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User.get_username()
User
represents the complete table, not the record. This is why you get an error.
So remove:
username = User.get_username()
A user might be able to change their username in your application, you can save a foreign key to the user instead. When you save the form do this:
if form.is_valid():
print ('valid form')
bet = form.save(commit=False) # the bet isn't saved just yet
bet.user = request.user # you add the user here
print bet.user.username
bet.save() # finally save the bet in the database
In your Bet model, you need to add a field to record the user. For example:
class Bet(models.Model):
...
user = models.ForeignKey(to=User, related_name="bets", blank=True, null=True)
...
Source:stackexchange.com