Property XXXX is not multi-line exception in python GAE

Question

I have a simple model object with

profilename = db.StringProperty()

and when I get a string with "Some More" and try to

put

it in model it throws exception

Property profilename is not multi-line

Is space equivalent to newline or I have missed something here? It is

put ting

for single word strings without spaces.

Answer 1

The check's being done at application level, specifically in StringProperty.validate -- the code in question (which you can find in your SDK's sources in ext/db/init.py) is:

if not self.multiline and value and value.find('\n') != -1:
  raise BadValueError('Property %s is not multi-line' % self.name)

so there's no way it can be triggered unless a \n has indeed found its way into the value you're passing in. To help you debug the issue, use

logging.info('value is: %r', value)

just before the put that's giving you problems -- what do you see in the logs as a result? The %r format specifier shows the repr of your string, so you'll be able to observe where's the pesky \n that shouldn't ever be there, and, from that info, debug the issue.