from pydantic import BaseModel

fake_users_db = {
    "johndoe": {
        "username": "johndoe",
        "full_name": "John Doe",
        "email": "******@****.***",
        "hashed_password": "fakehashedsecret",
        "disabled": False,
    },
    "alice": {
        "username": "alice",
        "full_name": "Alice Wonderson",
        "email": "******@****.***",
        "hashed_password": "fakehashedsecret2",

from pydantic import BaseModel, EmailStr

app = FastAPI()


class UserIn(BaseModel):
    username: str
    password: str
    email: EmailStr
    full_name: str | None = None


class UserOut(BaseModel):
    username: str
    email: EmailStr
    full_name: str | None = None


@app.post("/user/", response_model=UserOut)
async def create_user(user: UserIn) -> Any:

			</option>
			<la:option value="score.desc">
				<la:message key="labels.search_result_sort_score_desc" />
			</la:option>
			<la:option value="filename.asc">
				<la:message key="labels.search_result_sort_filename_asc" />
			</la:option>
			<la:option value="filename.desc">
				<la:message key="labels.search_result_sort_filename_desc" />
			</la:option>
			<la:option value="created.asc">

			</option>
			<la:option value="score.desc">
				<la:message key="labels.search_result_sort_score_desc" />
			</la:option>
			<la:option value="filename.asc">
				<la:message key="labels.search_result_sort_filename_asc" />
			</la:option>
			<la:option value="filename.desc">
				<la:message key="labels.search_result_sort_filename_desc" />
			</la:option>
			<la:option value="created.asc">

        return pathOfRepositoryMetadata(metadata, metadata.getLocalFilename(repository));
    }

    private String pathOfRepositoryMetadata(ArtifactMetadata metadata, String filename) {
        StringBuilder path = new StringBuilder(128);

        path.append(formatAsDirectory(metadata.getGroupId())).append(PATH_SEPARATOR);
        if (!metadata.storedInGroupDirectory()) {

            // Test with long fileName
            String longFileName = "a".repeat(255); // Maximum typical filename length
            Smb2CloseResponse longNameResponse = new Smb2CloseResponse(mockConfig, testFileId, longFileName);
            assertEquals(longFileName, longNameResponse.getFileName());

            // Test with special characters in fileName

            log.warn("{} exceeds maximum length: {} > {}", fieldName, str.length(), maxLength);
            throw new SmbException(fieldName + " exceeds maximum length: " + str.length());
        }

        // Check for null bytes
        if (str.indexOf('\0') != -1) {
            failedValidations.incrementAndGet();
            log.warn("{} contains null bytes", fieldName);

```Python
UserInDB(
    username="john",
    password="secret",
    email="******@****.***",
    full_name=None,
)
```

或更精准，直接把可能会用到的内容与 `user_dict` 一起使用：

```Python
UserInDB(
    username = user_dict["username"],
    password = user_dict["password"],
    email = user_dict["email"],
    full_name = user_dict["full_name"],
)
```

#### 用其它模型中的内容生成 Pydantic 模型

上例中 ，从 `user_in.dict()` 中得到了 `user_dict`，下面的代码：

                    throw new NoSuchFieldException(fieldName);
                }
                field.setAccessible(true);
                field.set(this, value);
            } catch (Exception e) {
                throw new RuntimeException("Failed to set field " + fieldName, e);
            }
        }

        protected Object getFieldValue(String fieldName) {
            try {
                Field field = null;

    // Helper methods

    private Object getFieldValue(Object obj, String fieldName) {
        try {
            Field field = getField(obj.getClass(), fieldName);
            field.setAccessible(true);
            return field.get(obj);
        } catch (Exception e) {
            throw new RuntimeException("Failed to get field value: " + fieldName, e);
        }
    }