How to access manytomany field content

[Alagiri Rajesh]

Hi I am using the "Django Category" app (https://github.com/praekelt/django-category)

I have installed the same and also have implemented the same. How do i access the category title and other details. Have tried to use the documentation but using "Category.title" shows up blank.

Also have tried multiple combinations but it does not work.

[Андрей Сердюк]

Hi, if Your code looks like this:

class Category(models.Model):
name = models.CharField(maxlength=32)
pass

class Goods(models.Model):
categories = models.ManyToManyField(Category, on_delete=models.CASCADE)

You would get it with this code:
category = Category.objects.get(pk=23)
goods = category.goods_set.all()
- it returns queryset of instances, which depends on category with pk=23.
Or like that:
item = Goods.objects.get(pk=1)
categories = item.categories.

[Alagiri Rajesh]

Hi @Андрей Сердюк,

Thank you for quick response.

Some clarifications please?

So you are saying that i need to create a new class for the category? the current code for one of my app where i am using category field is as below:

class Listing(models.Model):
    user            = models.ForeignKey(User, default=1, null=True, on_delete=models.SET_NULL)
    title           = models.CharField(max_length=120)
    description     = models.TextField()
    phone_number    = PhoneNumberField(blank=True, null=True)
    fax_number      = PhoneNumberField(blank=True, null=True)
null=True)
    address1        = models.ForeignKey(Address, on_delete=models.CASCADE, related_name='addresses', blank=False, null=False)
    address2        = AddressField(related_name='Address', on_delete=models.CASCADE, blank=False, null=False)
    created_date    = models.DateTimeField(auto_now=False, auto_now_add=True, null=False, blank=True)
    updated         = models.DateTimeField(auto_now=True)
    timestamp       = models.DateTimeField(auto_now_add=True)
    # category        = models.ForeignKey(category, 'category.Category', help_text='Categorize this item.')
    categories      = models.ManyToManyField('category.Category', help_text='Categorize this item.')
    tags            = models.ManyToManyField('category.Tag', help_text='Tag this item.')
    slug            = AutoSlugField(populate_from='title', unique=True, null=False, blank=False)

I do not have a class for Category. I assumed that the django-category app would have it?

Also if i am to retrieve individual or multiple categories / tags related to the listing, how do i show the field in the form and also on the frontend?

Have currently tried to use "{{ Listing.Category.slug }}" / "{{ Listing.Category.title }}" these does not show up on the front end. It shows up blank. screen shot below.

Please advice.

[Андрей Сердюк]

So You should to show Your template first and use ModelForm to inherit it with model You need in meta options.