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• what is useful of os.environ in google-app-engine , why google use os.environ so many times.

  - by zjm1126

  why google use so many os.environ .. thanks

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• how to make site show different language(chinese and english) on google-app-engine.

  - by zjm1126

  if you using django ,you can use the "LC_MESSAGES --django.po" but has any way to do this on gae ? and how to .. thanks and if i only want to use django's this features, how can i import it?

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• Google app engine How to count SUM from datestore?

  - by Alon

  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 ?

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• how to enable a method in tamplate of google-app-engine..

  - by zjm1126

  the mothed is : def printa(x): return x the reponse is : self.response.out.write(template.render(path, {'printa':printa})) the html is : {{ printa 'sss'}} i want to show 'sss' in my page , so how to do this , thanks

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• How do I forbid search engine to index subdirectory /CRM with robot.txt?

  - by user198729

  Or even forbid indexing the whole site?

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• google app engine: go to login page by javascript?

  - by user342284

  Do anyone know how do use javascript to redirect user login using Google Accounts? I know there is "users.create_login_url(self.request.path)" but how do that integrated to "`window.location" Or there is alternative??

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• Fetching a random record from the Google App Engine Datastore?

  - by demos

  I have a datastore with around 1,000,000 entities in a model. I want to fetch 10 random entities from this. I am not sure how to do this? can someone help?

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• How to get to the key name of a referenced entity property from an entity instance without a datastore read in google app engine?

  - by Sumeet Pareek

  Consider I have the following models - class Team(db.Model): # say I have just 5 teams name = db.StringProperty() class Player(db.Model): # say I have thousands of players name = db.StringProperty() team = db.ReferenceProperty(Team, collection_name="player_set") Key name for each Team entity = 'team_' , and for each Player entity = 'player_' By some prior arrangement I have a Team entity's (key_name, name) mapping available to me. For example (team_01, United States Of America), (team_02, Russia) etc I have to show all the players and their teams on a page. One way of doing this would be - players = Player.all().fetch(1000) # This is 1 DB read for player in players: # This will iterate 1000 times self.response.out.write(player.name) # This is obviously not a DB read self.response.out.write(player.team.name) #This is a total of 1x1000 = 1000 DB reads That is a 1001 DB reads for a silly thing. The interesting part is that when I do a db.to_dict() on players, it shows that for every player in that list there is 'name' of the player and there is the 'key_name' of the team available too. So how can I do the below ?? players = Player.all().fetch(1000) # This is 1 DB read for player in players: # This will iterate 1000 times self.response.out.write(player.name) # This is obviously not a DB read self.response.out.write(team_list[player.<SOME WAY OF GETTING TEAM KEY NAME>]) # Here 'team_list' already has (key_name, name) for all 5 teams I have been struggling with this for a long time. Have read every available documentation. I could just hug the person that can help me here :-) Disclaimer: The above problem description is not a real scenario. It is a simplified arrangement that represents my problem exactly. I have run into it in a rater complex and big GAE appication.

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• where is the data store when i using google-app-engine on localhost..

  - by zjm1126

  i want to find the data on my disk thanks

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• How fast are App Engine db.get(keys) and A.all(keys_only=True).filter('b =', b).fetch(1000)?

  - by Liron Shapira

  A db.get() of 50 keys seems to take me 5-6 seconds. Is that normal? What is the time a function of? I also did a A.all(keys_only=True).filter('b =', b).fetch(1000) where A.b is a ReferenceProperty. I did 50 such round trips to the datastore, with different values of b, and the total time was only 3-4 seconds. How is this possible? db.get() is done in parallel, with only one trip to the datastore, and I would think that looking up an entity by key is a faster operation than fetch.

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• How do I do a fresh install of Google App Engine?

  - by ryan

  I've been using GAE for months now, but very recently I've had difficulty getting the latest release (1.3.4) to work for me. I'd like to remove GAE and start from scratch and reinstall it. However, it appears that deleting the googleappenginelauncher.app is not enough to completely remove it, because when I install the launcher again I see that it remembers the applications it was running previously (so at a minimum, there are some config files out there that I'm not removing properly). I'm new to Macs, so if there are other things I need to do besides deleting the .app, please let me know. Thanks for your help!

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• how to set inbound mail for google-app-engine..

  - by zjm1126

  this is my set:

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• Can Google App Engine ever support SSL with custom domains (i.e. with Google Apps)?

  - by allyourcode

  I know that GAE does not support this yet, but is there any reason it can't be done? If they can add support, I'd assume they're working on that. Have they said anything about this publicly?

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• how to make the StringListProperty's value unique in google-app-engine.

