Question

我想使用此edit_student.html页面编辑和更新学生信息。当我进入编辑页面时，所有存储的值都会出现，但复选框项目和日期字段除外 我如何在编辑时显示已选中的项目和已添加的日期

models.py

class Student(models.Model):
    name = models.CharField(max_length=100)
    courses = models.CharField(max_length=500)
    address = models.CharField(max_length=200)
    email = models.EmailField()
    phone = models.CharField(max_length=15)
    image = models.ImageField(upload_to='Students',blank=True)
    joined_date = models.DateTimeField()

views.py

 def editstudent(request,id):
    student = Student.objects.get(id=id)
    courses = Course.objects.all()
       try:
    for course in courses:
         course.has_checked = student.filter(courses=course) # this didn't worked for me
except Exception:
    pass 
    return render(request,'students/edit_student.html',{'student':student,'courses':courses})


 def updatestudent(request,id):
student = Student.objects.get(id=id)
form = AddStudentForm(request.POST,instance=student)
if form.is_valid():
    student = form.save(commit=False)
    student.save()
    messages.success(request,'Student with name  {}  updated'.format(student.name))
    return redirect('students:view_student')
else:
    messages.error(request,'Error in form.Try Again')
return render(request,'students/edit_student.html',{'student':student})

edit_student.html

                     <div class="form-group">
                        <h5>Joined Date <span class="text-danger">* 
                    </span></h5>
                                #it doesnot display already added value <div class="controls">
                            <input type="date" name="joined_date"
                   value=" {{student.joined_date|date:'m-d-Y'}}"
               data-validation-required-message="This field is required" 
                 class="form-control" required> </div>
                    </div>
                 <div class="form-group">
                   <h5>Courses <span class="text-danger">*</span></h5>
                   <div class="controls">
                     {% for course in courses %}
                     <input name ="courses" type="checkbox" id="course- 
                 {{course.id}}" 
               value="{{course.title}}"># 
                it doesnot display already checked courses

                     <label for="course-{{course.id}}">{{course.title}} 
                  </label>
                     {% endfor %}
                   </div>
                 </div

                </div>

Answer 1

浏览器使用YYYY-mm-dd格式的<input type="date">。

<input type="date" name="joined_date" value="{{ student.joined_date|date:'Y-m-d' }}">

要显示复选框，请在为每个课程计算值has_checked之后，按如下所示呈现每个复选框：

<input name="courses" type="checkbox" id="course-{{ course.id }}"
       value="{{ course.id }}" {% if course.has_checked %} checked {% endif %}>

更新

如果您在ManyToManyField和Student之间有Course，则可以使用注释来计算has_checked。

from django.db.models import Q, Count

courses = Course.objects.annotate(
    has_checked=Count('students', filter=Q(students=student))
)

如何在Django模板中显示选中的复选框项目和日期时间字段

1 个答案: