Examples from https://goessner.net/articles/JsonPath/ don't work about jsonpath HOT 5 CLOSED

I should probably include this to the package description.

from jsonpath.

I haven't implemented a === or a nil / null constant. If you're interessted feel free to implement it 😃
A json object is represented by a map[string]interface{} so $..book[?("isbn" in @)].
In this case $..book[?(@.isbn != "")] should also do the job.

from jsonpath.

No problem.

Jsonpath itself doesn't contain a script language. The examples from goessner use java script (@.length-1)] and (@.price<10).

This lib does not include javascribt but it is build in a way that it can be extended. So you can include a scripting language. Take a look at the gval example. It includes the expression language gval https://github.com/PaesslerAG/gval and is able to evaluate minus and smaller than operators.

from jsonpath.

Thanks! That makes sense.
I'm creating the language using gval.Full(...) now, which works great:

expression := "$..book[?(@.price<10)]"
jsonPathLanguage = gval.Full(jsonpath.Language(), gvalstrings.SingleQuoted())
...
path, err := jsonPathLanguage.NewEvaluable(expression)
...
result, err := path(context.Background(), v)

I realize this questions is probably better suited for gval, but:
Is there a way with gval to simply test for the existence of a field? The expression $..book[?(@.isbn)] will return books where the isbn field is a boolean with value true.

from jsonpath.

I'll try that! Thanks for putting up with me :)

from jsonpath.