Viewing github.com/django/django-stable-4.1.x/tests/filtered_relation/models.py

from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation

from django.contrib.contenttypes.models import ContentType

```
from django.db import models
```
```
class Author(models.Model):
```

    name = models.CharField(max_length=50, unique=True)

    favorite_books = models.ManyToManyField(

```
        "Book",
```

        related_name="preferred_by_authors",

        related_query_name="preferred_by_authors",

```
    )
```

    content_type = models.ForeignKey(ContentType, models.CASCADE, null=True)

    object_id = models.PositiveIntegerField(null=True)

    content_object = GenericForeignKey()

```
class Editor(models.Model):
```

    name = models.CharField(max_length=255)

```
class Book(models.Model):
```
```
    AVAILABLE = "available"
```
```
    RESERVED = "reserved"
```
```
    RENTED = "rented"
```
```
    STATES = (
```
```
        (AVAILABLE, "Available"),
```
```
        (RESERVED, "reserved"),
```
```
        (RENTED, "Rented"),
```
```
    )
```

    title = models.CharField(max_length=255)

```
    author = models.ForeignKey(
```
```
        Author,
```
```
        models.CASCADE,
```
```
        related_name="books",
```
```
        related_query_name="book",
```
```
    )
```

    editor = models.ForeignKey(Editor, models.CASCADE)

    generic_author = GenericRelation(Author)

    state = models.CharField(max_length=9, choices=STATES, default=AVAILABLE)

```
class Borrower(models.Model):
```

    name = models.CharField(max_length=50, unique=True)

```
class Reservation(models.Model):
```
```
    NEW = "new"
```
```
    STOPPED = "stopped"
```
```
    STATES = (
```
```
        (NEW, "New"),
```
```
        (STOPPED, "Stopped"),
```
```
    )
```
```
    borrower = models.ForeignKey(
```
```
        Borrower,
```
```
        models.CASCADE,
```
```
        related_name="reservations",
```

        related_query_name="reservation",

```
    )
```
```
    book = models.ForeignKey(
```
```
        Book,
```
```
        models.CASCADE,
```
```
        related_name="reservations",
```

        related_query_name="reservation",

```
    )
```

    state = models.CharField(max_length=7, choices=STATES, default=NEW)

```
class RentalSession(models.Model):
```
```
    NEW = "new"
```
```
    STOPPED = "stopped"
```
```
    STATES = (
```
```
        (NEW, "New"),
```
```
        (STOPPED, "Stopped"),
```
```
    )
```
```
    borrower = models.ForeignKey(
```
```
        Borrower,
```
```
        models.CASCADE,
```

        related_name="rental_sessions",

        related_query_name="rental_session",

```
    )
```
```
    book = models.ForeignKey(
```
```
        Book,
```
```
        models.CASCADE,
```

        related_name="rental_sessions",

        related_query_name="rental_session",

```
    )
```

    state = models.CharField(max_length=7, choices=STATES, default=NEW)

```
class Seller(models.Model):
```

    name = models.CharField(max_length=255)

```
class Currency(models.Model):
```

    currency = models.CharField(max_length=3)

```
class ExchangeRate(models.Model):
```
```
    rate_date = models.DateField()
```
```
    from_currency = models.ForeignKey(
```
```
        Currency,
```
```
        models.CASCADE,
```
```
        related_name="rates_from",
```
```
    )
```
```
    to_currency = models.ForeignKey(
```
```
        Currency,
```
```
        models.CASCADE,
```
```
        related_name="rates_to",
```
```
    )
```

    rate = models.DecimalField(max_digits=6, decimal_places=4)

```
class BookDailySales(models.Model):
```

    book = models.ForeignKey(Book, models.CASCADE, related_name="daily_sales")

```
    sale_date = models.DateField()
```

    currency = models.ForeignKey(Currency, models.CASCADE)

    seller = models.ForeignKey(Seller, models.CASCADE)

    sales = models.DecimalField(max_digits=10, decimal_places=2)

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