Django: Access the single model object passed into DetailView for manipulation of its attributes' values

Question

I am trying to access the object used in Django DetailView and used to display Model data.

I can access the object in the html template, by {{ object.product_name }} .

But, how do I access the object in a function, like below? (within views.py) .

def access_object_values(self):
      name = object.product_name   

(my attempts fail and I get: WSGIRequest' object has no attribute)

. .

My setup:

*models.py*

    class Product(models.Model):
          product_name = models.Charfield(max_length=20)
          product_price = models.FloatField(max_length=12, default=100)

*urls.py*

    path('product/<int:pk>/', ProductView.as_view(), name='product-detail)

My attempts:

class ProductView(DetailView):
    model = Product
    template_name = 'product/product_detail.html'

    def get_object(self, queryset=None):
        if queryset is None:
            queryset = self.get_queryset()
        obj = super(ProductView, self).get_object(queryset=queryset)
        return obj

    def get(self, obj, *args, **kwargs):
        return self.generate_pdf(obj)


    # TO VISUALLY GET FEEDBACK OF SUCCESS OR NOT
    # ==========================================
    def generate_pdf(self, obj):
        from reportlab.pdfgen import canvas
        response = HttpResponse(content_type='application/pdf')
        response['pdf'] = 'attachment; filename="summary.pdf"'
        p = canvas.Canvas(response)
        # name = getattr(obj, 'product_name') # produces 'WSGIRequest' object has no attribute 'product_name'
        # name = obj.product_name             # produces 'WSGIRequest' object has no attribute 'product_name'
        # name = type(obj)                    # produces 'WSGIRequest' has no attribute 'decode
        name = "text"                         # this works, and it prints
        p.drawString(100, 100, name)
        p.showPage()
        p.save()
        print(p)
        return response

Answer 1

A method get_object should return an object. Try:

def get_object(self, queryset=None):
    obj = super(ProductView, self).get_object(queryset=queryset)
    self.generate_pdf(obj)
    return obj

def generate_pdf(self, obj):
    from reportlab.pdfgen import canvas
    p = canvas.Canvas(response)
    name = obj.product_name
    p.drawString(100, 100, name )
    p.showPage()
    p.save()
    print(p)

If you want just to print it, no need for response here.

Answer 2

def get_object(self, queryset=None):
   if queryset is None:
       queryset = self.get_queryset()
   obj = super(ProductView, self).get_object(queryset=queryset)
    self.generate_pdf(obj)
    return obj

def generate_pdf(self, obj):
    from reportlab.pdfgen import canvas
    p = canvas.Canvas(response)
    name = obj.product_name
    p.drawString(100, 100, name )
    p.showPage()
    p.save()
    print(p)

This could be what you are looking for

Answer 3

A useful answer, if one wants to access context and use it as variables: Accessing global variable in view using context processor in Django

Add your context processor method path (folder.context_processor.application_context) to TEMPLATE_CONTEXT_PROCESSORS.

in my case application_context is the method which i defined inside file context_processor.py and method "application_context" returns {'titles': 'mytitle'}

if you want to use "title" as global variable in views use it in this way

 global_var = RequestContext(request).get("app_config") titles = global_var.get("titles") print titles 

Another useful answer is here: Django: How to provide context to all views (not templates)?