Set WIDGET_MAP for model resources to handle JSON fields

backports #9307

fixes #9324

(cherry picked from commit 225360c)

CHANGES/plugin_api/9324.bugfix

@@ -0,0 +1,3 @@
+Set the default widget type to ``JSONWidget`` for ``JSONFields`` for Model Resources to fix
+django-import-export bug where ``django.db.models.JSONFields`` weren't properly handled.
+(backported from #9307)

pulpcore/plugin/importexport.py

@@ -1,4 +1,5 @@
 from import_export import resources
+from import_export.resources import widgets
 
 
 class QueryModelResource(resources.ModelResource):
@@ -19,6 +20,11 @@ class QueryModelResource(resources.ModelResource):
             (driven by repo_version)
     """
 
+    # TODO: remove this when https://git.io/JEgMp is released
+    # This forces JSONField to map to JSONWidget as django-import-export does not properly handle
+    # JSONField from django.db.models in django-import-export 2.5.0
+    WIDGETS_MAP = {**resources.ModelResource.WIDGETS_MAP, **{"JSONField": widgets.JSONWidget}}
+
     def set_up_queryset(self):
         return None