108 lines
4.1 KiB
Python
108 lines
4.1 KiB
Python
from django.db import models
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# Represents an authenticated reviewer or reader of reviews.
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class User(models.Model):
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# A non-unique name for the user.
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name = models.CharField(max_length=64)
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# The user's birth date.
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birth_date = models.DateField()
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# Returns the name as the string representation of the user.
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def __str__(self):
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return self.name
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# Represents any object for which reviews can be made. (Universities, Professors, etc.)
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class RateableEntity(models.Model):
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# Constants defined for types of rateable entities.
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UNIVERSITY = 0
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COURSE = 1
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PROFESSOR = 2
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TYPE_CHOICES = (
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(UNIVERSITY, 'University'),
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(COURSE, 'Course'),
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(PROFESSOR, 'Professor')
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)
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# The human-readable name of this entity.
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name = models.CharField(max_length=256)
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# The date and time at which this entity was created.
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created_date = models.DateTimeField(auto_now_add=True)
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# The type of entity this is.
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entity_type = models.SmallIntegerField(choices=TYPE_CHOICES)
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# Gets the average of all the reviews.
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def getAverageRating(self):
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reviews = self.review_set.select_related()
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rating_sum = 0
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for review in reviews:
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rating_sum += review.rating
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if reviews.count() == 0:
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return None
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return rating_sum / reviews.count()
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# Simply returns the name as the string representation.
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def __str__(self):
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return self.name
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# A review represents any single data entry to the database.
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class Review(models.Model):
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# An integer rating in the domain [1, 5]
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rating = models.IntegerField(default=1)
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# A title for the review (brief summary of sentiment)
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title = models.CharField(max_length=128)
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# The textual content of the review.
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content = models.TextField()
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# A foreign key referencing the entity for which this review was made.
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rateable_entity = models.ForeignKey('postings.RateableEntity', on_delete=models.CASCADE)
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# The date and time at which this review was published.
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created_date = models.DateTimeField(auto_now_add=True)
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# The date and time at which the last modification to this review was published.
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last_updated_date = models.DateTimeField(auto_now=True)
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# A reference to the person who created this review.
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author = models.ForeignKey('postings.User', on_delete=models.PROTECT, null=True, blank=True)
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# Gets the total number of votes which marked this review as 'helpful'.
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def getHelpfulVoteCount(self):
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ReviewHelpfulVote.objects.filter(pk=self.pk, helpful=True).count()
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# Gets the total number of votes which marked this review as 'unhelpful'.
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def getUnhelpfulVoteCount(self):
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ReviewHelpfulVote.objects.filter(pk=self.pk, helpful=False).count()
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# A vote for a review as either positive or negative.
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class ReviewHelpfulVote(models.Model):
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# A reference to the review that this vote is for.
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review = models.ForeignKey('postings.Review', on_delete=models.CASCADE)
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# Whether or not the referenced review was helpful.
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helpful = models.BooleanField()
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# The user who made this vote.
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user = models.ForeignKey('postings.User', on_delete=models.CASCADE)
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# A RateableEntity for universities.
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class University(RateableEntity):
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# A string referring to the URL of the university. Every single university should have one.
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website_url = models.URLField()
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# A string referring to the location of the university.
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location = models.CharField(max_length=256)
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# A RateableEntity for professors, who belong to one or more university.
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class Professor(RateableEntity):
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# The universities that this professor teaches or has taught at.
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universities = models.ManyToManyField('postings.University')
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# A RateableEntity for courses, which belong to a university, and have one or more professors.
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class Course(RateableEntity):
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# The university that this course belongs to.
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taught_at_university = models.ForeignKey('postings.University', on_delete=models.CASCADE)
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# A list of professors that teach this course.
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professors = models.ManyToManyField('postings.Professor')
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# Create your models here.
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class UniversityReview(models.Model):
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university_name = models.CharField(max_length=200)
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username = models.CharField(max_length=200)
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rating = models.IntegerField(default=1)
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title = models.CharField(max_length=200)
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date_published = models.DateTimeField(auto_now_add=True)
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content = models.CharField(max_length=200)
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