Filters are not implemented per spec

[SimplicityGuy]

jsonpath2 version

0.4.4

Platform Details

macOS Catalina, Python 3.8.4

Scenario:

In test case 10, you have:

expr = Path.parse_str('$..book[*][?(@.author = "Nigel Rees")]')

This seems correct. The behavior in jsonpath2 is correct though in http://jsonpath.com the behavior is different and is incorrect.

Another query that should result in the same results is:

expr = Path.parse_str('$..book[?(@.author = "Nigel Rees")]')

This should return a list of dict that filters only the author. In jsonpath2 this yields no results (and empty list). Yet on http://jsonpath.com, this works fine.

My understanding of the JsonPath spec is that this second query is valid and should result in what jsonpath2 is doing in test case #10. This understanding comes from the section on the JsonPath spec:

//book[price<10]	$..book[?(@.price<10)]	filter all books cheapier than 10

[markborkum]

@SimplicityGuy The behavior of jsonpath2 differs from the original JSONPath spec.

In jsonpath2, the value at "$..book" is a JSON array and the value at "$..book[*]" is a JSON object; whereas, in the original JSONPath spec, the value at "$..book" would be a JSON object.

The difference in behavior means that, in jsonpath2, both the JSON array and its elements are uniquely identifiable; whereas, in the original JSONPath spec, the JSON array is not identifiable.

[SimplicityGuy]

Makes sense; thank you for the explanation!