在Django中使用formset_factory

Question

我是Django的新用户,我使用以下代码生成表单

class GetMachine(forms.Form):
    Machine_Name = forms.CharField(max_length=20) 
    Number_of_lines = forms.IntegerField(max_value=10)

class GetLine(forms.Form):
    Line_name = forms.CharField(max_length=20)

def install(request):
    if request.method == 'POST':
        form = GetMachine(request.POST) 
        if form.is_valid(): # All validation rules pass
            # Process the data in form.cleaned_data
            form = GetLine()
            return render_to_response('install.html', { 'form': form, })
    else:
        form = GetMachine() # An unbound form

    return render_to_response('install.html', { 'form': form, })    

如何修改上面的代码,使得"Number_of_lines"用于创建n个"Line_Name"表单字段.

例如,如果Number_of_lines的值为2,我再次要求用户输入两行的名称

第1行的名称:

第2行的名称:

Answer 1

从POST数据中获取number_of_lines后,可以将该数字作为'extra'参数传递给formset工厂.

from django.forms.formsets import formset_factory
...
        form = GetMachine(request.POST) 
        if form.is_valid(): # All validation rules pass
            number_of_lines = form.cleaned_data['Number_of_lines']

            GetLineFormSet = formset_factory(GetLine, extra=number_of_lines)
            formset = GetLineFormset()
            form = GetLine()
...

Protip: 您还可以使用max_num参数将行数保持在合理的限制:

GetLineFormSet = formset_factory(GetLine, extra=number_of_lines, max_num=10)