Here's an example.
# =====================
from formencode import Schema, Invalid
from formencode.validators import UnicodeString, Int
from webob import Request
class StrictSchema(Schema):
allow_extra_fields = False
class IntegerTestSchema(StrictSchema):
testfield = Int(not_empty=True)
class StringTestSchema(StrictSchema):
testfield = UnicodeString(not_empty=True)
# Testing.
# =====================
req = Request.blank('/?testfield=111')
print IntegerTestSchema.to_python(req.params)
# This raises an exception
req = Request.blank('/?testfield=111&testfield=222')
try:
IntegerTestSchema.to_python(req.params)
except Invalid as e:
print "Caught Exception: {0}".format(e)
req = Request.blank('/?testfield=aaa')
print StringTestSchema.to_python(req.params)
# This will be passed successfully (!)
# The output will be {'testfield': u"[u'aaa', u'bbb']"}
req = Request.blank('/?testfield=aaa&testfield=bbb')
print StringTestSchema.to_python(req.params)
# ========================
Please note we do not use formencode.ForEach() or formencode.Set()
here. I think this is very unclear behaviour.
Imagine an UsernameValidator (or something related to "not-so-strict-
string-validator"). Instead of indicating an input error, we show the
service realization details to our users -- "{'username': u"[u'John',
u'Mike']"}" - "Ok. This is Python list inside the dict".
According to WebOb documentation (http://pythonpaste.org/webob/
#multidict), we probably should use request.GET.getone() instead of
request.GET.getall().
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