JSON field do not survive import & export.

Describe the bug JSON fields do not survive import/export.

To Reproduce Steps to reproduce the behavior:

1. Have a model with a JSON field containing some JSON e.g. {"a":"b"}
2. Export using format CSV, JSON or TSV.
3. Open up new environment.
4. Import previous file
5. the json field contains the JSON in quotations and single quotes "{'a':'b'}"

Versions (please complete the following information):

• Django Import Export: 2.4.0
• Python 3.9
• Django 3.1.2

Expected behavior The field should have the same content as before.

[BSVogler]

@aureliendebord

I call this method when I run into a type error when using this field post-import.

def repair_json(djangoobject, field: str):
    """
    Repairs broken import/export strings.
    @param djangoobject: the broken django object, has side effect, as it might be repaired
    @param field: name of the field to repair
    @return:
    """
    # check if there is a chance that it is broken
    if hasattr(djangoobject, field) and (
            type(getattr(djangoobject, field)) == JSONString or type(getattr(djangoobject, field)) == str):
        jsonstring = getattr(djangoobject, field)
        jsonstring = jsonstring.removeprefix("\"")
        jsonstring = jsonstring.removesuffix("\"")
        jsonstring = jsonstring.replace("\'", "\"")
        jsonstring = jsonstring.replace("\\\"", "\"")
        jsonstring = jsonstring.replace("False", "false")
        jsonstring = jsonstring.replace("True", "true")
        setattr(djangoobject, field, json.loads(jsonstring))
        # even if validation will fail, this was improved
        djangoobject.save()

[matthewhegarty]

Hi @takkaria

Many thanks for the update on this issue. Based on the fact that neither of us can reproduce this in 2.6.1 I will close the issue.