8000 📝 Add deprecation info block about `dict()` in `docs/tutorial/body.md` by jomkv · Pull Request #13906 · fastapi/fastapi · GitHub
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tiangolo merged 3 commits into from
Aug 31, 2025
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📝 Add deprecation info block about dict() in docs/tutorial/body.md #13906

tiangolo merged 3 commits into from
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@jomkv jomkv commented Jul 20, 2025 •
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Description

Updates docs for https://fastapi.tiangolo.com/tutorial/body/#use-the-model with an info about .dict() being deprecated, and that .model_dump() should be used instead.

Refer to discussion #13904 for more details.

Change Preview (refer to the info at the bottom)

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@github-actions github-actions bot added the docs Documentation about how to use FastAPI label Jul 20, 2025
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github-actions bot commented Jul 20, 2025

📝 Docs preview for commit 425ebbe at: https://ca0653c7.fastapitiangolo.pages.dev

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YuriiMotov commented Jul 20, 2025

@jomkv, thanks for you interest!

I remember I saw such note somewhere. I think it would be nice to find it and use the same wording for consistency.
Could you please try to find it?

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jomkv commented Jul 20, 2025

@jomkv, thanks for you interest!

I remember I saw such note somewhere. I think it would be nice to find it and use the same wording for consistency. Could you please try to find it?

I actually just copied it from there :) forgot to mention that, sorry. Here is where I found it, just below the code snippet of "Multiple Models".

@YuriiMotov YuriiMotov changed the title 📝 Add deprecated info for dict() in Request Body 📝 Add deprecation info block about dict() in docs/tutorial/body.md Jul 21, 2025
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LGTM

I checked the wording is exactly the same that is used in other places, and this is the only place where .dict() is used without such warning

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📝 Docs preview for commit ee015cf at: https://eb1f194c.fastapitiangolo.pages.dev

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Shihasz commented Jul 30, 2025

Pydantic V2 is released long ago and fastapi is no more using V1. I think it is better to change code itself to use model_dump() instead of dict() method which is deprecated already and not recommended to be used in especially in tutorials for new users of the framework. If absolutely necessary, note/info can be added about the method dict() had to be used in v1.

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YuriiMotov commented Jul 30, 2025

Pydantic V2 is released long ago and fastapi is no more using V1. I think it is better to change code itself to use model_dump() instead of dict() method which is deprecated already and not recommended to be used in especially in tutorials for new users of the framework.

FastAPI still supports Pydantic V1 and all code examples from docs are tested with both, Pydantic V1 and V2.
If we change it to .model_dump() then tests with Pydantic V1 will fail.
We could solve this by creating separate code examples for Pydantic V1 and V2 and showing V2 version by default.

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Great, thanks! 🚀

@tiangolo tiangolo enabled auto-merge (squash) August 31, 2025 10:56
@tiangolo tiangolo merged commit 4584f70 into fastapi:master Aug 31, 2025
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    📝 Fix code include for Pydantic models example in `docs/zh/docs/python-types.md` (fastapi#13997)

    Updated the Pydantic expiration example in the Chinese documentation
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