Simple query doesn't work

[retr0h]

I can't seem to make a simple query work.

jsonpath2 version

jsonpath2==0.4.1

Platform Details

Mac OS

Steps to Reproduce:

import json
import jsonpath2 as jsonpath

k = {'foo': ['bar', 'baz']}

j = json.dumps(k)
__filter = '$.foo[0]'

print([m.current_value for m in jsonpath.match(__filter, j)])

Output

[jodewey:~/git/ansiblectl]   : host-filtering(+25/-2)+* ± python ansiblectl/cmd/test.py
[]

Changing the filter to '$' results in:

['{"foo": ["bar", "baz"]}']

Ultimately I'm trying to simply query a list but nothing seems to work.

import json
import jsonpath2 as jsonpath

k = ['bar', 'baz']

j = json.dumps(k)
__filter = '$[0]'

print([m.current_value for m in jsonpath.match(__filter, j)])

[jodewey:~/git/ansiblectl]   : host-filtering(+25/-2)+* ± python ansiblectl/cmd/test.py
[]

These queries work perfectly fine on https://jsonpath.com/

[markborkum]

@retr0h, Thanks for getting in touch!

In the steps to reproduce, the match method is evaluated with the string j as the second argument and not the dict k, where j is the JSON serialization of k. The string j does not have a "foo" attribute, so the result set is empty.

The following code should give the expected result:

import jsonpath2 as jsonpath

k = {'foo': ['bar', 'baz']}

__filter = '$.foo[0]'

print([m.current_value for m in jsonpath.match(__filter, k)])
# => ['bar']

[retr0h]

Thanks @markborkum