I'm using SQLAlchemy with Pylons and am having trouble validating
data. I have an App object mapped to a table with a unique constraint
on App.number.
Here's some code:
q = Session.query(App)
if app_id:
q = q.filter_by(id=app_id).first()
if q:
c.app = q
number = request.params.get('number')
notes = request.params.get('notes')
if appmodel and number:
try:
q.number = number
q.notes = notes
Session.save(q)
Session.commit()
c.message = 'Record updated'
except:
# restore pre-form data ?? how??
c.message = 'Error updating record'
return render('index.mtl')
else:
return self.index()
My questions are:
1) When I do the try statement, the value of q.number changes to
whatever the user passed in via the form -- even if it's invalid, so
that when I render the page, the invalid value is used. How do I
reset the object to have the values it had before I did the try? Do I
have to get it afresh from the db?
2) How do I let the user know which value caused the record not to
update? What information does SQLAlchemy provide back that I can use
to say: "You're number must be unique... and such-and-such must be
greater than 0, etc..?"
Thanks,
Matt Haggard
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