如何将原始Sql查询转换为Django模型

Question

My 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

My views.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')

The above query in views.py is working fine. But, I want to convert it into a django queryset. please help me, I`m stuck at converting that raw sql query to queryset.

Thanks in advance.

Answer 1

You can achieve this by making use of ManyToManyField .

Only two steps is needed:

1. Create a ManyToManyField fields movieActiveDays for TheaterShowTimings .
2. Make query with the new movieActiveDays field.

Model definition

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

Query:

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