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

views.py

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)

views.py录入成绩

 <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>

前端.html

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)

modelformset 批量编辑

3.

前端

 <hr>

  <div class="panel panel-default">
         <div class="panel-heading">学习记录</div>
         <div class="panel-body">
             <div style="width: 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>

前端.html