Handling Nested JSON with Python 3.10 and Marshmallow for Data Validation
After trying multiple solutions online, I still can't figure this out... I'm currently working on a project where I need to validate and deserialize nested JSON data using Marshmallow in Python 3.10. The JSON structure I'm handling looks like this: ```json { "user": { "id": 1, "name": "John Doe", "address": { "street": "123 Elm St", "city": "Gotham", "zip": "12345" } } } ``` I have defined my Marshmallow schemas like this: ```python from marshmallow import Schema, fields, ValidationError class AddressSchema(Schema): street = fields.Str(required=True) city = fields.Str(required=True) zip = fields.Str(required=True) class UserSchema(Schema): id = fields.Int(required=True) name = fields.Str(required=True) address = fields.Nested(AddressSchema) ``` When I try to load the JSON data using the `UserSchema`: ```python import json user_data = json.loads(your_json_string) user_schema = UserSchema() try: result = user_schema.load(user_data) except ValidationError as err: print(err.messages) ``` I'm getting the following behavior: ``` marshmallow.exceptions.ValidationError: {'address': {}} ``` This suggests that the address field isn't being validated correctly, but when I check the input data, it appears valid. I've also confirmed that the `address` field is indeed present and structured correctly. I’ve tried adding more fields to the `AddressSchema` and altering the `required` parameter, but I still get the same behavior. Could someone please guide to understand what might be going wrong here? I'm working on a CLI tool that needs to handle this. I'm working on a API that needs to handle this. Any ideas what could be causing this? Hoping someone can shed some light on this.