Question

我正在学习Django，在我对给定的代码感到困惑之前，它一直很不错。有人可以逐行向我解释那里发生了什么吗？

from .forms import NewsLinkForm
from .models import NewsLink

class NewsLinkUpdate(View):
    form_class = NewsLinkForm
    template_name = 'organizer/newslink_form_update.html'

    def get(self, request, pk):
        newslink = get_object_or_404(NewsLink, pk=pk)
        context = {
            'form':self.form_class(instance=newslink),
            'newslink':newslink,
        }
        return render(request, self.template_name, context)

    def post(self,request,pk):
        newslink = get_object_or_404(NewsLink, pk=pk)
        bound_form = self.form_class(request.POST, instance=newslink)
        if bound_form.is_valid():
            new_newslink = bound_form.save()
            return redirect(new_newslink)
        else:
            context = {
                'form':bound_form,
                'newslink':newslink,
            }
            return render(
                request,
                self.template_name,
                context
             )

Answer 1

我添加了一些评论，希望您能理解

from .forms import NewsLinkForm
from .models import NewsLink

class NewsLinkUpdate(View): # class based view
    form_class = NewsLinkForm # class of a form which seems to be in the view
    template_name = 'organizer/newslink_form_update.html' # Link to the html template

    def get(self, request, pk): # this is called when someone makes a GET request to your view, always takes in the request, additionally, a pk
        newslink = get_object_or_404(NewsLink, pk=pk) # get object of model NewsLink by passed in pk, if there is none, returns 404
        context = { # define context object, usually gets passed in into the template
            'form':self.form_class(instance=newslink), # there is a form in the context, which fills with data from out NewsLink object
            'newslink':newslink, # our NewsLink object
        }
        return render(request, self.template_name, context) # renders the page using the specified template and context

    def post(self,request,pk): # this is called when someone makes a POST request to your view
        newslink = get_object_or_404(NewsLink, pk=pk) # get object of model NewsLink by passed in pk, if there is none, returns 404
        bound_form = self.form_class(request.POST, instance=newslink) # get an object of the form, filled with data from the post request and an instance of your object
        if bound_form.is_valid(): # if the form data is valid
            new_newslink = bound_form.save() # save changes to your form, automatically saves changes to your NewsLink
            return redirect(new_newslink) # I only know redirect to redirect you to another view...
        else:
            context = { # context, as above
                'form':bound_form, # your form with data
                'newslink':newslink, # your NewsLink object
            }
            return render(
                request,
                self.template_name,
                context
             ) # renders the page using the specified template and context

要求的Django views.py代码说明

1 个答案: