How to put data from a form in a datastore, using python - google app engine
I am a beginner in Google app engine and i have this question.
I try to create a form and when you submit to put all data in datastore. for exmble
class Book(db.Model):
#book_id = db.key
title = db.StringProperty()
author = db.StringProperty()
#copies = db.IntegerProperty()
category = db.StringProperty()
class GuestBook(webapp.RequestHandler): def get(self):
self.response.out.write("""
<html>
<body>
<form action="/sign" method="post">
<div>Title: <input type="text" name="title"</div>
<div>Author: <input type="text" name="author"</div>
<div>Copies: <input type="text" name="copies"</div>
<div><select>
<option name="category" value="adventure">Adventure</option>
<option name="category" value="comedy">Comedy</option>
<option name="category" value="dramatic">Dramatic</option>
<option name="category" value="mystery">Mystery</option>
<option name="category" value="science_fiction">Science Fiction</option></select>
<div><input type="submit" value="Add Book"></div>
</form>
</body>
</html>""")
and I tried this
class Add(webapp.RequestHandler):
def post(self):
Book.title = self.request.get('title')
Book.author = self.request.get('author')
Book.category = self.request.get('category')
book = Book()
book.put()
But i got these
Traceback (most recent call last):
File "/home/kostas89/google_appengine/google/appengine/ext/webapp/__init__.py", line 636, in __call__
handler.post(*groups)
File "/home/kostas89/library/library.py", line 59, in post
book.put()
File "/home/kostas89/google_appengine/google/appengine/ext/db/__init__.py", line 984, in put
return datastore.Put(self._entity, config=config)
File "/home/kostas89/goo开发者_运维百科gle_appengine/google/appengine/api/datastore.py", line 455, in Put
return _GetConnection().async_put(config, entities, extra_hook).get_result()
File "/home/kostas89/google_appengine/google/appengine/datastore/datastore_rpc.py", line 629, in get_result
self.check_success()
File "/home/kostas89/google_appengine/google/appengine/datastore/datastore_rpc.py", line 599, in check_success
rpc.check_success()
File "/home/kostas89/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 558, in check_success
self.__rpc.CheckSuccess()
File "/home/kostas89/google_appengine/google/appengine/api/apiproxy_rpc.py", line 156, in _WaitImpl
self.request, self.response)
File "/home/kostas89/google_appengine/google/appengine/api/datastore_file_stub.py", line 710, in MakeSyncCall
response)
File "/home/kostas89/google_appengine/google/appengine/api/apiproxy_stub.py", line 87, in MakeSyncCall
method(request, response)
File "/home/kostas89/google_appengine/google/appengine/api/datastore_file_stub.py", line 793, in _Dynamic_Put
self.__WriteDatastore()
File "/home/kostas89/google_appengine/google/appengine/api/datastore_file_stub.py", line 643, in __WriteDatastore
self.__WritePickled(encoded, self.__datastore_file)
File "/home/kostas89/google_appengine/google/appengine/api/datastore_file_stub.py", line 699, in __WritePickled
os.rename(tmp_filename, filename)
OSError: [Errno 21] Is a directory
So I 'm sure that this "way" (which i find in a forum) is totaly wrong. Any suggestion fow how i will put data and maybe how i will retrieve it (but this is another story)? Thanks in advise.
You should assign values to the instance created
class Add(webapp.RequestHandler):
def post(self):
book = Book()
book.title = self.request.get('title')
book.author = self.request.get('author')
book.category = self.request.get('category')
book.put()
It looks like you're specifying a datastore path on the command line to dev_appserver, and the path you're specifying points to a directory, not a file. Try fixing this, or removing the argument altogether.
加载中,请稍侯......
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