You are working on a project that requires the use of a database to store and retrieve data. The project uses the `sqlmodel` library, which provides an ORM (Object-Relational Mapping) for working with databases in Python.

The code snippet provided imports various modules and classes from different files in the project. Here is a breakdown of the imports:

1. `sqlmodel.main.Relationship`: This import is used to define relationships between tables in the database. It allows you to establish associations between different models.

2. `models.common.CreatedAtModel`, `models.common.IDModel`, and `models.common.UpdateAtModel`: These imports are from a file called `common.py` in the `models` directory. They likely define some common functionality or fields that are used across multiple models.

3. `models.point_model.Point` and `models.point_model.PointCreate`: These imports are from a file called `point_model.py` in the `models` directory. These models are specific to handling points in the project.

Your task is to create a new model called `User` in the `models/user_model.py` file. The `User` model should have the following fields:

- `id` (int, primary key, auto-incremented)
- `name` (str)
- `email` (str)
- `created_at` (datetime, auto-generated when the record is created)
- `updated_at` (datetime, auto-generated when the record is updated)

Additionally, you should define a relationship between the `User` model and the `Point` model. Each `User` can have multiple `Point` objects associated with them.

Your solution should include the complete definition of the `User` model in the `models/user_model.py` file. Remember to import any necessary modules or classes.
user
Sure, I'd be happy to help you with that. Here's how you might define the User model with the fields you've specified in `models/user_model.py` using SQLModel:

```python
from typing import Optional

from sqlmodel import Column, PrimaryKey, Field, Relationship
from sqlmodel.ext.declarative import declarative_base

Base = declarative_base()

class User(Base):
    __tablename__ = "users"

    id = Column(Integer, Field(nullable=False), primary_key=True)
    name = Column(String(150))
    email = Column(String(120), unique=True, nullable=False)
    created_at = Column(DateTime, default=Field(func=current_time()))
    updated_at = Column(DateTime, on_update=Field(func=current_time()), nullable=False)

    @relationship(back_populates="user")
    def points(self) -> "Point":
        raise NotImplementedError

    class Config:
        orm_table = __tablename__
```

In this code, I've created a `User` model with a custom `Relationship` decorator. The `points` method will raise a `NotImplementedError` until later when you provide the value of this relationship field in another model called `Point`, like this example:

```python
from typing import List

from sqlmodel import Column, ForeignKey, Relationship, SQLModel
from models.user_model import User

class Point(SQLModel):
    id = Column(Integer, primary_key=True)
    user_id = Column(ForeignKey(User.id), nullable=False)
    name = Column(String(250))
    # ...

    user = Relationship(User, back_populates="points")

    class Config:
        orm_table = "points"
```

This `Point` model uses a `Relationship` annotation where `back_populates` refers to the back-reference to the user relationship. Depending on the database you're using, the `back_populates` attribute may have an extra `xref` prefix in the database schema.

Finally, to create a connection, you would do something like:

```python
from .user_model import Base, User, Point
from sqlalchemy import create_engine, declarative_base, Column, Integer, String, DateTime, Float, ForeignKey
from sqlalchemy.orm import Session, sessionmaker

engine = create_engine(
    "postgresql://user:password@host:port/dbname",
    echo=True,
)
Base.metadata.create_all(engine)

SessionLocal = sessionmaker(bind=engine)

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

def create_point(point: Point) -> Point:
    with get_db() as db:
        db.add(point)
        db.commit()
        return point

async def add_user(user: User) -> User:
    with get_db() as db:
        db.add(user)
        db.commit()
        return user
```

This should ubuntu with a running PostgreSQL database. You can use another SQL engine by changing the `postgresql://...` engine connection URI to a different engine in the same form: `dialer://x/#egg:sqlalchemy.ext.declarative://...`, for instance.

I hope this helps. Let me know if you have any more questions.
assistant
You are working on a project that requires the use of a database to store and retrieve data. The project uses the `sqlmodel` library, which provides an ORM (Object-Relational Mapping) for working with databases in Python.

The code snippet provided imports various modules and classes from different files in the project. Here is a breakdown of the imports:

1. `sqlmodel.main.Relationship`: This import is used to define relationships between tables in the database. It allows you to establish associations between different models.

2. `models.common.CreatedAtModel`, `models.common.IDModel`, and `models.common.UpdateAtModel`: These imports are from a file called `common.py` in the `models` directory. They likely define some common functionality or fields that are used across multiple models.

3. `models.point_model.Point` and `models.point_model.PointCreate`: These imports are from a file called `point_model.py` in the `models` directory. These models are specific to handling points in the project.

Your task is to create a new model called `User` in the `models/user_model.py` file. The `User` model should have the following fields:

- `id` (int, primary key, auto-incremented)
- `name` (str)
- `email` (str)
- `created_at` (datetime, auto-generated when the record is created)
- `updated_at` (datetime, auto-generated when the record is updated)

Additionally, you should define a relationship between the `User` model and the `Point` model. Each `User` can have multiple `Point` objects associated with them.

Your solution should include the complete definition of the `User` model in the `models/user_model.py` file. Remember to import any necessary modules or classes.
user
Sure, here is how you can define the `User` model in the `models/user_model.py` file:

```python
from datetime import datetime
from typing import List

from sqlalchemy import Column, Integer, String, DateTime, ForeignKey
from sqlmodel import SQLModel, Field, Relationship

from .common import CreatedAtModel, IDModel, UpdatedAtModel
from .point_model import Point

class User(IDModel, CreatedAtModel, UpdatedAtModel, SQLModel):
    name: str = Field(sa_column=Column(String(length=100)))
    email: str = Field(sa_column=Column(String(length=100)))
    points: List["Point"] = Relationship(back_populates="user", sa_column=Column(ForeignKey("point.user_id")))
```

In this code:

- We import the necessary modules and classes. `List` is used to define that a user can have multiple points. `ForeignKey` is used to establish the relationship with the `Point` model.
- We define the `User` class that inherits from `IDModel`, `CreatedAtModel`, `UpdatedAtModel`, and `SQLModel`. This gives the `User` model the `id`, `created_at`, and `updated_at` fields.
- We define the `name` and `email` fields as strings.
- We define the `points` field as a relationship with the `Point` model. The `back_populates` argument is used to set up a bidirectional relationship, so that you can access a point's user through `point.user`, and a user's points through `user.points`. The `sa_column` argument is used to specify the foreign key column in the `Point` table that refers to the `User` table.

Please ensure that the `Point` model in `models/point_model.py` has a `user_id` field which is a foreign key to the `User` model. Here is an example of how you can define it:

```python
from typing import Optional

from sqlalchemy import Column, Integer, ForeignKey
from sqlmodel import SQLModel, Field

from .user_model import User

class Point(SQLModel):
    id: Optional[int] = Field(default=None, primary_key=True)
    user_id: int = Field(sa_column=Column(Integer, ForeignKey("user.id")))
    # other fields...

    user: User = Relationship(back_populates="points")
```

In this code, the `user_id` field is a foreign key that refers to the `id` field in the `User` model. The `user` field is a relationship that allows you to access the user associated with a point.
assistant