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• App Engine SDK Console Not Fully Updated on OSX for GAE Release 1.3.4

  - by ryan

  I downloaded and am running the latest SDK (in About GoogleAppleEngineLauncher, I see it is version 1.3.4.794), but when I open the SDK Console and go to the Task Queue section, I still see "Tasks will not run automatically. Select a queue to run tasks manually." I have not added the flag --disable_task_running, so I'm confused as to why it is still manual for me.

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• App Engine - Query using a class member as parameter

  - by Zach

  I have a simple class, relevant details below: @PersistenceCapable(identityType = IdentityType.APPLICATION) public class SimpleCategory implements Serializable{ ... public static enum type{ Course, Category, Cuisine } @Persistent public type t; ... } I am attempting to query all SimpleCategory objects of the same type. public SimpleCategory[] getCategories(SimpleCategory.type type) { PersistenceManager pm = PMF.get().getPersistenceManager(); try{ Query q = pm.newQuery(SimpleCategory.class); q.setFilter("t == categoryType"); q.declareParameters("SimpleCategory.type categoryType"); List<SimpleCategory> cats = (List<SimpleCategory>) q.execute(type); ... } This results in a ClassNotResolvedException for SimpleCategory.type. The google hits I've found so far recommended to: Use query.declareImports to specify the class i.e. q.declareImports("com.test.zach.SimpleCategory.type"); Specify the fully qualified name of SimpleCategory in declareParameters Neither of these suggestions has worked. By removing .type and recompiling, I can verify that declareParameters can see SimpleCategory just fine, it simply cannot see the SimpleCategory.type, despite the fact that the remainder of the method has full visibility to it. What am I missing?

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• In google app engine, how to iterate through form fields (python, wsgiref.handlers)

  - by MarcoB

  Using python and wsgiref.handlers, I can get a single variable from a form with self.handler.request.get(var_name), but how do I iterate through all form variables, be they from GET and POST? Is it something like this? for field in self.handler.request.fields: value = self.handler.request.get(field) Again, it should include both fields included in the POST and fields from the query string, as in a GET request. Thanks in advance folks...

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• Is there a python module compatible with Google Apps Engine's new "Tasks"

  - by refack

  I'm writing a Python application, that I want to later migrate to GAE. The new "Task Queues" API fulfills a requirement of my app, and I want to simulate it locally until I have the time to migrate the whole thing to GAE. Does anyone know of a compatible module I can run locally?

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• Change|Assign parent for the Model instance on Google App Engine Datastore

  - by Vladimir Prudnikov

  Is it possible to change or assign new parent to the Model instance that already in datastore? For example I need something like this task = db.get(db.Key(task_key)) project = db.get(db.Key(project_key)) task.parent = project task.put() but it doesn't works this way because task.parent is built-in method. I was thinking about creating a new Key instance for the task but there is no way to change key as well. Any thoughts?

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• Google App Engine: Update model definitons?

  - by Rosarch

  I recently updated one of my models by adding a db.ListProperty(): class DependencyArcTail(db.Model): courses = db.ListProperty(db.Key) ''' newly added ''' forwardLinks = db.ListProperty(db.Key) However, I can't seem to get this to be reflected in the SDK dashboard. I cleared the datastore and reloaded it. Then I ran the procedures that create the DependencyArcTail objects. However, forwardLinks still doesn't show up as an attribute in the SDK dashboard. What's happening?

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• Pagination in Google App Engine with Java

  - by newbie

  I need to create simple pagination of objects, but when I read manual I found out that query.setRange(5, 10); will fetch 10 objects, even when only 5 objects are needed. Is there anyway to fetch just needed objects? EDIT: I started bounty, so fi you can show me simple example code in Java that works, then I will accept you answer.

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• Good javascript template engine to work with json...

  - by Pandiya Chendur

  I have looked at jTemplates and it's worth a try. Are there any other template engines other than jTemplates?

