Since the related name in the project foreign key is "review" you have to
use that keyword for the related query from project, so it should be
"self.review.all()" instead of "self.review_set.all()" in your Project
methods.
Regards!
On Fri, Oct 12, 2018 at 9:25 AM Melissa Malala <melissamal...@gmail.com>
wrote:
> Getting an error that says "Project object has no attribute review_set"
> when trying to get the mean of ratings using Numpy. HTML looks something
> like this, what could be the problem? Please have a look below and let us
> know what you think:
>
>
> <h5>{{ project.review.count }} reviews ({{
> project.average_design | floatformat }} average rating of design)</h5><h5>{{
> project.review.count }} reviews ({{
> project.average_content | floatformat }} average rating of
> content)</h5><h5>{{ project.review.count }} reviews ({{
> project.average_usability | floatformat }} average rating of
> usability)</h5>class Project(models.Model):
> title = models.TextField(max_length=200, null=True, blank=True,
> default="title")
> project_image = models.ImageField(upload_to='picture/', null=True, blank=True)
> description = models.TextField()
> project_url=models.URLField(max_length=250)def average_design(self):
> design_ratings = list(map(lambda x: x.design_rating,
> self.review_set.all()))
> return np.mean(design_ratings)
> def average_usability(self):
> usability_ratings = list(map(lambda x: x.usability_rating,
> self.review_set.all()))
> return np.mean(usability_ratings)
> def average_content(self):
> content_ratings = list(map(lambda x: x.content_rating,
> self.review_set.all()))
> return np.mean(content_ratings)
>
> class Review(models.Model):
> RATING_CHOICES = (
> (1, '1'),
> (2, '2'),
> (3, '3'),
> (4, '4'),
> (5, '5'),
> (6, '6'),
> (7, '7'),
> (8, '8'),
> (9, '9'),
> (10, '10'),
> )
> project = models.ForeignKey(Project, null=True, blank=True,
> on_delete=models.CASCADE, related_name="review")
> user = models.ForeignKey(User, null=True, blank=True,
> on_delete=models.CASCADE, related_name='user')
> image = models.ForeignKey(Image, on_delete=models.CASCADE,
> related_name="project", null=True, blank=True)
> comment = models.TextField()
> design_rating = models.IntegerField(choices=RATING_CHOICES,
>
>
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