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I think the issue with schemas.py is also present in the e-book (https://rest-apis-flask.teclado.com/docs/flask_smorest/marshmallow_schemas/#writing-the-itemschema), could you check it out and see if there are any other places where this happens?

I think there might be a few more places where store_id = fields.Int(...) should be changed to fields.Str(...):

• 05_flask_smorest/09_decorating_responses/start/schemas.py
• 05_flask_smorest/08_validation_with_marshmallow/end/schemas.py
• 05_flask_smorest/08_validation_with_marshmallow/start/schemas.py
• 05_flask_smorest/07_marshmallow_schemas/end/schemas.py
• 06_sql_storage_sqlalchemy/02_create_simple_sqlalchemy_model/start/schemas.py

But have an in-depth look and make sure there aren't any others as well! 💪