Edit view on Django not displaying object into page

Question

I got a form page to edit my objects from database, but when I access them with the edit button it goes to the url http://localhost:8000/acoes/edit/1 , but I cannot see the object details in the form field. It is just empty as if I was going to create a new object (and it creates if I try)

Any suggestion? Every post and question that I found online states that the code would work being just like this, but it isnt.

on the template acoes_form.html

<form method="post">

    <div class="form-group">
        {% csrf_token %}
        {{form.as_p}}
    </div>
    <input type="submit" value="Gravar dados" class="btn btn-success" /> 
</form>

on views.py

@login_required(login_url="/login")
def acoes_edit(request, pk, template_name='acoes/acoes_form.html'):
    if request.user.is_superuser:
        acoes= get_object_or_404(Acoes, pk=pk)
    else:
        acoes= get_object_or_404(Acoes, pk=pk, user=request.user)
    form = AcoesForm(request.POST or None, instance=acoes)
    if form.is_valid():
        form.save()
        return redirect('acoes_list')
    return render(request, template_name, {'form':AcoesForm})

on forms.py

class AcoesForm(ModelForm):

    #bunch of fields definitions
    #...
    #

    class Meta:
        model = Acoes
        fields = ['id_pedido','bl_msg','tb_msg','bl_shell','tb_shell','obs','ativo']

Answer 1

Change your view as follows:

@login_required(login_url="/login")
def acoes_edit(request, pk, template_name='acoes/acoes_form.html'):
    if request.user.is_superuser:
        acoes= get_object_or_404(Acoes, pk=pk)
    else:
        acoes= get_object_or_404(Acoes, pk=pk, user=request.user)
    form = AcoesForm(request.POST or None, instance=acoes)
    if form.is_valid():
        form.save()
        return redirect('acoes_list')
    return render(request, template_name, {'form': form})

You were accidentally referring to the form class rather than the form instance.

On a side note you may want to only save the form if the person POSTed data to the view eg

@login_required(login_url="/login")
def acoes_edit(request, pk, template_name='acoes/acoes_form.html'):
    if request.user.is_superuser:
        acoes= get_object_or_404(Acoes, pk=pk)
    else:
        acoes= get_object_or_404(Acoes, pk=pk, user=request.user)
    form = AcoesForm(request.POST or None, instance=acoes)
    if request.method == 'POST' and form.is_valid():
        form.save()
        return redirect('acoes_list')
    return render(request, template_name, {'form': form})

Answer 2

错误在最后一行，您传递的是表单类，而不是表单对象。

return render(request, template_name, {'form':form})