尝试通过Django模板填充HTML时获取keyerror

Question

我正在制作一个填充表格的HTML模板。value中的show引用了我的模型Show，其值为title、network、release和desc。以下是HTML：

--根据Abdul Aziz Barkat的建议修订--

{% for show in object_list %}
                    <tr>
                        <td>{{ show.id }}</td>
                        <td>{{ show.title }}</td>
                        <td>{{ show.network }}</td>
                        <td>{{ show.release }}</td>
{% endfor %}

My views.py：

def shows(request):
    object_list = Show.objects.all()
    context = {'object_list': object_list}
    return render(request, 'shows.html', context)

我可以在shell中打印代码，如上所示。但当尝试填充我的模板时，它会抛出一个错误：

Traceback (most recent call last):
  File "C:\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 470, in parse
    compile_func = self.tags[command]
KeyError: 'show.id'

我不确定base.py->；compile_func=self.tags[command]执行此操作。我假设问题来自我的模板和views.py之间的错误通信，但我无法解决

以下是完整的回溯：

Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\codingdojo\python_stack\django\django_fundamentals\semi_restful_tv\tv_shows_app\views.py", line 7, in shows      
    return render(request, 'shows.html', context)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\shortcuts.py", line 36, in render  
    content = loader.render_to_string(template_name, context, request, using=using)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\loader.py", line 61, in render_to_string
    template = get_template(template_name, using=using)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\backends\django.py", line 
34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\engine.py", line 143, in get_template
    template, origin = self.find_template(template_name)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\engine.py", line 125, in find_template
    template = loader.get_template(name, skip=skip)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\loaders\base.py", line 29, in get_template
    return Template(
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 156, in __init__
    self.nodelist = self.compile_nodelist()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 194, in compile_nodelist
    return parser.parse()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 478, in parse
    raise self.error(token, e)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 476, in parse
    compiled_result = compile_func(self, token)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\defaulttags.py", line 952, in do_if
    nodelist = parser.parse(('elif', 'else', 'endif'))
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 478, in parse
    raise self.error(token, e)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 476, in parse
    compiled_result = compile_func(self, token)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\defaulttags.py", line 811, in do_for
    nodelist_loop = parser.parse(('empty', 'endfor',))
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 472, in parse
    self.invalid_block_tag(token, command, parse_until)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\template\base.py", line 522, in invalid_block_tag
    raise self.error(
django.template.exceptions.TemplateSyntaxError: Invalid block tag on line 26: 'show.id', expected 'empty' or 'endfor'. Did you forget to register or load this tag?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\utils\deprecation.py", line 94, in 
__call__
    response = response or self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line3 
6, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\utils\deprecation.py", line 94, in 
__call__
    response = response or self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\utils\deprecation.py", line 94, in 
__call__
    response = response or self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in techi 
cal_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\utils\deprecation.py", line 94, in 
__call__
    response = response or self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\utils\deprecation.py", line 94, in 
__call__
    response = response or self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\utils\deprecation.py", line 94, in 
__call__
    response = response or self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\utils\deprecation.py", line 94, in 
__call__
    response = response or self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Python\lib\wsgiref\handlers.py", line 137, in run
    self.result = application(self.environ, self.start_response)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\contrib\staticfiles\handlers.py", line 65, in __call__
    return self.application(environ, start_response)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\wsgi.py", line 141, in __call__
    response = self.get_response(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\base.py", line 75, in get_response
    response = self._middleware_chain(request)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\core\handlers\exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "C:\codingdojo\python_stack\my_environments\djangoPy3Env\lib\site-packages\django\views\debug.py", line 332, in get_traceback_html
    t = DEBUG_ENGINE.from_string(fh.read())
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa6 in position 9737: illegal multibyte sequence

这里有一句重要的话，可以帮助比我更有知识的人解决问题：

django.template.exceptions.TemplateSyntaxError: Invalid block tag on line 26: 'show.id', expected 'empty' or 'endfor'. Did you forget to register or load this tag?

但是由于我可以在Shell中打印show.id，我不明白为什么它没有注册到我的模板中

Answer 1

会话变量并不是人们仅仅因为希望在模板中呈现变量而使用的。会话变量用于存储当前用户的值，直到会话持续。例如，如果我们想存储一些临时值，这一点特别有用，一些示例用法如下：

• 如果我们允许用户在网站上的明暗模式（CSS）之间切换，我们可以在会话中轻松设置他们的首选模式
• 希望存储匿名用户篮的电子商务网站可以在会话中设置其篮的序列化值

如果要在模板中呈现变量，应使用上下文来实现此目的。render快捷方式函数需要上下文（dictionary）作为其第三个参数：

def shows(request):
    object_list = Show.objects.all()
    context = {'object_list': object_list}
    return render(request, 'shows.html', context)

现在在模板中：

{% for show in object_list %}
    <tr>
        <td>{{ show.id }}</td>
        <td>{{ show.title }}</td>
        <td>{{ show.network }}</td>
        <td>{{ show.release }}</td>
    </tr>
{% endfor %}

另外，看看您的错误，您的模板中有类似{% show.id %}的东西，语法{% something %}用于模板标记。对于引用变量，它应该是{{ show.id }}