django modelformse批量编辑 查询学生班级成绩

复习先知

关于三张表的编辑学生成绩
在跨表查询的对象查询种,只能通过找到两张表的关联的对象,
进行跨表,就是在一对多或多对多的模型找到他们俩的class_id或student_id
在关联时,会通过他们找到所要查询的id,或字段,进而找到他们的字段
进而查询出对象,这个表的对象, .出来
在这种跨三表的途中,编辑跟添加同理.都是通过过
过滤出你要找到学生的对象 学生成绩关联班级成绩  班级成绩关联班级 班级关联学生
这就是这张表的精髓

关于modelformset 可以省去复杂跨表的骚操作
也可以一次性多删除
第一步 
引入from django.forms.models import modelformset_factory

modelformset_factory(含2个变量,还有一个默认为1)
model() modelform()  extra=1
1.实例化对象
2.找到点击的对象 queryset对象
3.实例化对象的方法(queryset=queryset)
返回给页面 自动给你
页面: 一样 但需要标注{{formset.management_form}}

在编辑时候,
1.实例化对象modelformset_factory()
2.formset(request.post)
3.if formset.is_valid()  form的通病
4.formset.save()

复杂版

将字段设置联合唯一

class Meta:
    unique_together=["student","classstudyrecord"]

class ClassStudyRecordView(View):
    def get(self,request):
        ClassStudyRecordlist=ClassStudyRecord.objects.all()
        return render(request,"ClassStudyRecord.html",{"ClassStudyRecordlist":ClassStudyRecordlist})



    def post(self, request):
        print(request.POST)
        func_st = request.POST.get("action")
        num = request.POST.getlist("selected_pk_list")

        print("num", num)
        if not hasattr(self, func_st):
            return HttpResponse("非法输入")
        else:
            func = getattr(self, func_st)
            queryset = ClassStudyRecord.objects.filter(pk__in=num)

            print("queryset", queryset)
            ret = func(request, queryset)
            if ret:
                return ret
            return redirect(request.path)
        #批量删除
    def patch_delete(self, request, queryset):
        queryset.delete()
        #批量查询,利用跨表查询查询创建字段,为了避免添加重复使用联合唯一
    def patch_choice(self,request,queryset):
        try:
            for i in queryset:
                for item in i.class_obj.student_set.all():
                    StudentStudyRecord.objects.create(student=item,classstudyrecord=i)
        except Exception as e:
            pass

跳转页面进行编辑,通过获取form的值构成列表循环录入成绩

def buhui(request,id):

    if request.method=="GET":
        ret=StudentStudyRecord.objects.filter(classstudyrecord_id=id)
        return  render(request,"student_std.html",locals())
    else:

        user = request.POST.getlist("user")
        homework = request.POST.getlist("homework")
        for a,item in enumerate(ClassStudyRecord.objects.filter(pk=id).first().class_obj.student_set.all()):
            print(a,item)
            StudentStudyRecord.objects.filter(student=item).update(score=user[a],homework_note=homework[a])
        return redirect(request.path)

<table>
    <form action="" method="post">
        {% csrf_token %}
        <thead>
        <tr>

            <th>编号</th>
            <th>姓名</th>
            <th>考勤</th>
            <th>成绩</th>
            <th>批语</th>

        </tr>
        </thead>
        <tbody>

        {% for consult_record in ret %}
            <tr>
                <td>{{ forloop.counter }}</td>
                <td>{{ consult_record.student }}</td>
                <td>{{ consult_record.get_record_display }}</td>
                <td><select name="user" id="">
                    {% for foo in consult_record.score_choices %}
                        #进行判断,若是存在值添加selected让其显示,没有显示默认
                        {% if consult_record.score == foo.0 %}
                            <option selected value="{{ foo.0 }}">{{ foo.1 }}</option>
                        {% else %}
                            <option value="{{ foo.0 }}">{{ foo.1 }}</option>
                        {% endif %}
                    {% endfor %}
                    <option value=""></option>
                </select>
                </td>
                <td><input type="text" name="homework" value="{{ consult_record.homework_note }}"></td>
            </tr>
        {% endfor %}


        </tbody>
        <button class="btn btn-default">提交</button>


    </form>
</table>

modelformset 简单版

1.首先引入模块

from django.forms.models import modelformset_factory

2.

后端

from django.forms.models import modelformset_factory

class StudentStudyRecordModelForm(forms.ModelForm):
    class Meta:
        model=StudentStudyRecord
        fields=["score","homework_note"]

class RecordScoreView(View):

    def get(self, request,class_study_record_id):
#modelformset_factory()里面需要2个变量,model和modelform,extra默认为1,显示添加
        model_formset_cls=modelformset_factory(model=StudentStudyRecord,form=StudentStudyRecordModelForm,extra=0)
        queryset = StudentStudyRecord.objects.filter(classstudyrecord=class_study_record_id)
        formset = model_formset_cls(queryset=queryset)
        return render(request,"student/record_score.html",locals())

    def post(self, request,class_study_record_id):
        model_formset_cls = modelformset_factory(model=StudentStudyRecord, form=StudentStudyRecordModelForm, extra=0)
        queryset = StudentStudyRecord.objects.filter(classstudyrecord=class_study_record_id)
        print("request.POST",request.POST)
        formset=model_formset_cls(request.POST)
        if formset.is_valid():
            formset.save()

        print(formset.errors)

        return redirect(request.path)

3.

前端

<hr>



 <div class="panel panel-default">
        <div class="panel-heading">学习记录</div>
        <div class="panel-body">
            <div style=" 680px;margin: 0 auto;">
                <form method="post" action="">
                    {% csrf_token %}
                #这个必须要写
                    {{ formset.management_form }}

                    <table class="table table-bordered">
                        <thead>
                        <tr>
                            <th>姓名</th>
                            <th>考勤</th>
                            <th>作业成绩</th>
                            <th>作业评语</th>
                        </tr>
                        </thead>
                        <tbody>
                        {% for form in formset %}
                            <tr>
                                {{ form.id }}
                                #form.instance.为显示界面,不添加编辑页面
                                <td>{{ form.instance.student }}</td>
                                <td>{{ form.instance.get_record_display }} </td>
                                <td>{{ form.score }} </td>
                                <td>{{ form.homework_note }}</td>
                            </tr>
                        {% endfor %}
                        </tbody>
                    </table>
                    <input type="submit" value="保存">
                </form>
            </div>
        </div>
    </div>
<hr>