I'm trying to enable form preview with Google App Engine. Getting the following error message I suspect being mistaken somewhere:
... handler = handler_class()
TypeError: __call__() takes at least 2 arguments (1 given)
Can you tell what's wrong with my attempt? Here is some of the code.
from django.contrib.formtools.preview import FormPreview
class AFormPreview(FormPreview):
def done(self, request, cleaned_data):
# Do something with the cleaned_data, then redirect
# to a "success" page.
self.response.out.write('Done!')
class AForm(djangoforms.ModelForm):
text =
forms.CharField(widget=forms.Textarea(attrs={'rows':'11','cols':'70','class':'foo'}),label=_("content").capitalize())
def clean(self):
cleaned_data = self.clean_data
name = cleaned_data.get("name")
if not name:
raise
forms.ValidationError("No name.")
# Always return the full collection of cleaned data.
return cleaned_data
class Meta:
model = A
fields = ['category','currency','price','title','phonenumber','postaladress','name','text','email'] #change the order
...
('/aformpreview/([^/]*)', AFormPreview(AForm)),
UPDATE: Here's a complete app where the preview is not working. Any ideas are most welcome:
import cgi
from google.appengine.api import users
from google.appengine.ext import db
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext.db import djangoforms
class Item(db.Model):
name = db.StringProperty()
quantity = db.IntegerProperty(default=1)
target_price = db.FloatProperty()
priority = db.StringProperty(default='Medium',choices=[
'High', 'Medium', 'Low'])
entry_time = db.DateTimeProperty(auto_now_add=True)
added_by = db.UserProperty()
class ItemForm(djangoforms.ModelForm):
class Meta:
model = Item
exclude = ['added_by']
from django.contrib.formtools.preview import FormPreview
class ItemFormPreview(FormPreview):
def done(self, request, cleaned_data):
# Do something with the cleaned_data, then redirect
# to a "success" page.
return HttpResponseRedirect('/')
class MainPage(webapp.RequestHandler):
def get(self):
self.response.out.write('<html><body>'
'<form method="POST" '
'action="/">'
'<table>')
# This generates our shopping list form and writes it in the response
self.response.out.write(ItemForm())
self.response.out.write('</table>'
'<input type="submit">'
'</form></body></html>')
def post(self):
data = ItemForm(data=self.request.POST)
if data.is_valid():
# Save the data, and redirect to the view page
entity = data.save(commit=False)
entity.added_by = users.get_current_user()
entity.put()
self.redirect('/items.html')
else:
# Reprint the form
self.response.out.write('<html><body>'
'<form method="POST" '
'action="/">'
'<table>')
self.response.out.write(data)
self.response.out.write('</table>'
'<input type="submit">'
'</form></body></html>')
class ItemPage(webapp.RequestHandler):
def get(self):
query = db.GqlQuery("SELECT * FROM Item ORDER BY name")
for item in query:
self.response.out.write('<a href="/edit?id=%d">Edit</a> - ' %
item.key().id())
self.response.out.write("%s - Need to buy %d, cost $%0.2f each<br>" %
(item.name, item.quantity, item.target_price))
class EditPage(webapp.RequestHandler):
def get(self):
id = int(self.request.get('id'))
item = Item.get(db.Key.from_path('Item', id))
self.response.out.write('<html><body>'
'<form method="POST" '
'action="/edit">'
'<table>')
self.response.out.write(ItemForm(instance=item))
self.response.out.write('</table>'
'<input type="hidden" name="_id" value="%s">'
'<input type="submit">'
'</form></body></html>' % id)
def post(self):
id = int(self.request.get('_id'))
item = Item.get(db.Key.from_path('Item', id))
data = ItemForm(data=self.request.POST, instance=item)
if data.is_valid():
# Save the data, and redirect to the view page
entity = data.save(commit=False)
entity.added_by = users.get_current_user()
entity.put()
self.redirect('/items.html')
else:
# Reprint the form
self.response.out.write('<html><body>'
'<form method="POST" '
'action="/edit">'
'<table>')
self.response.out.write(data)
self.response.out.write('</table>'
'<input type="hidden" name="_id" value="%s">'
'<input type="submit">'
'</form></body></html>' % id)
def main():
application = webapp.WSGIApplication(
[('/', MainPage),
('/edit', EditPage),
('/items.html', ItemPage),
('/itemformpreview', ItemFormPreview(ItemForm)),
],
debug=True)
run_wsgi_app(application)
