backend/postings/models.py

@@ -1,8 +1,41 @@
 from django.db import models
 
+# Represents any object for which reviews can be made. (Universities, Professors, etc.)
+class RateableEntity(models.Model):
+	# The human-readable name of this entity.
+	name = models.CharField(max_length=256)
+
+	class Meta:
+		abstract = True
+
+# A review represents any single data entry to the database.
 class Review(models.Model):
-	# An integer rating which defines
+	# An integer rating in the domain [1, 5]
 	rating = models.IntegerField(default=1)
+	# The textual content of the review.
+	content = models.TextField()
+	# An integer representing the number of times a user found this review helpful.
+	helpful_vote_count = models.IntegerField(default=1)
+	# An integer representing the number of times a user found this review unhelpful.
+	unhelpful_vote_count = models.IntegerField(default=1)
+	# A foreign key referencing the entity for which this review was made.
+	rateable_entity_id = models.ForeignKey(RateableEntity, on_delete=models.CASCADE)
+
+# A RateableEntity for universities.
+class University(RateableEntity):
+	pass
+
+# A RateableEntity for professors, who belong to one or more university.
+class Professor(RateableEntity):
+	# The universities that this professor teaches or has taught at.
+	university = models.ManyToManyField(University)
+
+# A RateableEntity for courses, which belong to a university, and have one or more professors.
+class Course(RateableEntity):
+	# The university that this course belongs to.
+	university = models.ForeignKey(University, on_delete=models.CASCADE)
+	# A list of professors that teach this course.
+	professors = models.ManyToManyField(RateableEntity)
 
 # Create your models here.
 class UniversityReview(models.Model):