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• StringListProperty limited to 500 char strings (Google App Engine / Python)

  - by MarcoB

  It seems that StringListProperty can only contain strings up to 500 chars each, just like StringProperty... Is there a way to store longer strings than that? I don't need them to be indexed or anything. What I would need would be something like a "TextListProperty", where each string in the list can be any length and not limited to 500 chars. Can I create a property like that? Or can you experts suggest a different approach? Perhaps I should use a plain list and pickle/unpickle it in a Blob field, or something like that? I'm a bit new to Python and GAE and I would greatly appreciate some pointers instead of spending days on trial and error...thanks!

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• Google App Engine - Dealing with concurrency issues in storing an object

  - by Spines

  My User object that I want to create and store in the datastore has an email, and a username. How do I make sure when creating my User object that another User object doesn't also have either the same email or the same username? If I just do a query to see if any other users have already used the username or the email, then there could be a race condition.

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• Emailing a picture to a Google App Engine site

  - by Dan Hook

  I would like to create an app such that I can send an email with a JPEG attachment and then display it on my site. I am fairly certain that the Mail API allows me to do this, but if it isn't possible please let me know. My biggest concern is what are the limits on the attachment size my app can receive, and what are the quotas related to receiving email? The email quotas I saw seemed to specify quotas for outgoing email. Is it different for incoming mail?

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• OnetoMany and ManytoMany using Grails and JPA on google app engine

  - by adddd

  I googled a lot but i find crap documentation about jpa. I had to implement a domain model like cat and dog inherit from animal, and animal has a one to many and a many to many relation. How to do that?

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• Google App Engine Python Datastore

  - by python appengine

  Basically what Im trying to make is a data structure where it has the users name, id, and datejoined. Then i want a "sub-structure" where it has the users "text" and the date it was modified. and the user will have multiple instances of this text. class User(db.Model): ID = db.IntegerProperty() name = db.StringProperty() datejoined = db.DateTimeProperty(auto_now_add=True) class Content(db.Model): text = db.StringProperty() datemod= db.DateTimeProperty(auto_now_add = True) Is the code set up correctly?

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• google app engine db.Model in python only display user-defined fields

  - by MattM

  I'm a python newbie so I apologize in advance if this question has been asked before. I am building out an application in GAE and need to generate a report that contains the values for a user-defined subset of fields. For example, in my db model, CrashReport, I have the following fields: entry_type entry_date instance_id build_id crash_text machine_info I present a user with the above list as a checkbox group from which they select. Whichever fields the user selects, I then create a report showing all the values in the datastore, but only for the fields that they selected. For example, if from the above list, the user selects the build_id and crash_text fields, the output might look like this: build_id crash_text 0.8.2 blown gasket 0.8.2 boom! 0.8.1 crack! ... So the question is, how exactly do I only access the values for the fields which the user has defined?

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• importing app engine sample in eclipse

  - by tsey76

  Downloaded GAE sample code and copied into Eclipse pydev explorer and got following errors on execution Traceback (most recent call last): File "C:\Program Files\Google\google_appengine\dev_appserver.py", line 67, in <module> run_file(__file__, globals()) File "C:\Program Files\Google\google_appengine\dev_appserver.py", line 63, in run_file execfile(script_path, globals_) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 417, in <module> sys.exit(main(sys.argv)) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 360, in main config, matcher = dev_appserver.LoadAppConfig(root_path, {}) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3441, in LoadAppConfig raise AppConfigNotFoundError google.appengine.tools.dev_appserver.AppConfigNotFoundError

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• Exception Handaling in google app engine

  - by Rahul99

  i am raising exception using if UserId == '' and Password == '': raise Exception.MyException , "wrong userId or password" but i want print the error message on same page class MyException(Exception): def __init__(self,msg): Exception.__init__(self,msg)

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• Many-to-Many Relationship (with properties) in Google App Engine for Java

  - by rvandervort

  I understand from the official documentation on unowned relationships that the app must use sets of Key objects on either side of the relationship. This makes perfect sense. Coming from many years of RDBM-style programming, though, I'm pretty confused about how I can model properties of that relationship itself. For example, if I have entities Category and Entry in my many-to-many relationship and would like to persist a dateAdded property, or some other data that are only relevant when both sides of the relationship are known. I suppose it would be possible to create a third class : CategoryEntry that links the two, but this seems like a kludge. What is the proposed way to model this kind of situation ?

