Develop Reference

Passing data from a form to a view Django

I have two functions in views.py, the first one allows you to display information from tables. The second is to get data from the form and redirect to the page with the result. How can I pass the data received from the form to the first function to display information from the tables based on this very data?
In the first function:
def SuOp(request):
allrooms = Rooms.objects.all()
allfood = Food.objects.all()
alltours = Tours.objects.all()
data = {
'allfood': allfood,
'allrooms': allrooms,
'alltours': alltours,
}
return render(request, './obj.html', data)
in the second function:
def Main(request):
error = ''
if request.method == 'POST':
form = SearchMain(request.POST)
if form.is_valid():
budget = form.cleaned_data.get("budget")
arrival_date = form.cleaned_data.get("arrival_date")
departure_date = form.cleaned_data.get("departure_date")
number_of_people = form.cleaned_data.get("number_of_people")
count_days = (departure_date-arrival_date).days
return redirect('allobject')
else:
error = 'The form has been filled out incorrectly'
form SearchMain()
data = {
'formS': form,
'error': error,
}
return render(request, './main.html', data)
urls.py:
urlpatterns = [
path('', views.Main, name='main'),
path(r'allobject/$', views.SuOp, name='allobject')
]

You can use sessions to pass values from one view to another. First set the session:
if form.is_valid():
budget = form.cleaned_data.get("budget")
request.session['budget'] = budget
...
return redirect('allobject')
Then your other view can get the session variable:
def SuOp(request):
budget = request.session.get('budget')
...
allrooms = Rooms.objects.all()
allfood = Food.objects.all()
alltours = Tours.objects.all()
data = {
'allfood': allfood,
'allrooms': allrooms,
'alltours': alltours,
}
return render(request, './obj.html', data)
The other option is to do all the calculations in the view that receives the budget, arrival_date, departure_date, number_of_people, save the desired results to the Rooms, Food and Tours objects.

How Can I sum the Result of a Django Date Range Result in Views

I want to add all the amount field during a date range query search. I have an Income Model with date and amount fields among others. And any time a user select between two dates, I want the amount fields of the query results added as total.
Here is what I have tried:
def SearchIncomeRange(request):
listIncome = Income.objects.all()
searchForm = IncomeSearchForm(request.POST or None)
if request.method == 'POST':
listIncome = Income.objects.filter(
description__icontains=searchForm['description'].value(),
date__range=[
searchForm['start_date'].value(),
searchForm['end_date'].value()
]
)
else:
searchForm = IncomeSearchForm()
paginator = Paginator(listIncome, 5)
page = request.GET.get('page')
paged_income = paginator.get_page(page)
context = {
'searchForm':searchForm,
}
return render(request, 'cashier/search_income_range.html', context)
I am able to get the correct search result but getting the total I don't know how to use the SUM in the above query and pass the total in pagination. So Someone should please help me out. Thanks

from django.db.models import Sum
total_amount = listIncome.aggregate(total=Sum('amount'))
where listIncome is your queryset
Edit:
You should pass queryset in pagination with filtered queryset if any filter you apply.
I changed your written code but you can write this code in a good way.
def SearchIncomeRange(request):
listIncome = Income.objects.all()
searchForm = IncomeSearchForm(request.POST or None)
if request.method == 'POST':
# you can get filter value by your form data
post_data = request.POST
description = post_data['description']
start_date = post_data['start_date']
end_date = post_data['end_date']
else:
# you can get filter value by your query params
query_params = request.GET
description = query_params.get('description')
start_date = query_params.get('start_date')
end_date = query_params.get('end_date')
# Apply filter before pagination
listIncome = listIncome.filter(
description__icontains=description,
date__range=[start_date, end_date]
)
# calculate total_amount
total_amount = listIncome.aggregate(total=Sum('amount'))
paginator = Paginator(listIncome, 5)
page = request.GET.get('page')
paged_income = paginator.get_page(page)
# you can access total_amount in template by passing in context data
context = {
'searchForm':searchForm,
'total_amount': total_amount
}
return render(request, 'cashier/search_income_range.html', context)

Django : view calls an other template (Pagination )

