Yesod Esqueleto isJust

Question

I've been using isNothing, from Esqueleto, but now I would like to just test if it is not null, I've noticed that there is no isJust, I would like to know the reason it doesn't exist, and what could I do to achieve similar effect: isJust (a ^. MyEntityMyField)

score 3 · Accepted Answer · answered May 27 '16 at 13:58

3

Can't you define it yourself?

isJust = not_ . isNothing

answered May 27 '16 at 13:58

Daniel Martin

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It seems like the library should define it. Maybe open an issue @FtheBuilder? – MaxGabriel May 27 '16 at 17:42
@MaxGabriel I will open – FtheBuilder May 27 '16 at 18:42
1

@Daniel Martin I've defined it myself, I posted just to help others with similar problems... – FtheBuilder May 28 '16 at 18:41

Yesod Esqueleto isJust

1 Answers1