gel-pydantic-codegen

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gel-pydantic-codegen

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Python Gel/EdgeDB code generator (Pydantic V2 + asyncio, FastAPI compatible)

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// repository documentation

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# gel-pydantic-codegen

This tool generates Python typesafe async code for EdgeQL queries using [Pydantic V2](https://github.com/pydantic/pydantic).

The generated models can be directly used with other libraries such as [FastAPI](https://github.com/tiangolo/fastapi).

This is an alternative to the [built-in code generator](https://github.com/geldata/gel-python/tree/master/gel/codegen) of the official [gel-python](https://github.com/geldata/gel-python/tree/master) library.

**For legacy EdgeDB <v6 support**, check the last [`edgedb-pydantic-codegen` release](https://github.com/Japan7/gel-pydantic-codegen/releases/tag/2025.03.01) and [its PyPI page](https://pypi.org/project/edgedb-pydantic-codegen/).

## Usage

In an Gel initialized project, simply run

```sh
uvx gel-pydantic-codegen <directory>
```

All `*.edgeql` files in `<directory>` and its subdirectories will be processed and the generated code saved next to them.

## Generated code example

```py
from enum import StrEnum

from gel import AsyncIOExecutor
from pydantic import BaseModel, TypeAdapter

EDGEQL_QUERY = r"""
with
  discord_id := <int64>$discord_id,
  moecoins := <optional int32>$moecoins,
  blood_shards := <optional int32>$blood_shards,
  updated := (
    update waicolle::Player
    filter .client = global client and .user.discord_id = discord_id
    set {
      moecoins := .moecoins + (moecoins ?? 0),
      blood_shards := .blood_shards + (blood_shards ?? 0),
    }
  )
select updated {
  game_mode,
  moecoins,
  blood_shards,
  user: {
    discord_id,
    discord_id_str,
  },
}
"""

class WaicolleGameMode(StrEnum):
    WAIFU = "WAIFU"
    HUSBANDO = "HUSBANDO"
    ALL = "ALL"

class PlayerAddCoinsResultUser(BaseModel):
    discord_id: int
    discord_id_str: str

class PlayerAddCoinsResult(BaseModel):
    game_mode: WaicolleGameMode
    moecoins: int
    blood_shards: int
    user: PlayerAddCoinsResultUser

adapter = TypeAdapter(PlayerAddCoinsResult | None)

async def player_add_coins(
    executor: AsyncIOExecutor,
    *,
    discord_id: int,
    moecoins: int | None = None,
    blood_shards: int | None = None,
) -> PlayerAddCoinsResult | None:
    resp = await executor.query_single_json(
        EDGEQL_QUERY,
        discord_id=discord_id,
        moecoins=moecoins,
        blood_shards=blood_shards,
    )
    return adapter.validate_json(resp, strict=False)
```

## Caveats

Currently this tool does not support:

- `TupleType`, `RangeType` and `MultiRangeType` collections
- `std::duration`, `cal::relative_duration`, `cal::date_duration`, `cfg::memory` and `ext::pgvector::vector` objects

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