[FEATURE] support Pydantic BaseModel to "collect" all kwargs, like FastAPI

[odoublewen]

First Check

• I added a very descriptive title here.
• I used the GitHub search to find a similar question and didn't find it.
• I searched the Typer documentation, with the integrated search.
• I already searched in Google "How to X in Typer" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to Typer but to Click.

Commit to Help

• I commit to help with one of those options 👆

Example Code

from typer import Typer
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None

app = Typer()

@app.command("create")
def create_item(item: Item):
    return item

Description

I might be missing something, but wouldn't it be cool if Typer could work like this FastAPI docs example.

This feature request superficially resembles #111 but notice I'm seeking to use a Pydantic BaseModel as THE input for the function, not just as a custom type for one of many args.

I struggled to write a descriptive title that would differentiate it from this other request (which is also well reasoned I think). I think the example code makes it clear what I'm thinking of.

Operating System

Linux, macOS

Operating System Details

No response

Typer Version

0.9.0

Python Version

Python 3.10.11

Additional Context

I love Typer, thanks!

[alex-janss]

This works for me:

@app.command()
class foo_cmd(BaseModel):
    """foo cmd"""
    x: int
    y: bool = False

    def model_post_init(self, _):
        print(f"{self.x=}, {self.y=}")