google-app-engine

问题 I have two models, Book and Chapter, in a one-to-many relationship. I manually create the keys for both Book and Chapter. To persist, I create a book object then add an instance of chapter to it and then persist book. This works fine, as I see them in the datastore. Now when I try to fetch a chapter from the datastore by key, I get a null object. Here is how the keys look in the datastore: Under Book: name/id = 123 chapters = [Book(123)/Chapter("abc")] Under Chapter: name/id = abc I created

问题 What is a good way to check to see if a property is populated in an expando class (Python for App Engine) Can I do: if Expando_class_name.property_name_to_check: do = someStuff Or is that going to give me an error? Thanks! 回答1: Use hasattr : if hasattr(expando_instance, 'foo'): # Do something with expando_instance.foo 回答2: A better way is to use the dynamic_properties method. if 'foo' in entity.dynamic_properties(): pass 来源： https://stackoverflow.com/questions/6339032/app-engine-check-to-see

问题 During a recent update of an app on Google App Engine I was in the process of updating the database with: SETTINGS_MODE='prod' ./manage.py syncdb This worked last time I ran it, but now I am getting the following error: Traceback (most recent call last): File "./manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line utility.execute() File "/Library/Python/2.7/site

问题 During a recent update of an app on Google App Engine I was in the process of updating the database with: SETTINGS_MODE='prod' ./manage.py syncdb This worked last time I ran it, but now I am getting the following error: Traceback (most recent call last): File "./manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line utility.execute() File "/Library/Python/2.7/site

问题 During a recent update of an app on Google App Engine I was in the process of updating the database with: SETTINGS_MODE='prod' ./manage.py syncdb This worked last time I ran it, but now I am getting the following error: Traceback (most recent call last): File "./manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line utility.execute() File "/Library/Python/2.7/site

问题 The forms.errors dict seems to be sorted on field name, and not on the order they are declared in the form itself. E.g. class ProductForm(Form): code = TextField('Code', validators=[Required()]) description = TextField('Description', validators=[Required(), Length(max=100)]) amount = DecimalField('Amount', validators=[Required(), NumberRange(min=0.00, max=1000000.00)]) vat_percentage = DecimalField('VAT %', validators=[Required(), NumberRange(min=0.00, max=100.00)]) inactive_date = DateField(

问题 I tried to upload my test gwt app but I've just faced a quite strange error. Every time I try to upload app I get this: Unable to update app: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=gwttestapp001&version=1.0& 500 Internal Server Error Server Error (500) A server error has occurred. See the deployment console for more details Unable to update app: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=gwttestapp001&version=1.0&

问题 I tried to upload my test gwt app but I've just faced a quite strange error. Every time I try to upload app I get this: Unable to update app: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=gwttestapp001&version=1.0& 500 Internal Server Error Server Error (500) A server error has occurred. See the deployment console for more details Unable to update app: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=gwttestapp001&version=1.0&

问题 I've always hated the headache of managine dates, times, datetimes, and the various formats and conversions that are needed with them. I'm taking an online course on using the google app engine and it says to use the datetime property, which is returning a date in the format: 2012-06-25 01:17:40.273000 I tried datetime.strptime('2012-06-25 01:17:40.273000','%y-%m-%d %H:%M:%S') but it didn't work.. I just want to extract the 2012-06-25 part without using a hacky regex or string slicing

问题 I'm developing a web application using Google app engine for Java. I will use Google Cloud storage and according to the documentation, I'm using GCS client library to emulate cloud storage on local disk. I have no problem saving the files, I can see them from eclipse under the war folder (under the path WEB-INF/appengine-generated) and I can see them from the web admin panel accessible from the url localhost:8888/_ah/admin as indicated in this question My question is the following. Which are