[Tidy] Improve code style in response models

[lingyielia]

Description

Addressed 2 TODOs in controls.py, as per discussion with @maxschulz-COL, to make response models more consistent in styles

1. make “_create_filter_proxy” a callable class
2. instead of requesting the df_name, we should request the target component name, replace df_name with target_component_name, then later retrieve the df_name from the controllable components. This logic is more aligned with the Vizro usage pattern.

Plus 2 minor cleanup in components.py and layout.py

Screenshot

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[maxschulz-COL]

Hey, thanks for tackling those already - here are my initial thoughts

[maxschulz-COL]

I was more imagining something along the following lines:

from typing import Any


try:
    from pydantic.v1 import BaseModel, Field, create_model
except ImportError:  # pragma: no cov
    from pydantic import BaseModel, Field
    
class FooModel(BaseModel):
    foo: str
    bar: int = 123

class ProxyModel:
    def __new__(cls, color) -> Any:
        return create_model(
            'BarModel',
            apple='russet',
            banana=color,
            __base__=FooModel,
        )
        

Proxy = ProxyModel(color="orange")

print(Proxy.__fields__.keys())
print(Proxy.__fields__.values())

So in the above toy example, Proxy can just act as a normal response model no?

[maxschulz-COL]

I think I do not understand this. Should the logic not be:

• model determines which components should be controlled
• we then check if those components can be controlled, and take a subset at worst
• the remaining dfs are what we get the metadata for (and the could be multiple no?)