CODEWITHSUNDEEP
pythonvalidationbooleanschemacerberus
Hou Lu
Hou Lu

Reputation: 3232

Using cerberus in Python to validate boolean values

I'm trying to use Cerberus in Python to validate some data.
I found out that for 'boolean' type, the validator always return True, like this: 

import cerberus
bool_schema = {'name': {'type': 'boolean', 'required': True}}
cerberus.schema_registry.add('bool_schema', bool_schema)

v = cerberus.Validator({'name': {'schema': 'bool_schema'}})
test1 = {'name': 'a'}
test2 = {'name': 0}
print(v.validate(test1))
print(v.validate(test2))

The above code prints two Trues.
Actually, what I need is to validate if the value is True or False (bool type in Python), other values should not pass the validator.

Upvotes: 2

Views: 4240

Answers (2)

Nicola Iarocci
Nicola Iarocci

Reputation: 6576

Might be an issue with the schema registry (I opened a ticket so we can investigate it further - will report back here).

In the meantime, you can skip the registry and it will work just fine:

from cerberus import Validator

schema = {'name': {'type': 'boolean', 'required': True}}

v = Validator()
v.validate({'name': 'a'})
False

v.errors
{'name': ['must be of boolean type']}

EDIT for future readers: the answer from @funky-future below actually explains why your code was failing, and how to fix it.

Upvotes: 2

funky-future
funky-future

Reputation: 3968

This is a semantically issue. Though you didn't specify explicitly what you want to achieve, I'm assuming you want to test whether the value mapped to name in a dictionary is a boolean and ensure it is present.

In line 4 of your example code you're defining a schema that refers to a previously defined schema from a schema registry. While validation it will be interpreted as

{'name': 
    {'schema': {
       {'type': 'boolean',
        'required': True}
}}}

The second-level schema rule will only be processed if the value of name is a mapping. In each of your examples this is not the case, which will effectively process no rule at all and thus the validation returns True each time.

In order to answer the question I assumed above, this will cover it:

import cerberus
required_boolean = {'type': 'boolean', 'required': True}
cerberus.rules_set_registry.add('required_boolean', required_boolean)
v = cerberus.Validator({'name': 'required_boolean'})

Upvotes: 3

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