如何将原始 Sql 查询转换为 Django 模型

Question

我的models.py：

class TheaterShowTimings(models.Model):
    showname = models.CharField(max_length=100)
    showtime = models.TimeField()  # stores only time
    theatershowtimingsid = models.CharField(primary_key=True, max_length=100)
    def __str__(self):
        return self.theatershowtimingsid


class MovieActiveDays(models.Model):
     date = models.DateField()  # stores single only date
     moviedetails = models.ForeignKey(MovieDetails, on_delete=models.CASCADE)
     theaterbase = models.ForeignKey(TheaterBase, on_delete=models.CASCADE)
     activedayid = models.CharField(primary_key=True, max_length=100)
     def __str__(self):
        return self.activedayid

class ActiveShowTimings(models.Model):
     TheaterShowTimings = models.ForeignKey(TheaterShowTimings, on_delete=models.CASCADE)
     MovieActiveDays = models.ForeignKey(MovieActiveDays, on_delete=models.CASCADE)
     activeshowid = models.CharField(primary_key=True, max_length=100)
     def __str__(self):
        return self.activeshowid

我的意见.py：

 show_name_list = TheaterShowTimings.objects.raw('SELECT distinct * FROM Book_TheaterShowTimings where theatershowtimingsid IN (select TheaterShowTimings_id from Book_ActiveShowTimings where MovieActiveDays_id IN (select activedayid from Book_MovieActiveDays where date = "2016-12-19")) order by showtime ASC')

views.py 中的上述查询工作正常。但是，我想将其转换为 django 查询集。请帮帮我，我坚持将原始 sql 查询转换为查询集。

提前致谢。

Answer 1

您可以通过使用ManyToManyField 来实现这一点。

只需要两个步骤：

1. 为TheaterShowTimings 创建一个ManyToManyField 字段movieActiveDays。
2. 使用新的movieActiveDays 字段进行查询。

模型定义

class TheaterShowTimings(models.Model):
    showname = models.CharField(max_length=100)
    showtime = models.TimeField()  # stores only time
    theatershowtimingsid = models.CharField(primary_key=True, max_length=100)
    # many to many fields to MovieActiveDays
    movieActiveDays = models.ManyToManyField('MovieActiveDays', through='ActiveShowTimings')
    def __str__(self):
        return self.theatershowtimingsid

查询：

TheaterShowTimings.objects.filter(movieActiveDays__date='2016-12-19').distinct()