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4b977a5d72
This moves the behaviors of `order_by` used in Postgres aggregates into the `Aggregate` class. This allows for creating aggregate functions that support this behavior across all database engines. This is shown by moving the `StringAgg` class into the shared `aggregates` module and adding support for all databases. The Postgres `StringAgg` class is now a thin wrapper on the new shared `StringAgg` class. Thank you Simon Charette for the review.
50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
from django.db import models
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class Author(models.Model):
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name = models.CharField(max_length=100)
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age = models.IntegerField()
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friends = models.ManyToManyField("self", blank=True)
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rating = models.FloatField(null=True)
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def __str__(self):
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return self.name
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class Publisher(models.Model):
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name = models.CharField(max_length=255)
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num_awards = models.IntegerField()
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duration = models.DurationField(blank=True, null=True)
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def __str__(self):
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return self.name
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class Book(models.Model):
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isbn = models.CharField(max_length=9)
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name = models.CharField(max_length=255)
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pages = models.IntegerField()
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rating = models.FloatField()
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price = models.DecimalField(decimal_places=2, max_digits=6)
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authors = models.ManyToManyField(Author)
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contact = models.ForeignKey(Author, models.CASCADE, related_name="book_contact_set")
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publisher = models.ForeignKey(Publisher, models.CASCADE)
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pubdate = models.DateField()
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def __str__(self):
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return self.name
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class Store(models.Model):
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name = models.CharField(max_length=255)
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books = models.ManyToManyField(Book)
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original_opening = models.DateTimeField()
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friday_night_closing = models.TimeField()
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def __str__(self):
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return self.name
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class Employee(models.Model):
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work_day_preferences = models.JSONField()
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