Pydantic: How to trigger validation manually on object?

[iedmrc]

Question

Output of python -c "import pydantic.utils; print(pydantic.utils.version_info())":

             pydantic version: 1.5.1
            pydantic compiled: True
                 install path: /usr/local/lib/python3.8/site-packages/pydantic
               python version: 3.8.5 (default, Jul 21 2020, 10:48:26)  [Clang 11.0.3 (clang-1103.0.32.62)]
                     platform: macOS-10.15.6-x86_64-i386-64bit
     optional deps. installed: ['typing-extensions']

Hi, I create a pydantic model that doesn't validate on creation, by using construct() method. But I want to validate on the object after creation, manually. How to trigger validation?
E.g.:

from pydantic import BaseModel
class OrderModel(BaseModel):
    name: str

order = OrderModel.construct()
order.a_method_that_validates_the_model() # I need that function.

I tried, validate() but got TypeError: validate() takes exactly 2 positional arguments (1 given) . I looked at the codebase and seems like this is not I want? because it excepts the model as the first argument and it is a classmethod.

[PrettyWood]

Hello @iedmrc
Here you go

from pydantic import BaseModel, validate_model

def validate(model: BaseModel):
    *_, validation_error = validate_model(model.__class__, model.__dict__)
    if validation_error:
        raise validation_error

validate(order)
# pydantic.error_wrappers.ValidationError: 1 validation error for OrderModel
# name
#   field required (type=value_error.missing)

If you really need to have it as a method and not a function, you could do something like this

from pydantic import BaseModel as PydanticBaseModel, validate_model


class BaseModel(PydanticBaseModel):
    def check(self):
        *_, validation_error = validate_model(self.__class__, self.__dict__)
        if validation_error:
            raise validation_error


class OrderModel(BaseModel):
    name: str

order = OrderModel.construct()

order.check()
# pydantic.error_wrappers.ValidationError: 1 validation error for OrderModel
# name
#   field required (type=value_error.missing)

Hope it helps !

[iedmrc]

Thanks a lot! Do you mind to add this to BaseModel itself?