How do i call a primary key from another view in another form in django? - django-models

Question

I have a stocks model that relies on GRN (Goods Receiving Note) model primary key in order to store stocks of a certain GRN in the database. I would like to humbly ask for guidance on how i can click a GRN and enter stocks in a form with the open GRN No already selected in this form.
Below are my views:
def grns(request):
grns = GRN.objects.all()
return render (request, 'products/GRNS.html', {'grns' : grns})
def grn(request, pk):
gnrObj = GRN.objects.get(GRN_id = pk)
return render(request, 'products/stocks_in.html', {'grn': gnrObj})
def createGrn(request):
form = GrnForm()
if request.method == 'POST':
form = GrnForm(request.POST)
if form.is_valid():
form.save()
return redirect('grns')
context = {'form': form}
return render (request, 'products/grn_form.html', context)
def stocks(request):
stocks = Stock.objects.all()
return render (request, 'products/stocks_in.html', {'stocks' : stocks})
def stock(request, pk):
stockObj = stock.objects.get(GRN_id = pk)
return render(request, 'products/stocks_in_form.html', {'stock': stockObj})
def createStock(request):
form = StockForm()
if request.method == 'POST':
form = StockForm(request.POST)
if form.is_valid():
form.save()
return redirect('stocks')
context = {'form': form}
return render (request, 'products/stocks_in_form.html', context)
Below are my urls:
#GRNS Urls
path('grns', views.grns, name = "grns"),
path('create-grn/', views.createGrn, name = "create-grn"),
path('grn/<str:pk>/', views.grn, name = "grn"),
#Stocks Urls
path('stocks', views.stocks, name = "stocks"),
path('create-stock/', views.createStock, name = "create-stock"),
path('stock/<str:pk>/', views.stock, name = "stock"),
Below are my forms:
class GrnForm(ModelForm):
class Meta:
model = GRN
fields = ['GRN_no', 'date', 'supplier']
def __init__(self, *args, **kwargs):
super(GrnForm, self).__init__(*args, **kwargs)
self.fields['GRN_no'].widget.attrs.update(
{'class': 'form-control'}
)
self.fields['date'].widget.attrs.update(
{'class': 'form-control', 'type': 'date'}
)
self.fields['supplier'].widget.attrs.update(
{'class': 'form-control'}
)
class StockForm(ModelForm):
class Meta:
model = Stock
fields = ['GRN', 'product', 'warehouse', 'unit_price', 'quantity']
def __init__(self, *args, **kwargs):
super(StockForm, self).__init__(*args, **kwargs)
self.fields['GRN'].widget.attrs.update(
{'class': 'form-control', 'value':'grn.GRN_id'}
)
self.fields['product'].widget.attrs.update(
{'class': 'form-control'}
)
self.fields['warehouse'].widget.attrs.update(
{'class': 'form-control'}
)
self.fields['unit_price'].widget.attrs.update(
{'class': 'form-control'}
)
self.fields['quantity'].widget.attrs.update(
{'class': 'form-control'}
)