django使用Modelform保存数据

Question

I use AJAX to save data into a database and I have a question. The message board will send 3 variables, which are inputted by the user: name, email, and message. It didn't send the IP, but I have to save it into the database. How can I edit the views.py to get the IP? Please guide me.

Thank you very much

forms.py

class MessageForm(ModelForm):
    class Meta:
        model = Message
        fields = ['name', 'email', 'message','ip']

views.py

def create_post(request):
    if request.method == 'POST':
        form = MessageForm(request.POST)
        if form.is_valid():
            # ip = request.META['REMOTE_ADDR']  #not work
            m = form.save()
            return HttpResponse(2)
    else:
        form = MessageForm()            

this my ajax part: I didn't sent ip in here,

$.ajax({
        url: '{% url 'core:create_post' %}',
        data: {
                "name":name,
                "email":email,
                "message":message,
        },
        type: 'POST',
        async: false,
        dataType: 'json',
        error: function(ts){
            alert('操作失敗');
            window.location.reload();
        },
        success: function(dataArr){
            if(dataArr == 2){ 
                alert('Sudccess!');
                window.location.reload();
            }else{
                alert('something wrong!');
                window.location.reload();
            }
        }
    });

Answer 1

def create_post(request):
    if request.method == 'POST':
        form = MessageForm(request.POST)
        form.ip = request.META['REMOTE_ADDR'] # added 'ip' to the form object here
        if form.is_valid():                 
            m = form.save()
            return HttpResponse(2)
    else:
        form = MessageForm()   

Answer 2

You need to remove the ip field from ModelForm . Otherwise form.is_valid() will return False because the ip field is not from user input.

Next you have to save the ModelForm with commit=False . This will not store the data in database but return a Model object. Then you can set the ip property of that model object and save that model object. Your code will be something like this:

if form.is_valid():
    ip = request.META['REMOTE_ADDR']  #get the ip address
    m = form.save(false)
    m.ip = ip #set the ip address here
    m.save() # now saved to database

Answer 3

The good part of a model form is that is always has an instance attribute that holds the actual model instance, even if it doesn't exist yet in the database. Rafiqunnabi's code can be shortened to this:

if form.is_valid():
    form.instance.ip = request.META['REMOTE_ADDR']
    m = form.save()