Maintaining multiple instance of the same object in Django models - django

Question

I am creating a small app in Django where I need to maintain details of training batches of different courses. Each of these batches will have a list of topics to be covered. For e.g, A python course could be conducted by different trainers in different colleges at the same time and so they both will have their own list of topics. Following is what I have come up with but think I am wrong. I am confused about how to go about it. Kindly suggest the right approaches.
My Models so far,
class Course(models.Model):
name = models.CharField(max_length=50, default="Enter Course Name")
class Trainer(models.Model):
name = models.CharField(max_length=50, default="Enter Trainer Name")
class College(models.Model):
name = models.CharField(max_length=50, default="Enter College Name")
class CourseBatch(models.Model):
startDate = models.DateField(null = True, blank = True)
endDate = models.DateField(null = True, blank = True)
batchName = models.CharField(max_length=50, default="Enter Batch Name")
course = models.ForeignKey(Course, on_delete=models.CASCADE, related_name="course")
trainer = models.ForeignKey(Trainer, on_delete=models.CASCADE, related_name="trainer")
college = models.ForeignKey(College, on_delete=models.CASCADE, related_name="college")
class CheckPoints(models.Model):
description = models.CharField(max_length=50, default="Enter Description")
chkPoint = models.BooleanField(default=False)
course = models.ForeignKey(Course, on_delete=models.CASCADE, related_name="course")
class ChkListForBatch(models.Model):
batch = models.ForeignKey(CourseBatch, on_delete=models.CASCADE, related_name="coursebatch")
chkpoint = models.ForeignKey(CheckPoints, on_delete=models.CASCADE, related_name="chkpoint")
Here every CourseBatch needs to have its own set of CheckPoints (topics) to be covered. How can I implement the same?

Answer 1

As i understand it, you have a list of checkpoints to each cource. And you want to choose, which checkpoints will be for each particular batch.
Updated. If you want to save the completed control point or not, do this:
class Course(models.Model):
name = models.CharField(max_length=50, default="Enter Course Name")
class Trainer(models.Model):
name = models.CharField(max_length=50, default="Enter Trainer Name")
class College(models.Model):
name = models.CharField(max_length=50, default="Enter College Name")
class CourseBatch(models.Model):
startDate = models.DateField(null = True, blank = True)
endDate = models.DateField(null = True, blank = True)
batchName = models.CharField(max_length=50, default="Enter Batch Name")
course = models.ForeignKey(Course, on_delete=models.CASCADE, related_name="course")
trainer = models.ForeignKey(Trainer, on_delete=models.CASCADE, related_name="trainer")
college = models.ForeignKey(College, on_delete=models.CASCADE, related_name="college")
class CheckPoints(models.Model):
description = models.CharField(max_length=50, default="Enter Description")
course = models.ForeignKey(Course, on_delete=models.CASCADE, related_name="course")
class ChkListForBatch(models.Model):
batch = models.ForeignKey(CourseBatch, on_delete=models.CASCADE, related_name="coursebatch")
checkpoint = models.ForeignKey(CheckPoints, on_delete=models.CASCADE, related_name="chkpoint")
checkpoint_is_done = models.BooleanField(default=False)

Answer 2

class Course(models.Model):
name = models.CharField(max_length=50, default="Enter Course Name")
class Trainer(models.Model):
name = models.CharField(max_length=50, default="Enter Trainer Name")
class College(models.Model):
name = models.CharField(max_length=50, default="Enter College Name")
class CourseBatch(models.Model):
startDate = models.DateField(null = True, blank = True)
endDate = models.DateField(null = True, blank = True)
batchName = models.CharField(max_length=50, default="Enter Batch Name")
course = models.ForeignKey(Course, on_delete=models.CASCADE, related_name="course")
trainer = models.ForeignKey(Trainer, on_delete=models.CASCADE, related_name="trainer")
college = models.ForeignKey(College, on_delete=models.CASCADE, related_name="college")
class CheckPoints(models.Model):
description = models.CharField(max_length=50, default="Enter Description")
chkPoint = models.BooleanField(default=False)
course = models.ForeignKey(Course, on_delete=models.CASCADE, related_name="course")
course_batch = models.ForeignKey(to=CourseBatch, on_delete=models.CASCADE) # This means that you have multiple checkpoints associated with single coursebatch.
course_batch_m2m = models.ManyToManyField(to=CourseBatch) # This will create intermediate model, with columns checkpoints_id | coursebatch_id. This means multiple checkpoints has multiple coursebatch and vice-versa.
class ChkListForBatch(models.Model):
batch = models.ForeignKey(CourseBatch, on_delete=models.CASCADE, related_name="coursebatch")
chkpoint = models.ForeignKey(CheckPoints, on_delete=models.CASCADE, related_name="chkpoint")
Check CheckPoints model, I added ForeignKey and ManyToManyField with explanaitans.