Django如何从数据库中获取ID并显示在HTML中 [英] Django how to get id from the database and show in the html

问题描述

这是我的views.py:

this is my views.py:

def gradescales(request):
    grade = list(gradeScalesSetting.objects.all())  # < DB hit once
    gradeScalesSettings = gradeScalesSetting.objects.all()
    rounding = []
    configuration = []

    for i in grade:
        if i.Rounding not in rounding:
            rounding.append(i.Rounding)
        if i.Configuration not in configuration:
            configuration.append(i.Configuration)
    return render(request, 'Homepage/gradescale.html', {"rounding": rounding, "configuration": configuration,"gradeScalesSetting":gradeScalesSettings})

我使用此代码是因为我不想使用distinct()，但是我在获取其ID时遇到了麻烦.

i use this code because i dont want to use distinct(), but im getting trouble in getting their id.

这是我的模板

<select  name="gradescale" id="gradescale" onchange="summary(this.value)"  required="required" >
{% for r in configuration %}
   <option value="{{r}}">{{r}}</option>
{% endfor %}
</select>

这是结果:

我只希望我的 中的值是我选择的列表的ID

i just want that in my the value is the id of what list i selected

这是我的数据库

更新我的尝试

<select  name="gradescale" id="gradescale" onchange="summary(this.value)"  required="required" >
{% for r in configuration %}
   <option value="{{r}}">{{r.id}}</option>
{% endfor %}
</select>

这是它的样子

另一个更新这是更新views.py

Another Update this is the update views.py

for i in grade:
    if i.Rounding not in rounding:
        rounding.append(i)
    if i.Configuration not in configuration:
        configuration.append(i)

更新html

<select  name="gradescale" id="gradescale" onchange="summary(this.value)"  required="required" >
{% for r in configuration %}
   <option value="{{r}}">{{r.id}}</option>
{% endfor %}
</select>

它是什么样子

推荐答案

您需要更改添加到该列表的方式:

You need to change the way you are appending to that list:

for i in grade:
    if i.Rounding not in rounding:
        rounding.append(i)
    if i.Configuration not in configuration:
        configuration.append(i)

在您的模板中:

<select  name="gradescale" id="gradescale" onchange="summary(this.value)"  required="required" >
{% for r in configuration %}
   <option value="{{r.id}}">{{r}}</option>
{% endfor %}
</select>

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