How can i make a Query through Many-To-Many-Relationship - django

Question

I want to display the trainer for a course date. A course can have several dates and a different trainer can be used on each date. A trainer can have a different role on each course date. (Instructor, helper...)
How do I make the correct query? Are the models correct for this?
Models:
class Course_dates(models.Model):
date = models.DateField()
start = models.TimeField()
end = models.TimeField()
def __str__(self):
return str(self.id)
"""return self.date.strftime("%d.%m.%Y")"""
class Course(models.Model):
course_number = models.CharField(max_length=24, blank=True)
course_location = models.ForeignKey(Course_location, on_delete=models.CASCADE)
course_dates = models.ManyToManyField('Course_dates', through="Course_Course_dates")
def __str__(self):
return self.course_number
class Trainer_Course_Course_date_role(models.Model):
trainer = models.ForeignKey(Trainer, on_delete=models.CASCADE)
role = models.CharField(max_length=24, blank=True)
def __str__(self):
return str(self.id)
class Course_Course_dates(models.Model):
course = models.ForeignKey(Course, on_delete=models.CASCADE)
course_dates = models.ForeignKey(Course_dates, on_delete=models.CASCADE)
trainer = models.ForeignKey(Trainer_Course_Course_date_role, on_delete=models.CASCADE, null=True)
def __str__(self):
return str(self.id)
class Trainer(models.Model):
salutation = models.CharField(max_length=8,choices=GENDER_CHOICES)
last_names = models.CharField(max_length=56)
first_names = models.CharField(max_length=56)
date_of_birth = models.DateField()
address = models.ForeignKey(Address, on_delete=models.CASCADE)
email = models.EmailField()
phone = models.CharField(max_length=56, blank=True)
mobile = models.CharField(max_length=56, blank=True)
def __str__(self):
return self.last_names
View:
def course(request):
courses = Course.objects.all()
course_list = []
for course in courses:
sorted_date_list = course.course_dates.all().order_by('date')
course_list.append({'course': course, 'sorted_date_list': sorted_date_list })
context = { 'course_list': course_list, }
return render(request, 'kursverwaltung_tenant/course.html', context)