# Get value from url in detail view

**URL:** <https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403>\
**Category:** Using Django\
**Created:** [January 6, 2022, 8:25am UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403 "2022-01-06T08:25:48Z")\
**Posts on this page:** 9\
**Page:** 1

<div class="post-metadata">

**Author:** ![himanshu](https://avatars.discourse-cdn.com/v4/letter/h/ac91a4/32.png) [@himanshu](https://forum.djangoproject.com/u/himanshu)\
**Post date:** [January 6, 2022, 8:25am UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/1 "2022-01-06T08:25:48Z")

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Hi, anyone can help me with this. I want to use category value fetched from urls in the model of this DetailView class.

> views.py
> 
> class ProductDetailView(DetailView):  
> model = category

> urls.py
> 
> path(‘productdetail/str:category/slug:slug/’, views.ProductDetailView.as\_view(), name=‘product-detail’),

---

<div class="post-metadata">

**Author:** ![KenWhitesell](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.djangoproject.com/kenwhitesell/32/280_2.png) [@KenWhitesell](https://forum.djangoproject.com/u/KenWhitesell)\
**Post date:** [January 6, 2022, 1:30pm UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/2 "2022-01-06T13:30:44Z")

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Use how?

See the docs at [Built-in class-based generic views | Django documentation | Django](https://docs.djangoproject.com/en/4.0/topics/class-based-views/generic-display/#built-in-class-based-generic-views), particularly the section [Dynamic filtering](https://docs.djangoproject.com/en/4.0/topics/class-based-views/generic-display/#dynamic-filtering)

Side note - when posting single lines of code, enclose the line with backtick - ` characters. If it’s multiple lines, surround the block of code with lines of three backtick - ` characters. You’ll have a line of ```, then the code, then another line of ```.

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<div class="post-metadata">

**Author:** ![himanshu](https://avatars.discourse-cdn.com/v4/letter/h/ac91a4/32.png) [@himanshu](https://forum.djangoproject.com/u/himanshu)\
**Post date:** [January 12, 2022, 11:30am UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/3 "2022-01-12T11:30:54Z")

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Thanks, I got the solution for this but I am stuck at this now.  
I want to access the models.Fashion accessed Dynamically from ‘cat’ selected value. can you help me with this to get model attribute value dynamically.

```auto
form.py
class AddProductForm(forms.ModelForm):
    cat = models.Category.objects.all()
    cat_choice = []
    for item in cat:
        val = (item.category, item.category_name)
        cat_choice.append(val)

    cat = forms.ChoiceField(choices=cat_choice, label="Select Category", widget=forms.Select(attrs={'class':'form-control'}))

    class Meta:
        model = models.Fashion
        fields = " __all__"
        exclude = ("slug", "seller_name")

```

```auto
views.py
class SellerUpload(CreateView):
    form_class = AddProductForm
    template_name = 'seller/seller_upload.html'
    success_url = "/thankyou"

```

---

<div class="post-metadata">

**Author:** ![KenWhitesell](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.djangoproject.com/kenwhitesell/32/280_2.png) [@KenWhitesell](https://forum.djangoproject.com/u/KenWhitesell)\
**Post date:** [January 12, 2022, 12:15pm UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/4 "2022-01-12T12:15:57Z")

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I’m sorry, I’m not understanding what you’re trying to do here. Can you be a little more specific about what you’re trying to achieve?

Also, your method of building `cat_choice` at the class level isn’t the best way to do this. Your better off making that a function in the class and referencing the function in the field. See [Form fields | Django documentation | Django](https://docs.djangoproject.com/en/4.0/ref/forms/fields/#django.forms.ChoiceField)  
(Also, that block of code can be replaced by:  
`cat_choice = Category.objects.all().values_list('category', 'category_name')`  
See [QuerySet API reference | Django documentation | Django](https://docs.djangoproject.com/en/4.0/ref/models/querysets/#values-list))

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<div class="post-metadata">

**Author:** ![himanshu](https://avatars.discourse-cdn.com/v4/letter/h/ac91a4/32.png) [@himanshu](https://forum.djangoproject.com/u/himanshu)\
**Post date:** [January 12, 2022, 1:05pm UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/5 "2022-01-12T13:05:29Z")

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> [@KenWhitesell](#):
>
> ‘category’, ‘category\_name’

Ok, In cat\_choice i have these values

> [(‘Electronic’, ‘Electronics’), (‘Fashion’, ‘Fashion’), (‘HomeDecor’, ‘Home Decor’), (‘Mobile’, ‘Mobiles’)]

which are also my table names in models.py like class Electronic, class Fashion and so on and every class in that list have same fields so with only one form I want to add these products to different classes selected dynamically from cat\_choice.

so in class Meta the model attribute would get the class name of that particular table dynamically from the drop down of cat\_choice value and add object to that particular table.

also thank you for this, I tried and it’s working.