  - by zjm1126

  can do this ????: class Thread(db.Model): members = db.StringListProperty(unique =True) thanks

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• Google App Engine - Is os.environ reset between requests?

  - by Ian Charnas

  Hello I can't think of a way to test this and was hoping someone here knew the answer... I'm storing some request-specific data in os.environ, and was wondering if that data was going to leak to other requests. Does anyone know? Yes I realize that it's normal to use request.environ for this, and usually I do, but I want to store the currently authorized user ID (I'm using custom auth, not GAE auth) inside os.environ so that the models know the currently logged in user (remember, they don't have access to request.environ) without me having to pass the request object to just about every single model method. any help would be greatly appreciated Ian

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• database modeling for google app engine for multiple revison of entity.

  - by iamgopal

  hi, in my application ( kind of wiki clone ) - an article is frequently changing. and i need to track all changes that are done on that article. { text only. } one crude way i have done it, is to add a datetime property and create a new entity everytime something change. which is too much database wasting. { and also un-necessary index waste too. } and also need to re-create parent-child and entity relationships. i also have log which can show changes -- but i want some thing easier , so that jumping from one version to another version could be easier. ideas ? thanks.

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• how to identify Google App Engine app from browser string ?

  - by zzzeek

  Some app is hitting my site excessively from GAE. Here is the browser string in the logs: AppEngine-Google; (+http://code.google.com/appengine; appid: ware) Can that app be identified ? "appid" would seem to indicate this but it doesn't seem to be the case.

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• Is it possible to add headers to emails being sent by app-engine?

  - by Peter Farmer

  I'm currently putting the finishing touches to an application for a client, this application sends daily emails to subscribers, is it possible to add custom headers to the email so that certain variables can be tracked, like day number (X-Day-Number) etc...

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• [app-engine-java-groovy] One-to-Many relationship. Select objects from datastore.

  - by Olexandr

  Hi. I've omitted some code(package declarations, imports, other fields) for shortness. I have here simple One-to-Many relation. It worked fine till this moment. @PersistenceCapable(identityType = IdentityType.APPLICATION, detachable="true") class Restaurant implements Serializable { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) Key id @Persistent(mappedBy = "restaurant") List<RestaurantAddress> addresses = new ArrayList<RestaurantAddress>() } //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= @PersistenceCapable(identityType = IdentityType.APPLICATION, detachable="true") class RestaurantAddress implements Serializable { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) Key id @Persistent Restaurant restaurant } Now i need to get(select) all the Restaurants from DB: def getRestaurantsToExport(final String dst, final int count) { String field = restaurantExportFields[dst] return transactionExecute() { PersistenceManager pm -> Query q = pm.newQuery(Restaurant.class) q.filter = "$field == null" q.setRange(0, count) return q.execute() } } But there are on problem - query gives me 12 restaurants(as in DB) but every Restaurant has 0 Address but in Datastore every Restaurant has minimum 2 addresses. Have anyone the same problem or knows the solution ?

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• What datatypes are supported by Google App Engine's datastore?

  - by user309944

  I know how to table in google BigTable.I have one doubt regarding this.what are all the datatype supported by google BigTable. Thanks in advance

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• Google App Engine: How do I save uploaded text file to Blob, then read from it line by line?

  - by Jack Low

  I have a huge file (over 16,000 lines) that I want to save in the datastore for parsing later. Each line contains info on an entity. How do I read line by line from the stored Blob? I can't seem to find a good tutorial or documentation on a Blob anywhere. GAE only shows how to deal with images, but I want to read from the stored text file.

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• (Google App Engine) How can I keep my password long time for updating content?

  - by SPnova

  Now when I run this command: /usr/bin/python ~/google_appengine/appcfg.py update ~/cdn I should write email and password. And it is keeping some time, but after a day, I should write email and password again. How can I keep my auntification (email and password) for long time (month, year)?

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• how to make this gaema demo running on google-app-engine..

  - by zjm1126

  this is the package which has a webapp demo in it : http://code.google.com/p/gaema/source/checkout but when i login use this demo , i get a error : so how to make this demo running on the gae-launcher thanks

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• How to reduce duplicate web pages when rolling my own search engine?

  - by user198729

  One articles can be posted on many sites the same article on a specific website can be visited by several different urls. How do I reduce duplicated stuff in the above occasions?

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• Using low level api for datastore in google app engine ? is it bad ?

  - by Chez

  There is little documentation on how to use the low level api for datastore and quite a lot on JPA and JDO and how it translates to it. My question is: is there any advantage in coding against the JPA or JDO specs instead of accessing directly the low level api for datastore ? From an initial look, it seems simple and straight forward but I am not sure if there are good reasons why not to do it. Thanks Cx

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