browse/trunk/geochat/json.py?r=55" rel="noreferrer">http://code.google.com/p/google-app-engine-samples/source/browse/trunk/geochat/json.py?r=55</a> </p> <pre><code> import datetime import time from google.appengine.api import users from google.appengine.ext import db #this is a mod on the orinal file for some reason it includes its own simplejson files i have ref django! from django.utils import simplejson class GqlEncoder(simplejson.JSONEncoder): """Extends JSONEncoder to add support for GQL results and properties. Adds support to simplejson JSONEncoders for GQL results and properties by overriding JSONEncoder's default method. """ # TODO Improve coverage for all of App Engine's Property types. def default(self, obj): """Tests the input object, obj, to encode as JSON.""" if hasattr(obj, '__json__'): return getattr(obj, '__json__')() if isinstance(obj, db.GqlQuery): return list(obj) elif isinstance(obj, db.Model): properties = obj.properties().items() output = {} for field, value in properties: output[field] = getattr(obj, field) return output elif isinstance(obj, datetime.datetime): output = {} fields = ['day', 'hour', 'microsecond', 'minute', 'month', 'second', 'year'] methods = ['ctime', 'isocalendar', 'isoformat', 'isoweekday', 'timetuple'] for field in fields: output[field] = getattr(obj, field) for method in methods: output[method] = getattr(obj, method)() output['epoch'] = time.mktime(obj.timetuple()) return output elif isinstance(obj, time.struct_time): return list(obj) elif isinstance(obj, users.User): output = {} methods = ['nickname', 'email', 'auth_domain'] for method in methods: output[method] = getattr(obj, method)() return output return simplejson.JSONEncoder.default(self, obj) def encode(input): """Encode an input GQL object as JSON Args: input: A GQL object or DB property. Returns: A JSON string based on the input object. Raises: TypeError: Typically occurs when an input object contains an unsupported type. """ return GqlEncoder().encode(input) </code></pre> <p><strong>save as json.py</strong></p> <p>TO USE</p> <pre><code>import cgi import os import json from google.appengine.ext.webapp import template from google.appengine.api import users from google.appengine.ext import webapp from google.appengine.ext.webapp.util import run_wsgi_app from google.appengine.ext import db class Greeting(db.Model): author = db.UserProperty() content = db.StringProperty(multiline=True) date = db.DateTimeProperty(auto_now_add=True) class MainPage(webapp.RequestHandler): def get(self): greetings_query = Greeting.all().order('-date') greetings = greetings_query.fetch(5) if users.get_current_user(): url = users.create_logout_url(self.request.uri) url_linktext = 'Logout' else: url = users.create_login_url(self.request.uri) url_linktext = 'Login' template_values = { 'greetings': greetings, 'url': url, 'url_linktext': url_linktext, } path = os.path.join(os.path.dirname(__file__), 'index.html') self.response.out.write(template.render(path, template_values)) class Guestbook(webapp.RequestHandler): def post(self): greeting = Greeting() if users.get_current_user(): greeting.author = users.get_current_user() greeting.content = self.request.get('content') greeting.put() self.redirect('/') #here i return my json feed - simple implementaion for example class FeedHandler(webapp.RequestHandler): def get(self): """Retrieve a feed""" user = None greetings_query = Greeting.all().order('-date') rs= greetings_query.fetch(5) #this is the part that calls the encoder - dosnt cause an exception data = json.encode(rs) #roll out to browser -might need to check my headers etc self.response.headers['Content-Type'] = 'application/json; charset=utf-8' self.response.out.write(data) application = webapp.WSGIApplication( [ ('/', MainPage), ('/sign',Guestbook), ('/feed',FeedHandler), ], debug=True ) def main(): run_wsgi_app(application) if __name__ == "__main__": main() </code></pre> <p>This is the browser response:</p> <blockquote> <p>[{"content": "", "date": {"ctime": "Sat Jan 23 02:40:22 2010", "hour": 2, "isoweekday": 6, "month": 1, "second": 22, "microsecond": 434000, "isocalendar": [2010, 3, 6], "timetuple": [2010, 1, 23, 2, 40, 22, 5, 23, -1], "year": 2010, "epoch": 1264214422.0, "isoformat": "2010-01-23T02:40:22.434000", "day": 23, "minute": 40}, "author": {"nickname": "test@example.com", "email": "test@example.com", "auth_domain": "gmail.com"}}, {"content": "", "date": {"ctime": "Sat Jan 23 01:12:43 2010", "hour": 1, "isoweekday": 6, "month": 1, "second": 43, "microsecond": 972000, "isocalendar": [2010, 3, 6], "timetuple": [2010, 1, 23, 1, 12, 43, 5, 23, -1], "year": 2010, "epoch": 1264209163.0, "isoformat": "2010-01-23T01:12:43.972000", "day": 23, "minute": 12}, "author": {"nickname": "test@example.com", "email": "test@example.com", "auth_domain": "gmail.com"}}, {"content": "test", "date": {"ctime": "Fri Jan 22 22:32:13 2010", "hour": 22, "isoweekday": 5, "month": 1, "second": 13, "microsecond": 659000, "isocalendar": [2010, 3, 5], "timetuple": [2010, 1, 22, 22, 32, 13, 4, 22, -1], "year": 2010, "epoch": 1264199533.0, "isoformat": "2010-01-22T22:32:13.659000", "day": 22, "minute": 32}, "author": {"nickname": "test@example.com", "email": "test@example.com", "auth_domain": "gmail.com"}}, {"content": "", "date": {"ctime": "Fri Jan 22 22:29:49 2010", "hour": 22, "isoweekday": 5, "month": 1, "second": 49, "microsecond": 358000, "isocalendar": [2010, 3, 5], "timetuple": [2010, 1, 22, 22, 29, 49, 4, 22, -1], "year": 2010, "epoch": 1264199389.0, "isoformat": "2010-01-22T22:29:49.358000", "day": 22, "minute": 29}, "author": {"nickname": "test@example.com", "email": "test@example.com", "auth_domain": "gmail.com"}}, {"content": "ah it works!\r\n", "date": {"ctime": "Fri Jan 22 22:29:22 2010", "hour": 22, "isoweekday": 5, "month": 1, "second": 22, "microsecond": 995000, "isocalendar": [2010, 3, 5], "timetuple": [2010, 1, 22, 22, 29, 22, 4, 22, -1], "year": 2010, "epoch": 1264199362.0, "isoformat": "2010-01-22T22:29:22.995000", "day": 22, "minute": 29}, "author": {"nickname": "test@example.com", "email": "test@example.com", "auth_domain": "gmail.com"}}]</p> </blockquote>
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    2. COWas not immediately apparent to me (python and GAE newbie) but you need to include the simplejson module code into your GAE files/packages.
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    3. COHow to use this for db model having Reference property? (I have one db class which hv another db model reference and this soln is not working)
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