FormEncode validate: words divided by a comma
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29-09-2019 - |
Question
How to validate words divided by a comma by FormEncode ?
Something like this:
"foo1, foo2, foo3" -> ["foo1", "foo2", "foo3"]
Solution
You'll probably need a custom validator. Here's a quick example:
import formencode
class CommaSepList(formencode.validators.FancyValidator):
def _to_python(self, value, state):
return value.split(",")
def validate_python(self, value, state):
for elem in value:
if elem == "":
raise formencode.Invalid("an element of the list is empty", value, state)
>>> CommaSepList.to_python("1,2,3")
['1', '2', '3']
>>> CommaSepList.to_python("1,,")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python2.5/site-packages/FormEncode-1.2.3dev-py2.5.egg/formencode/api.py", line 416, in to_python
vp(value, state)
File "myValidator.py", line 17, in validate_python
raise formencode.Invalid("an element of the list is empty", value, state)
Of course, you'll want to add validation specific to your use case.
OTHER TIPS
Assuming each word is separated by a comma and a space (', '
):
>>> x = "foo1, bar2, foo3"
>>> x.split(', ')
['foo1', 'bar2', 'foo3']
And then pass that list on to FormEncode and have it do whatever you need it to do.
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