Pydantic - Nested Models, JSON Schema and Auto-Generating Models with datamodel-code-generator

In this video, we dive further into the Pydantic library in Python. This is based on the following blog post:

We'll learn a number of things, including:

* How to define nested Pydantic models, forming parent-child relationships that allow us to model complex data that contains relationships.
* Using typing.Literal to constrain values on a field
* Defining default values for fields
* Generating JSON Schema from Pydantic models
* Auto-generating Pydantic models from JSON Schema definitions

📌 𝗖𝗵𝗮𝗽𝘁𝗲𝗿𝘀:
00:00 Intro
03:47 Adding new Pydantic model for nested data
05:19 Adding a link to nested model in parent Pydantic class
07:38 The effect of the Union type on a Pydantic field
10:29 Constraining field values with Python Literal type
12:53 Adding custom validator function to check list length
15:05 JSON Schema outputs with Pydantic models
18:46 Auto-generating Pydantic models from JSON Schema with datamodel-code-generator

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#python #pydantic #datascience

[silkogelman]

Thanks for another great Pydantic tutorial Lyle! 🙏😀
Great tip about possible undesired conversion behaviour at 8:38 and the order of union types.
I'm looking forward to the next one.

[mrrobinhood]

How do you not have more views?! This is great content

[zeinabmeftah]

Great Lesson
Thanx
the typing.Literal tip was very helpful for me .

[MdHasan-khdq]

This is the best explanation. Your tutorial is very helpful for me to understand the topic clearly. I would love to watch a series of FastAPI with Pydantic from you.

[seydinaoumarsamabaly]

Thank you for the effort and just thank you mate 🙌🏾 great tutorial again as usual !

[robertmcdonnell]

Fantastic thanks for this great content

[ShawnMorel]

FYI `schema_json` is deprecated in pydantic v2 and replaced with `model_json_schema`

[JoaoPedroAlvarenga-rfmt]

How can I convert a pydantic model to a json schema and then convert it back into a pydantic model that I can use (no files needed)?

[DreamsAPI]

Hi Cool video, can you share the link to the video for the third video in this series? Thank you for making them.

[malteplath]

5:40 - please don't assign a list (or any mutable type) as a default value. Even if Pydantic probably handles this gracefully, it is a trap for users of the class if they construct Student objects and use append to build the list of modules. Use the field helper class instead.