Data Validation

Seamless makes it easy to validate data when linking actions between the client and the server using the pydantic library.

If pydantic is installed, Seamless will automatically validate the data sent between the client and the server.

Here is an example of how to use pydantic to validate data:

Example of using Pydantic to validate data

from pydantic import BaseModel
from seamless import Component, Form, Input, Button
from seamless.types.events import SubmitEvent

class MyForm(Form):
    class UserLogin(BaseModel):
        username: str
        password: str
        remember_me: bool

    def render(self):
        return Form(on_submit=self.on_submit)(
            Input(name="username"),
            Input(name="password"),
            Button(type="submit")(
                "Submit"
            )
        )

    def on_submit(self, data: SubmitEvent[UserLogin]):
        print(data)

This will create a form with the fields username, password, and remember_me, and a submit button.

When the form is submitted, the data will be validated using the UserLogin model from pydantic. If the data is invalid, an error will be returned to the client.

Note

If pydantic is not installed, Seamless will not validate the data sent between the client and the server but will convert the data from dict to an object.