[FE-discuss] validating set of integers

[Lukasz Michalski]

Hi,

Does anyone have an example how to validate set of integers from input
string?

validators.OneOf[1,2,3,4,5] throws an exception when '1' is passed.
validators.Int() AFAIK does not allow to specify set of valid values.

Is there any method to combine those two?

Thanks,
Łukasz

[Chris Lambacher]

Hi Łukasz,

I'll assume that 'validators.OneOf[1,2,3,4]' was a typo and that you meant
validators.OneOf([1,2,3,4]).

You need to combine two validators using either All or Pipe (see
http://www.formencode.org/en/latest/modules/compound.html).

Post by Lukasz Michalski

from formencode import validators, Pipe
pv = Pipe(validators.Int(), validators.OneOf([1,2,3,4]))
pv.to_python('1')

1

All is the same but you need to put the validators in reverse order that

Post by Lukasz Michalski

from formencode import validators, All
av = All(validators.OneOf([1,2,3,4]), validators.Int())
av.to_python('1')

1

Post by Lukasz Michalski

from formencode import Invalid

... av.to_python('b')
... except Invalid, e:
... print e
...
Please enter an integer value


-Chris

Post by Lukasz Michalski
Hi,
Does anyone have an example how to validate set of integers from input
string?
validators.OneOf[1,2,3,4,5] throws an exception when '1' is passed.
validators.Int() AFAIK does not allow to specify set of valid values.
Is there any method to combine those two?
Thanks,
Łukasz
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[Łukasz Michalski]

Hi Łukasz,
I'll assume that 'validators.OneOf[1,2,3,4]' was a typo and that you
meant validators.OneOf([1,2,3,4]).
You need to combine two validators using either All or Pipe (see
http://www.formencode.org/en/latest/modules/compound.html).

Many thanks. Somehow I forgot about All(), but you are right, Pipe is
more intuitive.

Thanks again,
Łukasz