显示 Django 变量时，\'Could not parse the remainder\' 错误

Question

我有一个 Django 应用程序，用于显示某些人的记录。我不想为每个人的记录制作一个模板，而是想创建一个视图和一个模板，可以动态显示不同人的记录。当我呈现包含此人信息的变量的模板时，出现此错误：

Could not parse the remainder: '('first_name',flat=True[0]'from'modelname.objects.values_list('first_name', flat=True)[0]'

我已经将有关人员的信息存储在几个不同的模型中，这些模型作为列表包含在 records 变量中。

视图.py

def records(response, firstname):

#firstname is a variable containing the name entered into the url by the user
#the function will check if a record model with that first name is in records
#records is a list containing all record models

foundmodel = False

for i in range(len(records)):
    firstname = firstname[0].upper() + firstname[1:] #Makes first letter uppercase
    if firstname == records[i].objects.values_list('first_name', flat=True)[0]:
        modelname = records[i]

#modelname will be passed to the template so the correct model can be referenced

        foundmodel = True
        break
    else:
        continue
 #the loop will keep iterating until a match is found or there are no more record models to try

if foundmodel == True:
    return render(response, 'base2.html', {'modelname':modelname})

 #the template will be rendered with the information from the correct model if a model with the 
 #entered name is found

if foundmodel == False:
    return HttpResponse('Person does not exist')

#if a model with the entered name is not found, this page will be rendered

相关的 base2.html，如果找到具有所选名称的模型，将呈现该文件

<div class="col-8-xs">
        <img style="width:100px; height:100px;" alt="person's picture'" src="#">

        <br>
        <br>
        <br>
        <br>

        <p>Full Name:{{modelname.objects.values_list('first_name', flat=True)[0]}}&nbsp;{{modelname.objects.values_list('last_name', flat=True)[0]}}</p>

        <p>Age:{{modelname.objects.values_list('age', flat=True)[0]}}</p>

        <p>Occupation:{{modelname.objects.values_list('occupation', flat=True)[0]}}</p>
    </div>

网址.py

from django.urls import path

from app_3 import views

urlpatterns = [
    path('home', views.homepage, name='homepage'),
    path('base', views.base, name='base'),
    path('<str:firstname>/records', views.records, name='records')

]

Answer 1

您在模板中的显示逻辑，属于视图。

方案一（推荐）

不确定为什么需要做所有的 values_list()，但也许我遗漏了一些东西。假设你的 modelname 类有 first_name、last_name、occupation 字段，那么你需要在模板中做的就是：

<p>Full Name:{{ modelname.first_name }} {{ modelname.last_name }}</p>
<p>Age:{{ modelname.age }}</p>
<p>Occupation:{{ modelname.occupation }}</p>

方案二
现在如果有你需要做的逻辑，将其写在您的视图中，然后将其作为变量传递，如下所示（但同样，我不认为这是你需要或想要的):

def records(response, firstname):

    context = {
        'first_name': modelname.objects.values_list('first_name', flat=True)[0]
        'last_name': modelname.objects.values_list('last_name', flat=True)[0]
        'age': modelname.objects.values_list('age', flat=True)[0]
        'occupation': modelname.objects.values_list('occupation', flat=True)[0] 
    }

    return render(response, 'base2.html', context)

然后像这样访问模板中的这些变量：

<p>Full Name: {{ first_name }} {{ last_name }}</p>
<p>Age: {{ age }}</p>
<p>Occupation: {{ occupation }}</p>