django model 条件过滤

from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)
    age = models.IntegerField()

class Publisher(models.Model):
    name = models.CharField(max_length=300)

class Book(models.Model):
    name = models.CharField(max_length=300)
    pages = models.IntegerField()
    price = models.DecimalField(max_digits=10, decimal_places=2)
    rating = models.FloatField()
    authors = models.ManyToManyField(Author)
    publisher = models.ForeignKey(Publisher, on_delete=models.CASCADE)
    pubdate = models.DateField()

class Store(models.Model):
    name = models.CharField(max_length=300)
    books = models.ManyToManyField(Book)

>>> from django.db.models import Avg
>>> Book.objects.all().aggregate(Avg('price'))
{'price__avg': 34.35}

>>> from django.db.models import Sum
>>> Author.objects.aggregate(total_pages=Sum('book__pages'))
{'total_pages': int('4305.00')}

>>> from django.db.models import Max
>>> models.Book.objects.all().aggregate(Max('price'))
{'price__max': int('2154.00')}
>>> models.Book.objects.all().aggregate(a=Max('price'))
{'a': int('2154.00')}

>>> from django.db.models import Count
>>> models.Book.objects.all().aggregate(Count('id'))
{'id__count': 10}

>>> from django.db.models import Count
>>> pubs = Publisher.objects.annotate(num_books=Count('book'))
>>> pubs
<QuerySet [<Publisher: BaloneyPress>, <Publisher: SalamiPress>, ...]>
>>> pubs[0].num_books
73

condtions: {'date': '2018-05-22'}
models.PlayUser.objects.filter(**condtions)

models.SpecialGamesBet.objects.all().distinct()

models.SpecialGamesBet.objects.all().distinct("id") # 只有PostgreSQL数据库才支持这种格式

__exact 精确 等于 like 'aaa'
__iexact 精确 等于 忽略大小写 ilike 'aaa'
__contains 包含 like '%aaa%'
__icontains 包含 忽略大小写 ilike '%aaa%'，但是对于sqlite来说，contains的作用效果等同于icontains。
__gt 大于
__gte 大于等于
__lt 小于
__lte 小于等于
__in 存在于一个list范围内
__startswith 以...开头
__istartswith 以...开头 忽略大小写
__endswith 以...结尾
__iendswith 以...结尾，忽略大小写
__range 在...范围内
__year 日期字段的年份
__month 日期字段的月份
__day 日期字段的日
__isnull=True/False