Re: Updating an instance.

Dear Mitui,

I saw 2 questions in your inquiry:

1. Regarding to Form behaviour

2. Regarding to log message

Let me clarify second:

Provided message said that server responded with 302 - redirect response.

It is correct as you said in your view method:

return HttpResponseRedirect('/login/response/'+str(a.userName.username))

Now is about first.

You printed 'using instance argument'. I asume that you are looking of a way add user info to POST data using form. It does not work in this way. That is why user info is cleared.

Initial value is used to pre populate form when it is no POST data yet, like when you generate form on GET response.

To get what you need I would suggest add user info differently.

You have some options here.

1 - change your form - remove user field from it. You did not provide code of your form. But I believe that you are using user field in the form.

2 - add user info to POST query. It is not recommended way as this POST QuerySet is immutable. So to do that you need to create new QuerySet from previous one and put user info there.

I hope that make some sense.

Regards,

Constantine C.

On Fri, Sep 29, 2017 at 3:11 PM, Mitul Tyagi <mitultyagi45@gmail.com> wrote:

<form role="text" action="" method="post">

{% csrf_token %}

<ul>

<li class="bar">1st City: {{form.city1}}</li>

<li class="bar">2nd City: {{form.city2}}</li>

<li class="bar">3rd City: {{form.city3}}</li>

<li class="bar">4th City: {{form.city4}}</li>

<li class="bar">5th City: {{form.city5}}</li>

</form>

Is the template part.....

On Saturday, September 30, 2017 at 12:16:07 AM UTC+5:30, Mitul Tyagi wrote:

Problem 1 :

I have a model with  six fields. One is userName and other five are five favourite cities.....I want to update these five cities....but when I update them using instance argument the userName becomes NONE....I am using the id field to update....the cities are updated for the id but the userName is lost. Any help for that..The code I am using is 

"

def Update(request, city_id):

    if request.method == "POST":

        a= City.objects.get(pk= int(city_id))      

        print "User Updated is : ",a.userName.username                        

        f = CityForm(request.POST, instance=a, initial={'userName.': str(a.userName.username)})

        f.save()

        return HttpResponseRedirect('/login/response/'+str(a.userName.username))

    else:

        all_city = City.objects.all()

        for city in all_city:

            if int(city.pk) == int(city_id):

                a = city

        print "User: ",a.userName.username        

        form_class = CityForm(initial={'userName': a.userName})

        return render(request, 'formsub.html', {'form': form_class,'x':a.userName.username,'id':a.id})     

" 

There is an error in the method also...

Console prints this whenever post request is made.

" [29/Sep/2017 18:43:43] "POST /login/update/18/ HTTP/1.1" 302 0

"

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Sincerely yours,

Constantine C

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