Input Validation Tutorial¶

In this section, we are going to learn how inputs are parsed in the Ellar route handle functions.

To get started, we need to create another module for this tutorial.

Open the terminal, navigate to the root level of the project and run the command that scaffolds a new module to your project.

$(venv) ellar create-module items

Next, goto project_name/root_module.py and add ItemsModule to list of modules.

from ellar.common import Module, exception_handler, IExecutionContext, JSONResponse, Response
from ellar.core import ModuleBase
from ellar.samples.modules import HomeModule
from .apps.car.module import CarModule
from .apps.items.module import ItemsModule


@Module(modules=[HomeModule, CarModule, ItemsModule])
class ApplicationModule(ModuleBase):
    @exception_handler(404)
    def exception_404_handler(cls, ctx: IExecutionContext, exc: Exception) -> Response:
        return JSONResponse(dict(detail="Resource not found."))

With the server running:

$(venv) ellar runserver --reload

visit http://localhost:8000/items/,

{
  "detail": "Welcome Items Resource"
}

All code example will be done on the ItemController in project_name/apps/items/controllers.py. Please keep it open.

Tutorial¶

You are going to learn how to use the following route handler parameter: