fix: Adjust min/max items to valid lengths for Set[Enum] fields

[adrianeboyd]

Description

For Set[Enum] fields with a limited maximum length, adjust min_items and max_items to be within the range of valid lengths.

Closes

Fixes #565

[adrianeboyd]

The question from #565 about whether this should raise an error instead or warn in addition remains open.

[adrianeboyd]

I am not really sure whether this is sufficient for handling all possible ways of defining fields with enums? Or whether isinstance(..., EnumMeta) is the best way to check?

[vkcku]

What if we just don't handle this? Instead, we could just raise an exception telling the user the minimum is too large. It might be due to the default set by polyfactory, but this way we can tell the user to change it themselves. I don't really like the idea of us just changing a value without them knowing. I don't think it would be a breaking change either since it currently results in an infinite loop anyway.

[adrianeboyd]

Thanks for the review! I think I addressed all the individual suggestions, although handling Literal seemed clunkier than I expected, so maybe there's a better way to do that?

In terms of raising an error or not, I'm not particularly familiar with polyfactory so it might just be my understanding, but it seems difficult to configure the min/max length on a per-item basis. How would you (easily) set the intended lengths for a model like this?

class WithSetEnum(BaseModel):
    letters: Set[Enum("Letters", ["a", "b", "c", "d", "e", "f"])]
    colors: Set[Enum("Colors", ["red", "green"])]

[vkcku]

Thanks for the review! I think I addressed all the individual suggestions, although handling Literal seemed clunkier than I expected, so maybe there's a better way to do that?

In terms of raising an error or not, I'm not particularly familiar with polyfactory so it might just be my understanding, but it seems difficult to configure the min/max length on a per-item basis. How would you (easily) set the intended lengths for a model like this?

class WithSetEnum(BaseModel):
    letters: Set[Enum("Letters", ["a", "b", "c", "d", "e", "f"])]
    colors: Set[Enum("Colors", ["red", "green"])]

Yeah this is a bit tricky since you'd have to set the min val as 0 and max val as 2. I'm not sure what the best way to go about this would be. You could also have a classmethod for generating the values for that specific field and manually call handle_constrained_collection.

[github-actions[bot]]

Documentation preview will be available shortly at https://litestar-org.github.io/polyfactory-docs-preview/567