我有一些东西在设置。py，我想能够从模板访问，但我不知道如何做到这一点。我已经试过了
{{CONSTANT_NAME}}
但这似乎并不奏效。这可能吗?
当前回答
If we were to compare context vs. template tags on a single variable, then knowing the more efficient option could be benificial. However, you might be better off to dip into the settings only from templates that need that variable. In that case it doesn't make sense to pass the variable into all templates. But if you are sending the variable into a common template such as the base.html template, Then it would not matter as the base.html template is rendered on every request, so you can use either methods.
如果您决定使用template tags选项，那么使用下面的代码，因为它允许您传入一个默认值，以防有问题的变量未定义。
例如:get_from_settings my_variable as my_context_value
例如:get_from_settings my_variable my_default as my_context_value
class SettingsAttrNode(Node):
def __init__(self, variable, default, as_value):
self.variable = getattr(settings, variable, default)
self.cxtname = as_value
def render(self, context):
context[self.cxtname] = self.variable
return ''
def get_from_setting(parser, token):
as_value = variable = default = ''
bits = token.contents.split()
if len(bits) == 4 and bits[2] == 'as':
variable = bits[1]
as_value = bits[3]
elif len(bits) == 5 and bits[3] == 'as':
variable = bits[1]
default = bits[2]
as_value = bits[4]
else:
raise TemplateSyntaxError, "usage: get_from_settings variable default as value " \
"OR: get_from_settings variable as value"
return SettingsAttrNode(variable=variable, default=default, as_value=as_value)
get_from_setting = register.tag(get_from_setting)
其他回答
我稍微改进了chrisdew的答案(创建自己的标签)。
首先，创建文件yourapp/templatetags/value_from_settings.py，在其中定义你自己的新标签value_from_settings:
from django.template import TemplateSyntaxError, Variable, Node, Variable, Library
from yourapp import settings
register = Library()
# I found some tricks in URLNode and url from defaulttags.py:
# https://code.djangoproject.com/browser/django/trunk/django/template/defaulttags.py
@register.tag
def value_from_settings(parser, token):
bits = token.split_contents()
if len(bits) < 2:
raise TemplateSyntaxError("'%s' takes at least one " \
"argument (settings constant to retrieve)" % bits[0])
settingsvar = bits[1]
settingsvar = settingsvar[1:-1] if settingsvar[0] == '"' else settingsvar
asvar = None
bits = bits[2:]
if len(bits) >= 2 and bits[-2] == 'as':
asvar = bits[-1]
bits = bits[:-2]
if len(bits):
raise TemplateSyntaxError("'value_from_settings' didn't recognise " \
"the arguments '%s'" % ", ".join(bits))
return ValueFromSettings(settingsvar, asvar)
class ValueFromSettings(Node):
def __init__(self, settingsvar, asvar):
self.arg = Variable(settingsvar)
self.asvar = asvar
def render(self, context):
ret_val = getattr(settings,str(self.arg))
if self.asvar:
context[self.asvar] = ret_val
return ''
else:
return ret_val
你可以通过以下方式在模板中使用这个标签:
{% load value_from_settings %}
[...]
{% value_from_settings "FQDN" %}
或通过
{% load value_from_settings %}
[...]
{% value_from_settings "FQDN" as my_fqdn %}
as的优点是…这使得它很容易通过一个简单的{{my_fqdn}}在blocktrans块中使用。
一个更完整的实现。
/项目/ settings.py
APP_NAME = 'APP'
- app - templatetags settings_value . py
from django import template
from django.conf import settings
register = template.Library()
@register.simple_tag
def settings_value(name):
return getattr(settings, name, "")
/app/templates/index.html
<!DOCTYPE html>
{% load static %}
{% load settings_value %}
<head>
<title>{% settings_value "APP_NAME" %}</title>
...
另一种方法是创建一个自定义模板标签，它可以让您从设置中获取值。
@register.tag
def value_from_settings(parser, token):
try:
# split_contents() knows not to split quoted strings.
tag_name, var = token.split_contents()
except ValueError:
raise template.TemplateSyntaxError, "%r tag requires a single argument" % token.contents.split()[0]
return ValueFromSettings(var)
class ValueFromSettings(template.Node):
def __init__(self, var):
self.arg = template.Variable(var)
def render(self, context):
return settings.__getattr__(str(self.arg))
然后你可以使用:
{% value_from_settings "FQDN" %}
将它打印在任何页面上，而无需跳过上下文处理器的约束。
Django提供了对模板中某些常用的设置常量的访问，比如settings。MEDIA_URL和一些语言设置，如果你使用django内置的通用视图或在render_to_response快捷函数中传入context实例关键字参数。以下是每种情况的示例:
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.views.generic.simple import direct_to_template
def my_generic_view(request, template='my_template.html'):
return direct_to_template(request, template)
def more_custom_view(request, template='my_template.html'):
return render_to_response(template, {}, context_instance=RequestContext(request))
这些视图都有一些常用的设置，比如settings。模板可用的MEDIA_URL为{{MEDIA_URL}}，等等。
如果你在设置中寻找对其他常量的访问，那么只需将你想要的常量解包，并将它们添加到你在视图函数中使用的上下文字典中，如下所示:
from django.conf import settings
from django.shortcuts import render_to_response
def my_view_function(request, template='my_template.html'):
context = {'favorite_color': settings.FAVORITE_COLOR}
return render_to_response(template, context)
现在你可以访问设置了。在模板中使用{{FAVORITE_COLOR}}。
上面来自bchhun的例子很好，只是你需要从settings.py显式地构建上下文字典。下面是一个未经测试的示例，说明如何从settings.py的所有大写属性(re: "^[A-Z0-9_]+$")自动构建上下文字典。
在settings.py的末尾:
_context = {}
local_context = locals()
for (k,v) in local_context.items():
if re.search('^[A-Z0-9_]+$',k):
_context[k] = str(v)
def settings_context(context):
return _context
TEMPLATE_CONTEXT_PROCESSORS = (
...
'myproject.settings.settings_context',
...
)
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