Django ForeignKey attribute is not showing up in HTML

Question

I have some models and connected each other. And in my views I get the Chapter model ordered by date published, and then remove the ones with same Manga (foreign key associated with other model).

But apparently accept for the fields is not connected with anything, and I can’t access the models fields. But also because I am working with a query set I can’t sort by id or anything. Also, I have to access the Manga models fields associated with chapter. But it does not show up in the HTML. How can I do it?

My models:

 class Manga(models.Model):
    manga_name = models.CharField(max_length=255, default="null")
    manga_image = models.ImageField(upload_to="thumbnail", default="thumbnail/noimage.png")
    manga_views = models.IntegerField(default=0)

    def __str__(self):
        return f"{self.id}, {self.manga_name}"


class Fansub(models.Model):
    fansub_name = models.CharField(max_length=255, default="null")

    def __str__(self):
        return f"{self.id}, {self.fansub_name}"

class Chapter(models.Model):
    chapter_number = models.IntegerField(default=0)
    chapter_url = models.URLField(default="www.example.com")
    manga = models.ForeignKey(Manga, on_delete=models.CASCADE)
    fansub = models.ForeignKey(Fansub, on_delete=models.CASCADE)
    relase_date = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.chapter_number}, {self.manga}, {self.fansub}"

My view:

def Index(request):
manga = Manga.objects.all()
chapter = Chapter.objects.all().values()
fansub = Fansub.objects.all().values()

mostview = manga.order_by("-manga_views")[:5]

relasedateorder = chapter.order_by("relase_date")

context = {
    "Manga": manga,
    "Chapter": chapter,
    "Fansub": fansub,
    "Mostview": mostview,
    "LastUpdated": relasedateorder,
}

template = loader.get_template("Index.html")

And finally the HTML:

{%for d in LastUpdated%}
    <p>{{d.manga}}</p>
{%endfor%}

Asked By: PlatinMavi

||

Source

Answer 1

In your view, you’re using the values method on the Chapter queryset, which returns a queryset of dictionaries instead of Chapter objects. To access the associated Manga object, you need to change your view to return a queryset of Chapter objects like this:

def Index(request):
    manga = Manga.objects.all()
    chapter = Chapter.objects.all().order_by("relase_date")[:50]
    fansub = Fansub.objects.all().values()

    mostview = manga.order_by("-manga_views")[:5]

    chapter_without_duplicates = list(set([c.manga for c in chapter]))

    context= {
        "Manga": manga,
        "Chapter": chapter_without_duplicates,
        "Fansub": fansub,
        "Mostview": mostview,
    }

    template = loader.get_template("Index.html")

Template file:

    {% for manga in Chapter %}
        <p>{{manga.manga_name}}</p>
        <p>{{manga.manga_image.url}}</p>
        <p>{{manga.manga_views}}</p>
    {% endfor %}

Answered By: Nikhil Kotiya

Answer 2

You can access the all the instances of Manga model associated with chapter instance by using _set as suffix in the following way:

{% for i in LastUpdated %}
    <p>{{i.chapter_number}}</p>
    <h2> manga model attributes below</h2>
    {% for j in i.manga_set.all %}
        {{j.manga_name}}
        {{j.manga_views}}
    {% endfor %}    
{% endfor %}

Also you should use Chapter.objects.all().order_by("relase_date") this queryset as using .values() gives you a key-value pair (dict).

Answered By: Sunderam Dubey

Django ForeignKey attribute is not showing up in HTML

Question:

Answers:

Template file: