Require at least one collection to not be empty

Asked Apr 11 '22 at 18:32

Active Apr 11 '22 at 18:32

Viewed 39 times

Using FluentValidation, I need to require that at least 1 collection out of 3 is not empty. This is the best way I can think to do this at the moment:

RuleFor(x => x).Must(x => x.Required.Any() || x.Ignored.Any() || x.Preferred.Any());

The type being validated is defined as:

public record ReleaseProfileData(
    string Name,
    [JsonProperty("trash_id")] string TrashId,
    bool IncludePreferredWhenRenaming,
    IReadOnlyCollection<TermData> Required,
    IReadOnlyCollection<TermData> Ignored,
    IReadOnlyCollection<PreferredTermData> Preferred
);

Is there a more "fluent" (idiomatic) way of expressing this type of rule? If so, could you provide an example?

asked Apr 11 '22 at 18:32

void.pointer

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There's an alternative using `Unless` [on this post](https://stackoverflow.com/a/21115780/1043380), but what you have seems good enough. – gunr2171 Apr 11 '22 at 18:37
Does the `PreferredTermData` type inherit from `TermData`? – gunr2171 Apr 11 '22 at 18:40
@gunr2171 It does not. It uses composition, though. – void.pointer Apr 11 '22 at 19:05

Require at least one collection to not be empty

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