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https://github.com/levsh/pydantic_view

A helper view decorator to construct the child pydantic models
https://github.com/levsh/pydantic_view

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A helper view decorator to construct the child pydantic models

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# Pydantic view helper decorator

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

### Installation
```bash
pip install pydantic_view
```

### Usage

```python
In [1]: from pydantic import BaseModel, Field
...: from pydantic_view import view
...:
...:
...: class User(BaseModel):
...: id: int
...: username: str
...: password: str
...: address: str
...:
...: @view("Create", exclude={"id"})
...: class UserCreate(User):
...: pass
...:
...: @view("Update")
...: class UserUpdate(User):
...: pass
...:
...: @view("Patch")
...: class UserPatch(User):
...: username: str = None
...: password: str = None
...: address: str = None
...:
...: @view("Out", exclude={"password"})
...: class UserOut(User):
...: pass

In [2]: user = User(id=0, username="human", password="iamaman", address="Earth")
...: user.Out()
...:
Out[2]: UserOut(id=0, username='human', address='Earth')

In [3]: User.Update(id=0, username="human", password="iamasuperman", address="Earth")
...:
Out[3]: UserUpdate(id=0, username='human', password='iamasuperman', address='Earth')

In [4]: User.Patch(id=0, address="Mars")
...:
Out[4]: UserPatch(id=0, username=None, password=None, address='Mars')
```

### FastAPI example

```python
from typing import Optional

from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel, ConfigDict, Field

from pydantic_view import view, view_field_validator

class UserSettings(BaseModel):
model_config = ConfigDict(extra="forbid")

public: Optional[str] = None
secret: Optional[str] = None

@view("Out", exclude={"secret"})
class UserSettingsOut(UserSettings):
pass

@view("Create")
class UserSettingsCreate(UserSettings):
pass

@view("Update")
class UserSettingsUpdate(UserSettings):
pass

@view("Patch")
class UserSettingsPatch(UserSettings):
public: str = None
secret: str = None

class User(BaseModel):
model_config = ConfigDict(extra="forbid")

id: int
username: str
password: str = Field(default_factory=lambda: "password")
settings: UserSettings

@view_field_validator({"Create", "Update", "Patch"}, "username")
@classmethod
def validate_username(cls, v):
if len(v) < 3:
raise ValueError
return v

@view("Out", exclude={"password"})
class UserOut(User):
pass

@view("Create", exclude={"id"})
class UserCreate(User):
settings: UserSettings = Field(default_factory=UserSettings)

@view("Update", exclude={"id"})
class UserUpdate(User):
pass

@view("Patch", exclude={"id"})
class UserPatch(User):
username: str = None
password: str = None
settings: UserSettings = None

app = FastAPI()

db = {}

@app.get("/users/{user_id}", response_model=User.Out)
async def get(user_id: int) -> User.Out:
return db[user_id]

@app.post("/users", response_model=User.Out)
async def post(user: User.Create) -> User.Out:
user_id = 0 # generate_user_id()
db[0] = User(id=user_id, **user.model_dump())
return db[0]

@app.put("/users/{user_id}", response_model=User.Out)
async def put(user_id: int, user: User.Update) -> User.Out:
db[user_id] = User(id=user_id, **user.model_dump())
return db[user_id]

@app.patch("/users/{user_id}", response_model=User.Out)
async def patch(user_id: int, user: User.Patch) -> User.Out:
db[user_id] = User(**{**db[user_id].model_dump(), **user.model_dump(exclude_unset=True)})
return db[user_id]

def test_fastapi():
client = TestClient(app)

# POST
response = client.post(
"/users",
json={
"username": "admin",
"password": "admin",
},
)
assert response.status_code == 200, response.text
assert response.json() == {
"id": 0,
"username": "admin",
"settings": {"public": None},
}

# GET
response = client.get("/users/0")
assert response.status_code == 200, response.text
assert response.json() == {
"id": 0,
"username": "admin",
"settings": {"public": None},
}

# PUT
response = client.put(
"/users/0",
json={
"username": "superadmin",
"password": "superadmin",
"settings": {"public": "foo", "secret": "secret"},
},
)
assert response.status_code == 200, response.text
assert response.json() == {
"id": 0,
"username": "superadmin",
"settings": {"public": "foo"},
}

# PATCH
response = client.patch(
"/users/0",
json={
"username": "guest",
"settings": {"public": "bar"},
},
)
assert response.status_code == 200, response.text
assert response.json() == {
"id": 0,
"username": "guest",
"settings": {"public": "bar"},
}
```