I have one URL in urls.py file as given below:-
urlpatterns = [
........
path('edit_student/<student_id>', views.edit_student, name="edit_student"),
path('populate_sections', views.populate_sections, name="populate_sections"),
..........
]
In views.py file edit student function is defined as follows:
#login_required
def edit_student(request, student_id):
form = UpdateStudentForm()
context = {
"form": form
}
return render(request, "edit_student.html", context)
Now the template edit_student.html has a Ajax call:-
$("#id_class_name").change(function(){
var class_name = $(this).val();
$.ajax({
url: 'populate_sections',
type: 'GET',
data: {class_name:class_name},
dataType: 'json',
success: (data) => {
$("#id_section_name").empty();
for( var i in data.context){
$("#id_section_name").append("<option value='"+data.context[i].id+"'>"+data.context[i].name+"</option>");
}
}
});
});
The views.py file function populate_section is declared as follows:-
#login_required
def populate_sections(request):
is_ajax = request.headers.get('X-Requested-With') == 'XMLHttpRequest'
if is_ajax:
if request.method == 'GET':
class_name = request.GET.get("class_name")
class_object = Classes.objects.get(id=class_name)
sections = Sections.objects.filter(classes=class_object)
return JsonResponse({'context': list(sections.values())})
return JsonResponse({'status': 'Invalid request'}, status=400)
else:
return HttpResponseBadRequest('Invalid request')
Whenever i change the field which triggers Ajax function call i am getting the value error:
ValueError at /edit_student/populate_sections
Exception Value:
Field 'id' expected a number but got 'populate_sections'.
I understand that it is expecting the student id but how to do that.
Thanks & Regards
Neha Singh
Related
I have managed to write code to add a customer to my MongoDB collection from my Angular service method to my Django http function, as follows:
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json',
'Accept': 'application/json'
}),
withCredentials: false
}
#Injectable()
export class MongoService {
myApiBaseUrl = "http://localhost:8000/mydjangobaselink/";
constructor(private httpClient: HttpClient) { }
addCustomer(customerFormInfo: Customer): Observable<Customer> {
return this.httpClient.post<Customer>(`${this.myApiBaseUrl}`, JSON.stringify(customerData), httpOptions);
}
deleteCustomer(): Observable<Customer> {
return this.httpClient.delete<Customer>(`${this.myApiBaseUrl}`);
}
}
#csrf_exempt
#api_view(['GET', 'POST', 'DELETE'])
def handle_customer(request):
if request.method == 'POST':
try:
customer_data = JSONParser().parse(request)
customer_serializer = CustomerModelSerializer(data=customer_data)
if customer_serializer.is_valid():
customer_serializer.save()
# Write customer data to MongoDB.
collection_name.insert_one(customer_serializer.data)
response = {
'message': "Successfully uploaded a customer with id = %d" % customer_serializer.data.get('id'),
'customers': [customer_serializer.data],
'error': ""
}
return JsonResponse(response, status=status.HTTP_201_CREATED)
else:
error = {
'message': "Can not upload successfully!",
'customers': "[]",
'error': customer_serializer.errors
}
return JsonResponse(error, status=status.HTTP_400_BAD_REQUEST)
except:
exceptionError = {
'message': "Can not upload successfully!",
'customers': "[]",
'error': "Having an exception!"
}
return JsonResponse(exceptionError, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
elif request.method == 'DELETE':
try:
CustomerModel.objects.all().delete()
# Delete customer data from MongoDB.
collection_name.deleteMany({})
return HttpResponse(status=status.HTTP_204_NO_CONTENT)
except:
exceptionError = {
'message': "Can not delete successfully!",
'customers': "[]",
'error': "Having an exception!"
}
return JsonResponse(exceptionError, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
The POST method works fine and I can see the added document in my MongoDB Compass, but when I try to delete, I get:
DELETE http://localhost:8000/mydjangobaselink/ 500 (Internal Server Error)
All the posts and articles I have seen address communication issues in the browser, local host, etc... but given that my posting method works fine, I don't think that is my issue. Also, in Postman, I get Can not delete successfully!
Can anyone see what might be wrong that I cannot delete from database?
Try with collection_name.delete_many({})
https://pymongo.readthedocs.io/en/stable/api/pymongo/collection.html#pymongo.collection.Collection.delete_many
Edit: as pointed by #NKSM, there is the documentation copied:
delete_many(filter, collation=None, hint=None, session=None)
Delete one or more documents matching the filter:
>>> db.test.count_documents({'x': 1})
3
>>> result = db.test.delete_many({'x': 1})
>>> result.deleted_count
3
>>> db.test.count_documents({'x': 1})
0
I am trying to decrypt encrypted text and return the plain text through ajax call, instead of getting the message response I get an HTML page back as a response. I have tried returning the response as JSON but still getting the same HTML response.
