Unexpected behavior validating minimums

[adrianbielsa1]

Hi! I stumbled upon the following situation: validating a number's minimum threshold does not work as intended when said threshold is 0.

The following snippet works as expected, printing "must be greater than 1":

data := float64(1)

err := validation.Validate(data,
    validation.Min(float64(1)).Exclusive(),
)

fmt.Println(err)

However, changing the threshold to 0 nullifies the error:

data := float64(0)

err := validation.Validate(data,
    validation.Min(float64(0)).Exclusive(),
)

fmt.Println(err)

^ prints "<nil>" (i.e. no error).

[call-stack]

When you initialize data as 0 it treat is as an empty value when doing the validation. Hence you are getting nil.

[adrianbielsa1]

Then, how would you validate that a value must be greater than 0?

[call-stack]

You can do something like this. Since it is treating 0 as empty.

data := float64(0)
err := validation.Validate(data,
	validation.Min(float64(0)).Exclusive(),
	validation.NilOrNotEmpty.Error("must be greater than 0"),
)
fmt.Println(err)