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POPractical Django Projects - Pages 183 and 184
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copied!<p>On pages 183 and 184 there is the following code :</p> <pre><code>def edit_snippet(request, snippet_id): snippet = get_object_or_404(Snippet, pk=snippet_id) if request.user.id != snippet.author.id: return HttpResponseForbidden() if request.method == 'POST': form = SnippetForm(instance=snippet, data=request.POST) if form.is_valid(): snippet = form.save() return HttpResponseRedirect(snippet.get_absolute_url()) else: form = SnippetForm(instance=snippet) return render_to_response('cab/snippet_form.html',{ 'form': form, 'add': False }) edit_snippet = login_required(edit_snippet) </code></pre> <p>Why is it necessary to add a data attribute here :</p> <pre><code>form = SnippetForm(instance=snippet, data=request.POST) </code></pre> <p>Isn't the instance attribute enough ?</p> <p>If the request method isn't POST, then it could be anything but usually it's a GET method. Why is there no data attribute in this case ? Why is it necessary to take into account other request methods ? Couldn't we just write :</p> <pre><code>def edit_snippet(request, snippet_id): snippet = get_object_or_404(Snippet, pk=snippet_id) if request.user.id != snippet.author.id: return HttpResponseForbidden() if request.method == 'POST': form = SnippetForm(instance=snippet, data=request.POST) if form.is_valid(): snippet = form.save() return HttpResponseRedirect(snippet.get_absolute_url()) return render_to_response('cab/snippet_form.html',{ 'form': form, 'add': False }) edit_snippet = login_required(edit_snippet) </code></pre> <p>It sounds more logical to me not to let the user edit his snippet if the request method is not POST. Can you explain me these points ?</p>

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