A Flask Of Marshmallows
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An introduction to Marshmallows library for Python (https://marshmallow.readthedocs.io/en/latest/). Shown in the context of Python Flask API and how the library enables easier testing.
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A Flask Of Marshmallows
- 1. A Flask O’ Marshmallows Gavin Wiener 4 Nov 2017
- 2. WHO AM I
- 3. GOALS ➔ An introduction, not a tutorial ➔ Where you could find use of Marshmallow ➔ Show some love for open-source
- 4. LAY OF OUR LAND Mobile iOS/AndroidBackend
- 5. LAY OF OUR LAND Mobile iOS/AndroidBackend
- 6. WHY MARSHMALLOW FOR US ➔ Maintaining a custom framework is tiresome ➔ Above had no type validation ➔ Missing keys makes our clients :( ➔ Testing was difficult
- 7. “ https://marshmallow.readthedocs.io/en/latest/ “marshmallow is an Object-relational mapping (ORM) library for converting complex datatypes, such as objects, to and from native Python datatypes”
- 13. CAVEATS ➔ Order is not guaranteed ➔ Post loads do not fire if validation does not pass ➔ Conversion is hard-headed e.g. Str to Int, no Int to Str
- 14. OUR FLOW ➔ Receive JSON string from backend ➔ Transform with Schema, `.loads()` ➔ Send payload
- 15. IDEAL FLOW ➔ Receive JSON string from backend ➔ Validate Schema, `validate()` ➔ Send payload
- 16. ERROR RESPONSES `.load()` .errors and `validate`
- 17. ERROR RESPONSES - Validation
- 18. ERROR RESPONSES - Annotation
- 19. ERROR RESPONSES - Custom
- 20. ERROR RESPONSES - Custom
- 21. ERROR RESPONSES - Halt
- 22. FLOW W/ ERROR RESPONSES ➔ Receive JSON string from backend ➔ Validate or Load ◆ Raise `Exception` if errors exist ➔ Send payload
- 23. TESTING ➔ Test the Schemas in isolation ➔ Any deviation in a known input and expected output for that Schema ➔ Individually test methods ◆ Identify where a Schema is failing
- 24. TESTING Test individual Schema methods
- 25. LAST THOUGHTS Legacy models Breaking code into small chunks is difficult
- 26. EXTRA ➔ Many integrations; MongoEngine, SQLAlchemy, Flask ➔ Custom fields; formatting, function, lambdas https://github.com/marshmallow-code/marshmallow/wiki/Ecosystem
- 27. SUMMARY ➔ Schemas for validation or validation ◆ Simplified Schemas ➔ Testing ◆ Testing individual methods ◆ Schemas