Django templatetag包含的用戶對象

Question

嘿，我一直在爲這個問題苦苦掙扎。我試圖將我的用戶對象傳遞給模板，以便我可以列出它們或列出用戶名。感謝我從這裏得到的幫助，我有這個。

from django.template import Library, Node, Template, VariableDoesNotExist,  TemplateSyntaxError, \ 
         Variable 
from django.utils.translation import ugettext as _ 
from django.contrib.auth.models import User 
from django.conf import settings 
from django.core.exceptions import ImproperlyConfigured 
from django.db import models 

register = Library() 

class GetAllUsers(Node): 
    def __init__(self, varname): 
     # Save the variable that we will assigning the users to 
     self.varname = varname 
    def render(self, context): 
     # Save all the user objects to the variable and return the context to the template 
     context[self.varname] = User.objects.all() 
     return '' 

@register.tag(name="get_all_users") 
def get_all_users(parser, token): 
    # First break up the arguments that have been passed to the template tag 
    bits = token.contents.split() 
    if len(bits) != 3: 
     raise TemplateSyntaxError, "get_all_users tag takes exactly 2 arguments" 
    if bits[1] != 'as': 
     raise TemplateSyntaxError, "1st argument to get_all_users tag must be 'as'" 
    return GetAllUsers(bits) 

#register.tag('get_all_users', get_all_users) 

當我使用這個代碼

 
{% load getusers %} 
{% get_all_users as allusers %} 
{% for user in allusers %} 
    {{ user }} 
{% endfor %} 

在我的模板我被抓了類型錯誤，而渲染：unhashable類型： '名單'。它是特定的{％get_all_users作爲所有用戶％}這是造成它。我嘗試了{％get_all_users％中的用戶}，它會通過但不打印任何內容。

回溯

 
Traceback: 
File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 
    111.       response = callback(request, *callback_args, **callback_kwargs) 
File "/usr/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view 
    23.     return view_func(request, *args, **kwargs) 
File "/home/ajunkkil/Django/basedraft/messages/views.py" in compose 
    91.  }, context_instance=RequestContext(request)) 
File "/usr/lib/python2.7/site-packages/django/shortcuts/__init__.py" in render_to_response 
    20.  return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) 
File "/usr/lib/python2.7/site-packages/django/template/loader.py" in render_to_string 
    188.   return t.render(context_instance) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in render 
    123.    return self._render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in _render 
    117.   return self.nodelist.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/usr/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    127.   return compiled_parent._render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in _render 
    117.   return self.nodelist.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/usr/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    127.   return compiled_parent._render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in _render 
    117.   return self.nodelist.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/usr/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    64.    result = block.nodelist.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/usr/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    64.    result = block.nodelist.render(context) 
File "/usr/lib/python2.7/site-packages/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/usr/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/home/ajunkkil/Django/basedraft/messages/templatetags/getusers.py" in render 
    19.   context[self.varname] = User.objects.all() 
File "/usr/lib/python2.7/site-packages/django/template/context.py" in __setitem__ 
    53.   self.dicts[-1][key] = value 

Exception Type: TemplateSyntaxError at /messages/compose/ 
Exception Value: Caught TypeError while rendering: unhashable type: 'list' 

Answer 1

如果您'使用最新的開發版本，有一個新的標籤快捷方式，assignment tags，它可以爲你做這一切。然後，你可以只是做：

@register.assignment_tag 
def get_all_users(): 
    return User.objects.all() 

與您的代碼，雖然實際的問題是，你的論點整個列表傳遞給標籤實例：

return GetAllUsers(bits) 

時，你應該剛剛路過的包含變量名稱位：

return GetAllUsers(bits[2]) 

最後，但是，如果這僅僅是一個模板，我不明白爲什麼你不認爲這樣做，因爲programmersbook建議。

Answer 2

您是否嘗試過使用inclusion tag？

據我所知，它似乎坐在丹尼爾提到的simple tag和assignment tag之間。這意味着 數據不會像簡單標籤那樣直接輸出。並且在assignment tag將數據存儲在直接迭代的變量中的情況下，包含標籤需要用於呈現數據的模板片段。

@register.inclusion_tag('users.html') 
def show_users(): 
    users = user.objects.all() 
    return {'users': users} 

然後，你可以寫一個模板片斷（users.html）恰好使您的用戶列表中的一部分。

Answer 3

當也許是更好地做到這一點在上下文中，看不到一個點，使用標籤

觀點：

from django.contrib.auth.models import User 
from django.shortcuts    import render_to_response 

def users(request): 
    user_list = User.objects.all() 

    ctx = {'user_list':user_list} 

    render_to_response('temp.html', ctx) 

模板：

{% for user in user_list %} 
    {{ user }} 
{% endfor %}