function loadMessage() {
fetch("{% url 'chat:history' chatgroup.id %}")
.then( response => response.json() )
.then( data => {
for (let msg of data) {
var message=msg.message;
$.ajax({
type: 'GET',
url: '',
data: { message: message},
success: function(response){
broadcastMessage(response.message, msg.username, msg.date_created)
}
})
}
})
}
views.py
def get(request):
message = request.GET.get('message')
key = b'\xa8|Bc\xf8\xba\xac\xca\xdc/5U0\xe3\xd6f'
cipher = AES.new(key, AES.MODE_CTR)
nounce = b64encode(cipher.nonce).decode('utf-8')
if request.is_ajax():
nounce_ = self.nounce
msg_ = self.message
key = self.key
nounce = b64decode(nounce_)
ct = b64decode(msg_)
cipher = AES.new(key, AES.MODE_CTR, nounce=nounce)
msg_ = cipher.decrypt(ct)
mwssage = msg_.decode()
return JsonResponse({'message': message})
return render(request, 'chat/room.html')
The path to the decryption view was empty, after adding a path in the url it worked.
Django can only concatenate str (not "list") to str
Error Messages.......
I have some code like this:
function form_submit() {
var arr_category = new Array();
var arr_lawyer = new Array();
var data = new Object();
$('input[name^="category_idx"]').each(function() {
arr_category.push($(this).val());
});
$('input[name^="lawyer_idx"]').each(function() {
arr_lawyer.push($(this).val());
});
console.log("arr_category=="+arr_category);
console.log("arr_lawyer=="+arr_lawyer);
if (confirm('edit??') == true) {
data.arr_category = arr_category;
data.arr_lawyer = arr_lawyer;
call_ajax('/admin/lawyer/recommend_add', data);
//alert("arr_lawyer=="+arr_lawyer);
}
}
Am I doing well in jquery?
look at console.log
arr_category==1,2,3,4,5,6,7,8,9
arr_lawyer==64,37,57,58,130,62,38,51,110
admin_view.py
#csrf_exempt
def recommend_add(request):
print("TEST BANG VALUE------------")
if request.is_ajax() and request.method == "POST":
arr_category = request.GET.getlist('arr_category[]')
print("arr_category------------" + arr_category)
code = 0
msg = "TEST."
data = json.dumps({
'code': code,
'msg': msg,
#'retURL': retURL
})
return HttpResponse(data, content_type='application/json')
I want to print.
error message
TypeError: can only concatenate str (not "list") to str
How can I do that?
In case if you want to return a python interpreter error message to jquery's ajax call then you can use the below syntax.
def recommend_add(request):
print("TEST BANG VALUE------------")
if request.is_ajax() and request.method == "POST":
try:
arr_category = request.GET.getlist('arr_category[]')
print("arr_category------------" + arr_category)
code = 0
msg = "Success"
except Exception as e:
code = '' # anything you want as per your internal logic in case of error.
msg = str(e)
data = json.dumps({
'code': code,
'msg': msg,
#'retURL': retURL
})
return HttpResponse(data, content_type='application/json')
Please ignore my indentation.
in your print code try this
print("arr_category------------:", arr_category)
I am getting this error jinja2.exceptions.UndefinedError: 'values' is undefined. The simple code which I am using with reference from the Flask website http://flask.pocoo.org/docs/0.12/templating/ is below:
#app.context_processor
def utility_processor():
def format_price(amount, currency=u'€'):
return u'{0:.2f}{1}'.format(float(amount), currency)
return dict(format_price=format_price)
#app.route("/file_t")
def file_t():
return render_template('DB.html')
#app.route("/file_ttt", methods=['POST'])
def file_ttt():
if request.method == 'POST':
bMultyTest_plot = request.values.get("bMultyTest_plot")
print(bMultyTest_plot)
return jsonify({'result': 'success', 'value': 0.44})
And the html template code below:
<button type="button" onclick="visualize()">Visualize</button>
<div id='here'></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
function visualize()
{
req = $.ajax({
url : "/file_ttt",
type: "POST",
data: {"bMultyTest_plot": true}
})
req.done(function(data) {
var values = data.value;
document.getElementById("here").innerHTML ="{{format_price(values)}}";
});
}
</script>
Instead of the variable values, if I pass a float value, the function works. like:
document.getElementById("here").innerHTML ="{{format_price(0.33)}}";
but with a variable i am getting the below error:
document.getElementById("demo").innerHTML ="{{format_price(values)}}";
File "<ipython-input-138-4e2a0498745e>", line 17, in format_price
return u'{0:.2f}{1}'.format(float(amount), currency)
jinja2.exceptions.UndefinedError: 'values' is undefined
10.45.65.219 - - [19/Mar/2019 09:56:12] "GET /file_t HTTP/1.1" 500 -
Your template expects values variable, but you don't provide it when calling the render_template function in file_t. You need to provide it like this:
return render_template('DB.html', values=values)
See the documentation for more information.
