How to modify the JSON

Hi,

This seem to bee a promising lib for JSON parsing.

How can I modify a JSON structure given a path?

I would like to change:

{'foo': [{'baz': 1}, {'baz': 2}]}

to

{'foo': [{'baz': 3}, {'baz': 2}]}

Given a path: foo[0].baz

I tried:

>>> import jsonpath_rw
>>> json = {'foo': [{'baz': 1}, {'baz': 2}]}
>>> path = jsonpath_rw.parse(r'foo[0].baz')
>>> match = path.find(json)
>>> match
[DatumInContext(value=1, path=Fields('baz'), context=DatumInContext(value={'baz': 1}, path=<jsonpath_rw.jsonpath.Index object at 0x1095a7790>, context=DatumInContext(value=[{'baz': 1}, {'baz': 2}], path=Fields('foo'), context=DatumInContext(value={'foo': [{'baz': 1}, {'baz': 2}]}, path=This(), context=None))))]
>>> match[0].value
1
>>> match[0].value = 5
>>> json
{'foo': [{'baz': 1}, {'baz': 2}]}

I guess I missed something here.

thanks in advance.

Cheers

[kennknowles]

Hello! This is a good point. It is actually where the “rw” in the name of the package comes from: read/write. But I got distracted. The intended design is immutable update:

data = ...
pattern = jsonpath_rw.parse('*.just')
new_data = pattern.update(data, lambda x: ...)
more_new_data = pattern.set(data, "some value")
even_more_new_data = pattern.contextual_update(data, lambda context, x: ...)

There are many useful ways to update:

• A function from old value to new value.
• A constant value to be set (degenerate form of the above).
• A function from old value and some context information to new value.

Pull requests welcome 😃

[ulidtko]

Hi all. It is true that I have no time to maintain this or even really do code review. I am happy to merge a pull request that makes the README point to a newer fork.

Hey, can you please merge #76 ?

Pointing to a newer fork is not really a good way out… Finding a new maintainer and giving them GitHub + PyPi access is. Still, your being around and responding is appreciated.