need help designing models

Consider a university college.

1. College has name, uid, website

2. Each college has a many departments - Each department has name, uid.

3. Each batch in a department has name, and ratings.

from django.db import models

class College(models.Model):

name = models.CharField(max_length=200)

uid = models.CharField(max_length=10, primary_key=True)

website = models.URLField()

def __unicode__(self):

return self.name

class Department(models.Model):

name = models.CharField(max_length=200)

uid = models.CharField(max_length=10)

college = models.ForeignKey(College)

def __unicode__(self):

return self.name

class Batch(models.Model):

name = models.IntegerField(max_length=100)

department = models.ForeignKey(Department)

college = models.ForeignKey(College)

rating = models.IntegerField(default=0)

def __unicode__(self):

return self.name

Would you suggest any better design ? (actually, I never formally read DB)

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