用type动态创建Form

Posted 2020-10-17 TAMAYURA

type时所有元类的父亲
object是type（object的类型是type），type也是object（type继承自object）
>>> isinstance(object, type)
True
>>> isinstance(type, object)
True
在python中一切皆object，所有对象都是从object继承而来的，type也是object，而object的type是type
>>> type.__base__
<type ‘object‘>
>>> type(object)
<type ‘type‘>


1、type是一切type的类型
2、object是所有对象的基类，type也继承自object
3、object的type是type



去掉object所有对象都不能用了，而去掉type，所有对象还是可以正常运作的，只是没有一个东西标识他的类型了

def score(request, class_id, qn_id):
    """
    :param request:
    :param class_id: 班级ID
    :param qn_id: 问卷ID
    :return:
    """
    student_id = request.session[‘student_info‘][‘id‘]
    # 1. 当前登录用户是否是要评论的班级的学生
    ct1 = models.Student.objects.filter(id=student_id, cls_id=class_id).count()
    if not ct1:
        return HttpResponse(‘你只能评论自己班级的问卷，是不是想转班？‘)

    # 2. 你是否已经提交过当前问卷答案
    ct2 = models.Answer.objects.filter(stu_id=student_id, question__naire_id=qn_id).count()
    if ct2:
        return HttpResponse(‘你已经参与过调查，无法再次进行‘)

    # 3. 展示当前问卷下的所有问题
    # question_list = models.Question.objects.filter(naire_id=qn_id)

    from django.forms import Form
    from django.forms import fields
    from django.forms import widgets

    # # 类：方式一
    # class TestForm(Form):
    #     tp1 = fields.ChoiceField(label=‘路宁傻不傻？‘,choices=[ (i,i) for i in range(1,11)],widget=widgets.Radioselect)
    #     tp2 = fields.ChoiceField(label=‘路宁傻不傻？‘,choices=[ (i,i) for i in range(1,11)],widget=widgets.RadioSelect)
    #     tp3 = fields.CharField(label=‘对路宁的建议？‘,widget=widgets.Textarea)
    #     tp4 = fields.ChoiceField(label=‘路宁帽子颜色？‘,choices=[ (i,i) for i in range(1,11)],widget=widgets.RadioSelect)
    #
    # # 类：方式二
    # MyTestForm = type("MyTestForm",(Form,),{
    #     ‘tp1‘: fields.ChoiceField(label=‘路宁傻不傻？‘,choices=[ (i,i) for i in range(1,11)],widget=widgets.RadioSelect),
    #     ‘tp2‘: fields.ChoiceField(label=‘路宁傻不傻？‘,choices=[ (i,i) for i in range(1,11)],widget=widgets.RadioSelect),
    #     ‘tp3‘: fields.CharField(label=‘对路宁的建议？‘,widget=widgets.Textarea),
    #     ‘tp4‘: fields.ChoiceField(label=‘路宁帽子颜色？‘,choices=[ (i,i) for i in range(1,11)],widget=widgets.RadioSelect),
    # })
    # return render(request,‘score.html‘,{‘question_list‘:question_list,‘form‘:MyTestForm()})
    question_list = models.Question.objects.filter(naire_id=qn_id)
    field_dict = {}
    for que in question_list:
        if que.tp == 1:
            field_dict[‘val_%s‘ % que.id] = fields.ChoiceField(
                label=que.caption,
                error_messages={‘required‘:‘必填‘},
                widget=widgets.RadioSelect,
                choices=[(i, i) for i in range(1, 11)]
            )
        elif que.tp == 2:
            field_dict[‘option_id_%s‘ % que.id] = fields.ChoiceField(
                label=que.caption,
                widget=widgets.RadioSelect,
                choices=models.Option.objects.filter(
                    qs_id=que.id).values_list(‘id‘, ‘name‘))
        else:
            from django.core.exceptions import ValidationError
            from django.core.validators import RegexValidator
            # field_dict[‘x_%s‘ % que.id] = fields.CharField(
            #     label=que.caption, widget=widgets.Textarea,validators=[RegexValidator(regex=""),])
            field_dict[‘content_%s‘ % que.id] = fields.CharField(
                label=que.caption, widget=widgets.Textarea, validators=[func, ])
    # 类：方式二
    MyTestForm = type("MyTestForm", (Form,), field_dict)

    if request.method == ‘GET‘:
        form = MyTestForm()
        return render(request, ‘score.html‘, {‘question_list‘: question_list, ‘form‘: form})
    else:
        # 15字验证
        # 不允许为空
        form = MyTestForm(request.POST)
        if form.is_valid():
            print(form.cleaned_data)
            # {‘x_2‘: ‘3‘, ‘x_9‘: ‘sdfasdfasdfasdfasdfasdfasdf‘, ‘x_10‘: ‘13‘}
            objs = []
            for key,v in form.cleaned_data.items():
                k,qid = key.rsplit(‘_‘,1)
                answer_dict = {‘stu_id‘:student_id,‘question_id‘:qid,k:v}
                objs.append(models.Answer(**answer_dict))
            models.Answer.objects.bulk_create(objs)
            return HttpResponse(‘感谢您的参与!!!‘)

        return render(request, ‘score.html‘, {‘question_list‘: question_list, ‘form‘: form})