Python Django-在一个表单中保存多个选择框

我需要在一个表单中保存多个选择，但它不会将值保存到我的模型中。以下是表单的外观：

这是我的模特

class ChoiceManager(models.Manager):
    def rates (self, Task_id, rating2, yo):
        assignment = Assignment.objects.get(id=Assignment_id)
        rating = rating2
        yo = FiscalYear.objects.get(fy_year=years)
        for i in range(len(rating2)):
            rated = Prog_capability.objects.create(
            task = task, 
            rating2 = rating[i],
            fy = yo[i]
        )

class NewYear(models.Model):
    year = models.CharField(max_length=5)
    new_year = models.CharField(max_length=5)

class Choice(models.Model):
    rating = models.CharField(max_length=255, blank=True, null=True)
    year = models.ForeignKey(NewYear, related_name="choices")
    assignment = models.ForeignKey(Assignment, related_name="choice")
    objects = ChoiceManager()

这是我的观点

def task_rating(request, Assignment_id):
    ratings = request.POST.getlist('rating2',[])
    years= request.POST.getlist('yo",[])
    rates= Choice.objects.rates(Assignment_id, ratings, years)
    return redirect ((reverse('Project:assignment_page', kwargs={'Assignment_id': Assignment_id})))

HTML

{%csrf_令牌%}
{年份百分比，以年为单位%}

{year.fy_year}
从列表中选择
高
中等
低
不适用

{%endfor%}

我得到一份工作

“新年匹配查询不存在。”并且无法保存数据

这件事我已经谈了好几天了。任何帮助都将不胜感激

是的，你是对的

POST数据不是作为字典提供的

您正在循环年份并在表单中呈现

select

和

input

标记，所有

select

和

input

标记的

name

属性与

rating

和

year

标记相同

在这种情况下，当您提交表单时，您将得到一个

评级

和

年份

的列表，因此您应该使用

getlist（）

方法从request.POST QueryDict中获取它

request.POST.getlist('rating[]')
request.POST.getlist('year[]')

如果上述方法不起作用，请像这样使用

request.POST.getlist('rating', [])
request.POST.getlist('year', [])

像这样更新你的费率方法

class ChoiceManager(models.Manager):
    def rates (self, Assignment_id, rating, year):
        ...
        # you can use year also to find the length
        for i in range(len(rating)): 
           rated = Choice.create(
              assignment = assignment, 
              year = year[i],
              rating = rating[i]
           )

更改方法调用

rates = Choice.objects.rates(Assignment_id,request.POST.getlist('rating[]'), request.POST.getlist('year[]'))

---

因此，这就是最终起作用的原因：

models.py

class ChoiceManager(models.Manager):
    def rates (self, Task_id, rating2, yo):
        assignment = Assignment.objects.get(id=Assignment_id)
        rating = rating2
        yo = FiscalYear.objects.get(fy_year=years)
        for i in range(len(rating2)):
            rated = Prog_capability.objects.create(
            task = task, 
            rating2 = rating[i],
            fy = yo[i]
        )

class NewYear(models.Model):
    year = models.CharField(max_length=5)
    new_year = models.CharField(max_length=5)

class Choice(models.Model):
    rating = models.CharField(max_length=255, blank=True, null=True)
    year = models.ForeignKey(NewYear, related_name="choices")
    assignment = models.ForeignKey(Assignment, related_name="choice")
    objects = ChoiceManager()

class ChoiceManager(models.Manager):
def rates (self, Assignment_id, rating2, years, rating_id):
    Assignment = Assignment.objects.get(id=Assignment_id)
    rating = rating2
    rating_id = rating_id
    for i in range(len(rating2)):
        year =NewYear.objects.get(fy_year=years[i])
        rated = Choice.objects.create(
        assignment = assignment, 
        rating = rating[i],
        fy = year,
        rating_id = rating_id[i]
    )

views.py

def task_rating(request, Assignment_id):
    ratings=  request.POST.getlist('rating2',[])
    years=  request.POST.getlist('yo',[])
    rating_id = request.POST.getlist('rating_id',[])
    rates = Choice.objects.rates(Assignment_id,ratings, years,rating_id)
    return redirect ((reverse('assignment:assignment_page', kwargs={'Assignment_id': Assignement_id})))

HTML

{%csrf_令牌%}
{年份百分比，以年为单位%}
从列表中选择
高
中等
低
不适用
{%endfor%}

谢谢。好啊现在我得到：ValueError…无法分配“[]”：“Choice.rating”必须是“rating”实例。你提到的两个getlist都是一样的。你需要根据你正在将列表传递到

rates

并创建选项来更改你的rates方法，但是rating和year是外键，它不会与list一起分配。那么我如何保存此表单？我是编程新手。非常感谢您的耐心。请看，您正在传递列表，因此在创建选项对象之前，您需要在列表上循环，这样它将在您的rates方法中创建多个选项对象

<form action="{% url 'project:rating' %}" method="post">
  {% csrf_token %}
  {% for year in years %}
      <select name="rating2" id="{{assignment.id}}-{{year.id}}">
        <option>Choose From List</option>
        <option class=hi value="high">High</option>
        <option class=med value="medium">Medium</option>
        <option class=low value="low">Low</option>
        <option class=na value="n/a">N/A</option>
      </select> 
      <input type="hidden" name="yo" value={{year.fy_year}}>
      <input type="hidden" name="rating_id" value="{{tasks.id}}-{{year.id}}">
  {% endfor %}
    <br>
    <input id=save_cap type="submit" value="Save">
  </form>