How do I iterate ManyToMany field in Django template tag?-CodePudding

So I have an object that contains a Many-to-Many field. I'm trying to iterate this field in Django template, but apparently I can't. Let me show you the code first.
model

class Book(models.Model):
    title = models.CharField(max_length = 100, blank=True)
    category = models.ManyToManyField(Category)

    def __str__(self):
        return self.title

views.py

def book_list(request):
    books = Book.objects.all().order_by('-pk')
        
    context = {
        'books' : books,
    }
    return render(request, 'contents/book_list.html', context)

Now template.

{% for b in books %}
<div>
    {{b.title}}
    {% for cat in b.category %}
    {{cat}}
    {% endfor %}
</div>
{% endfor %}

Now I get 'ManyRelatedManager' object is not iterable error. How do I iterate the field and show all the category in each object? Thanks.

CodePudding user response：

It's because if you call b.category it returns only the relation object. To get its values (category objects) you have to add .all. Like this:

{% for b in books %}
<div>
    {{ b.title }}
    {% for cat in b.category.all %}
        {{cat}}
    {% endfor %}
</div>
{% endfor %}

btw. I've also changed c.title to b.title, because I assume you want this book title, not something from global :)