> cat\_choice = Category.objects.all().values\_list(‘category’, ‘category\_name’)

---

<div class="post-metadata">

**Author:** ![KenWhitesell](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.djangoproject.com/kenwhitesell/32/280_2.png) [@KenWhitesell](https://forum.djangoproject.com/u/KenWhitesell)\
**Post date:** [January 12, 2022, 1:11pm UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/6 "2022-01-12T13:11:57Z")

</div>

You can do it in one form, but it’s not going to be a Model form. An instance of a ModelForm is created from a Model - and that decision is made before any submitted data is available.

You would need to create a regular (not-model) form, and then decide during your post handling which type of Model to create and save.

(Although, I find myself questioning why you would have 4 different tables all with exactly the same fields. My initial gut-reaction to that statement is that there’s a better way of handling that situation.)

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<div class="post-metadata">

**Author:** ![himanshu](https://avatars.discourse-cdn.com/v4/letter/h/ac91a4/32.png) [@himanshu](https://forum.djangoproject.com/u/himanshu)\
**Post date:** [January 12, 2022, 1:44pm UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/7 "2022-01-12T13:44:20Z")

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Okay, Also answer to this

> (Although, I find myself questioning why you would have 4 different tables all with exactly the same fields. My initial gut-reaction to that statement is that there’s a better way of handling that situation.)

I know that I can create a single class say Products and in this I could have give the field named category and with that I can filter out my desired results but I am exploring django and doing this simple tasks with more complex problems like different tables with same field and adding data in those tables dynamically, etc.

```auto
class ProductDetilView(DetailView):
    template_name = 'ecommerce/product-detail.html'
    context_object_name = 'product'

    def get_queryset(self):
         model = self.kwargs['category']
         return getattr(models, model).objects.all()

```

As you can see in this class I have fetched data from the different tables with category and this category is fetched from urlconfs and trying to do more such weirdo things so that i could learn more different approaches.

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<div class="post-metadata">

**Author:** ![KenWhitesell](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.djangoproject.com/kenwhitesell/32/280_2.png) [@KenWhitesell](https://forum.djangoproject.com/u/KenWhitesell)\
**Post date:** [January 12, 2022, 1:55pm UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/8 "2022-01-12T13:55:41Z")

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Cool! That’s always a worthwhile endeavor.

And if that’s the case, I might have one or two really off-the-wall ideas that I would never recommend someone actually use - but could do what you’re looking for. Let me think about that for a bit.

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<div class="post-metadata">

**Author:** ![KenWhitesell](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.djangoproject.com/kenwhitesell/32/280_2.png) [@KenWhitesell](https://forum.djangoproject.com/u/KenWhitesell)\
**Post date:** [January 12, 2022, 8:27pm UTC](https://forum.djangoproject.com/t/get-value-from-url-in-detail-view/11403/9 "2022-01-12T20:27:31Z")

</div>

Ok, so given the docs I found at [Creating forms from models | Django documentation | Django](https://docs.djangoproject.com/en/4.0/topics/forms/modelforms/#modelform-factory-function) and [Model Form Functions | Django documentation | Django](https://docs.djangoproject.com/en/4.0/ref/forms/models/#modelform-factory), I’m not too far off-the-wall.

Again, this isn’t something I would generally recommend in the routine case, but it is available.

Assume an app named my\_app, with the models you’ve specified earlier as identified by “category” being passed in as a kwarg to the view, you can dynamically create a model form using the modelform\_factory function:

```auto
import my_app
from django.forms import modelform_factory

form_class = getattr(my_app.models, self.kwargs['category']), # Get the reference to the class

excludes = ('slug', 'seller_name') # Taken from your first example in the OP

MyNewModelForm = modelform_factory(form_class, exclude=excludes)

new_form = MyNewModelForm() # Create the instance of the form

```

Note that that last line works as if you’re creating an instance of _any_ ModelForm with all the appropriate parameters available, including things like `request.POST` or `instance`.