I am working on a python django web app in which I want to implement internationalization and auto translate the whole app into french or chinese.
I took reference from this site https://www.metod.io/en/blog/2015/05/05/django-i18n-part-1/
But whenever I try to run the app it shows this error:
500: ValueError at /en/get_dashboard_data/ The view
dashboard.views.getDashboardData didn't return an HttpResponse object.
It returned None instead.
And url get_dashboard_data is fetching data through ajax.
url(r'^get_dashboard_data/$', views.getDashboardData, name='getDashboardData'),
view
#login_required(login_url='/')
def getDashboardData(request):
dbname = request.user.username
if request.method == 'POST' and request.is_ajax():
if request.POST.get('action') == 'sale_chart_data':
data = DashboardData(dbname).getSaleChartData()
channel_list = data[0]
data_list = data[1]
print 123, data_list, channel_list
return HttpResponse(json.dumps({'channel_list':channel_list, 'data_list':data_list}), content_type='application/json')
if request.POST.get('action') == 'get_sale_numbers':
sale_data = DashboardData(dbname).getSaleNumbers()
return HttpResponse(json.dumps({'sale_number_data':sale_data}), content_type='application/json')
if request.POST.get('action') == 'get_inventory_numbers':
inventory_data = DashboardData(dbname).getInventoryData()
return HttpResponse(json.dumps({'inventory_data':inventory_data}), content_type='application/json')
if request.POST.get('action') == 'get_order_numbers':
order_data = DashboardData(dbname).getOrderData()
return HttpResponse(json.dumps({'order_data':order_data}), content_type='application/json')
if request.POST.get('action') == 'get_hourly_data':
order_data = DashboardData(dbname).getHourlyData()
sale_data = order_data[1]
count_data = order_data[0]
return HttpResponse(json.dumps({'sale_data':sale_data, 'count_data':count_data}), content_type='application/json')
if request.POST.get('action') == 'top_performers':
data = DashboardData(dbname).getTopPerformers()
inventory_count_dict = data[0]
current_month_dict = data[1]
last_month_dict = data[2]
current_quarter_dict = data[3]
current_year_dict = data[4]
channel_list = data[5]
return HttpResponse(json.dumps({'inventory_count_dict':inventory_count_dict,'current_month_dict':current_month_dict,'last_month_dict':last_month_dict,'current_quarter_dict':current_quarter_dict,'current_year_dict':current_year_dict,'channel_list':channel_list}), content_type='application/json')
if request.POST.get('action') == 'top_products':
product_data = DashboardData(dbname).getTopProducts()
return HttpResponse(json.dumps({'product_data':product_data}), content_type='application/json')
javascript
function getSaleChart(){
$.ajax({
url : "/get_dashboard_data/",
type : "POST",
data : {action:'sale_chart_data'},
success : function(response) {
channel_list = response.channel_list;
data_list = response.data_list;
c3.generate({
bindto: '#sale-chart-30-days',
data:{
x: 'dates',
xFormat: '%b %d',
columns: data_list,
colors:{
Flipkart: '#1AB394',
Paytm: '#BABABA'
},
type: 'bar',
groups: [ channel_list ]
},
axis: {
x: {
type: 'timeseries'
}
}
});
},
error : function(xhr,errmsg,err) {
toastr["error"]("Something Broke.", "Oops !!!.");
console.log(xhr.status + ": " + xhr.responseText);
}
});
}
This is why you should really practice more defensive programming. Though you insist that the request method is POST and it is ajax and the action is sale_chart_data one of the three isn't what you expect it to be.
Your function really should be like follows. It's plain old good practice.
def getDashboardData(request):
dbname = request.user.username
if request.method == 'POST' and request.is_ajax():
action = request.POST.get('action')
if action == 'sale_chart_data':
data = DashboardData(dbname).getSaleChartData()
....
...
# other if conditions here
else :
return HttpResponse(json.dumps({'message':'Unknown action {0}'.format(action)}), content_type='application/json')
else :
return HttpResponse(json.dumps({'message':'Only ajax post supported'}), content_type='application/json')
And then you ought to set break points and evaluate the request to figure out what exactly is happening in this particular request.
My guess would be that your JavaScript does indeed make a POST request to /get_dashboard_data/ but it receives a redirect response (HTTP 301 or 302) to /en/get_dashboard_data/ due to some kind of i18n middleware.
The browser follows the redirect, but the new request to /en/get_dashboard_data/ is a GET request.
Edit:
When following a redirect, the browser will always perform the second request as GET, there is no way to prevent that. You have several options to solve this:
make the initial request to the right application. This means you have to pass your i18n URL into your JavaScript instead of hardcoding it. You can add something like this to your template:
<script>var dashBoardDataUrl = "{% url "name-of-dashboard-url" %}"</script>
as your "actions" just get code, you could just accept a GET request and read the action from query paramters
Split that view into several smaller views that accept GET request so you have something that resembles a REST API.