Django - 以一种形式保存多个选择框答案

【问题标题】：Django - Saving multiple selection boxes in one formDjango - 以一种形式保存多个选择框
【发布时间】：2018-02-19 07:19:18
【问题描述】：

我需要以一种形式保存多个选择，但它不会将值保存到我的模型中。这是表单的外观：

这是我的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()

这是我的观点.py

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

 <form action="{% url 'project:rating' %}" method="post">
      {% csrf_token %}
      {% for year in years %}
        <li class=cap_select>
          <div id=fyc>{{year.fy_year}}</div>
          <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}}>
        </li>  
      {% endfor %}
        <br>
        <input id=save_cap type="submit" value="Save">
      </form>

我得到了一个

“不存在新年匹配查询。”并且无法保存数据。

我已经研究了几天了。任何帮助将不胜感激。

【问题讨论】：

标签： python django django-models django-forms django-templates

【解决方案1】：

是的，你是对的

POST 数据不是作为字典来的。

您正在循环播放年份并在表单中呈现select 和input 标签，并且所有select 和input 标签的name 属性与rating 和year 相同

在这种情况下，当您提交表单时，您将获得 rating 和 year 的列表，因此您应该在从 request.POST QueryDict 获取它时使用 getlist() 方法。

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

如果上述方法不起作用，请使用它

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

更新您的费率方法，例如。

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]
           )

改变方法调用。

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

【讨论】：

谢谢。好的。所以现在我得到：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。
您需要相应地更改您的费率方法
您正在将列表传递给rates 并创建选择，但评级和年份是外键，不会分配给列表。
我怎样才能保存这个表格呢？我是编程新手。非常感谢您的耐心等待。
看到你正在传递列表，所以在创建 Choices 对象之前你需要循环它，所以它会在你的 rates 方法中创建多个选择对象

【解决方案2】：

所以这就是最后的工作：

models.py

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

<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>

【讨论】：