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• Google App Engine: Which is its RDBMS?

  - by Vimvq1987

  According to this: http://code.google.com/appengine/docs/whatisgoogleappengine.html it seems that GAE only uses Datastore to store data, which is equivalent with Table service on Windows Azure Platform. Does anyone know that which RDBMS it uses? or such thing exists or not?

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• What's a good HTML template engine for C++?

  - by apphacker

  Planning to write a website in C++. Would like to use a template system like Clearsilver, but maybe there's a better alternative?

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• Google App Engine + AWS S3 file protection!

  - by grep

  Hi all, I have an application running on GAE/J that streams video from AWS S3. I need a solution for protecting the video from being stolen and I found that pre-signed URLs might be it (??). How can I create pre-signed URLs from GAE/J or there's a better solution to secure the videos? thanks

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• Google App Engine: Difficulty with Users API (or maybe just a Python syntax problem)

  - by Rosarch

  I have a simple GAE app that includes a login/logout link. This app is running on the dev server at the moment. The base page handler gets the current user, and creates a login/logout url appropriately. It then puts this information into a _template_data dictionary, for convenience of subclasses. class BasePage(webapp.RequestHandler): _user = users.get_current_user() _login_logout_link = None if _user: _login_logout_link = users.create_logout_url('/') else: _login_logout_link = users.create_login_url('/') _template_data = {} _template_data['login_logout_link'] = _login_logout_link _template_data['user'] = _user def render(self, templateName, templateData): path = os.path.join(os.path.dirname(__file__), 'Static/Templates/%s.html' % templateName) self.response.out.write(template.render(path, templateData)) Here is one such subclass: class MainPage(BasePage): def get(self): self.render('start', self._template_data) The login/logout link is displayed fine, and going to the correct devserver login/logout page. However, it seems to have no effect - the server still seems to think the user is logged out. What am I doing wrong here?

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• any other data format except 'csv' can upload to gae(google-app-engine)

  - by zjm1126

  i can use 'csv' file to upload to gae , and i want to know , can any other data format do this, thanks

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• Google App Engine - Delete until count() <= 0

  - by user365918

  What is the difference between these 2 pieces of code? query=Location.all(keys_only=True) while query.count()>0: db.delete(query.fetch(5)) # -- while True: query=Location.all(keys_only=True) if not query.count(): break db.delete(query.fetch(5)) They both work.

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• Google app engine-php: script handler

  - by Eve

  I try to create php web app using GAE. In the GAE tutorial, "A script handler executes a PHP script to handle the request that matches the URL pattern. The mapping defines a URL pattern to match, and the script to be executed" Now I want to map the url with the file having same name in the folder, e.g. if the url is /hello.* , it will map the file name hello.php in the folder. And if it is /hello1.*, hello1.php in the folder will be responded to the server. I thought this should be done directly by mapping the name of the url with the name in the folder. But if I left empty for the handler in the app.yaml, I got an error. So I want to know how to set up the handler in app.yaml?

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• How to enforce unique field value in java Google App Engine

  - by supercobra

  Hello there, I am try to find out how to enforce uniqueness in fields other than the unique id. Example: @PersistenceCapable(identityType = IdentityType.APPLICATION) public class User implements IsSerializable { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; @Persistent private String name; @Persistent private String email; // <= I want this to be unique as well } In the example above, how can I enforce uniqueness of the email value across the database? Daniel

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