I have this view:
class DamageListCriteria(TemplateView):
template_name = "damage/damagelist_criteria.html"
def get(self, request):
form = DamageListCriteriaForm()
general = General.objects.get(pk=1)
args = {
'form': form,
'general': general
}
return render(request, self.template_name, args)
def post(self, request):
general = General.objects.get(pk=1)
form = DamageListCriteriaForm(request.POST)
form.non_field_errors()
if form.is_valid():
fromdate = request.POST.get('fromdate')
fdate = datetime.strptime(fromdate, '%d/%m/%Y')
fdate = datetime.combine(fdate, datetime.min.time(), tzinfo=pytz.UTC)
print('fdate ', fdate)
todate = form.cleaned_data['todate']
#tdate = datetime.strptime(todate, '%d/%m/%Y') + timedelta(days=1)
tdate = datetime.strptime(todate, '%d/%m/%Y')
tdate = datetime.combine(tdate, datetime.max.time(), tzinfo=pytz.UTC)
print('tdate ', tdate)
d_list = Damage.objects.filter(entry_date__range=(fdate, tdate))
paginator = Paginator(d_list, 1)
page = request.GET.get('page')
try:
damage_list = paginator.page(page)
except PageNotAnInteger:
# If page is not an integer, deliver first page.
damage_list = paginator.page(1)
except EmptyPage:
# If page is out of range (e.g. 9999), deliver last page of results.
damage_list = paginator.page(paginator.num_pages)
template = "damage/damagelist_table.html"
form = DamageListForm()
general = General.objects.get(pk=1)
fromdatetext = fdate.strftime('%d/%m/%Y')
todatetext = tdate.strftime('%d/%m/%Y')
args = {
'form': form,
'damage_list': damage_list,
'general': general,
'fromdate': fromdatetext,
'todate': todatetext
}
return render(request, template, args)
else:
print('form is not valid')
print(form.errors)
# form = DamageEntryForm()
args = {'form': form,
'general': general
}
return render(request, self.template_name, args)
I want to get some criteria to make a filtering listing of my database.
It worked this way , until the moment i tried to add pagination.
The url is http://127.0.0.1:8000/damage/damage/list/criteria/
url(r'damage/list/criteria/$', views.DamageListCriteria.as_view(), name="damage-list-criteria"),
Next and Previous don't work because I am still at this url after the
return render(request, template, args)
Can i redirect somehow?
I understand that this might be the wrong way to do the listing. Can you help me , how to do it?
Thanks a lot
Kostas

The easiest thing to do would be not use Django itself but use Django REST framework and reuse its serializer classes along with APIView (or one of its subclasses). Are you in a position to use it or are you constrained?

How to paginate search results in Django?

The code below searches for the word in dictionary, and render results on search.html, so I need to paginate results on that page, how can I do that? I read the arcticle here https://docs.djangoproject.com/en/1.9/topics/pagination/, but I have no idea how to embed the pagination code to mine.
def search(request):
if 'results' in request.GET and request.GET['results']:
results = request.GET['results']
word = words.objects.filter(title__icontains = results).order_by('title')
return render_to_response('myapp/search.html',
{'word': word, 'query': results })
else:
return render(request, 'myapp/search.html')

from django.core.paginator import Paginator
def search(request):
if 'results' in request.GET and request.GET['results']:
page = request.GET.get('page', 1)
results = request.GET['results']
word = words.objects.filter(title__icontains = results).order_by('title')
paginator = Paginator(word, 25) # Show 25 contacts per page
word = paginator.page(page)
return render_to_response('myapp/search.html',
{'word': word, 'query': results })
else:
return render(request, 'myapp/search.html')

I prefer using the ListView Class when i need pagination on a queried data, and overiding the query_set function. Something like this...
class FoodMenuView(generic.ListView):
paginate_by = 10 #use your paginated value here
template_name = 'order/_food_menu.html' # your own template
context_object_name = "list_of_food"
def get_queryset(self):
return Food.objects.filter(price=request.GET['price'])

Filtering data with __range

I'm using django_tables2 thus part of the code is dependent on this package, but this should be irrelevant to the overall problem.
forms.py
class PersonForm(forms.Form):
date_from = forms.DateField(input_formats='%d/%m/%Y')
date_to = forms.DateField(input_formats='%d/%m/%Y')
views.py
def filter(request):
table = PersonTable(Person.objects.all())
if request.method == 'POST':
form = PersonForm(request.POST)
if form.is_valid():
date_from = form.cleaned_data['date_from']
date_to = form.cleaned_data['date_to']
result_filtered = table.filter(date__range=(date_from, date_to))
RequestConfig(request, paginate={"per_page": 100}).configure(table)
return render(request, "people.html", {
"table": result_filtered })
args = {}
args.update(csrf(request))
args['form'] = PersonForm()
args['table'] = table
RequestConfig(request, paginate={"per_page": 100}).configure(table)
return render(request, 'people.html', args)
Simply, filtering is not working. I can see the entire table, but when I try to filter nothing happens. Can you see what's wrong?

I'm pretty sure you need to call .filter() on the query set rather than the table. For example:
result_filtered = PersonTable(Person.objects.filter(date__range=(date_from, date_to))
Also, on this line:
RequestConfig(request, paginate={"per_page": 100}).configure(table)
You are passing in table. You should pass in result_filtered instead.

This is one way I'd do it, assuming your Person model has a date field:
def filter(request):
if 'date_from' in request.GET and 'date_to' in request.GET:
# form data has been submitted
form = PersonForm(request.GET)
if form.is_valid():
date_from = form.cleaned_data['date_from']
date_to = form.cleaned_data['date_to']
people = Person.objects.filter(date__range=(date_from, date_to))
table = PersonTable(people)
else:
table = PersonTable(Person.objects.all())
else:
form = PersonForm()
table = PersonTable(Person.objects.all())
RequestConfig(request, paginate={"per_page": 100}).configure(table)
args = {}
args.update(csrf(request))
args['form'] = form
args['table'] = table
return render(request, 'people.html', args)
This binds the form if both its expected fields are present, and limits the queryset according to the results if valid. If not valid, it renders the bound form and the table built from the unlimited table. If form data was not submitted, it renders the table built from the unlimited table.
Your form tag's method attribute should be GET rather than POST, if using this design.
This doesn't quite follow the usual Django patterns for form handling because the form isn't actually making any changes, so you can use GET and don't need to return a redirect on success.