Django - 如何使变量可用于所有模板? [英] Django - How to make a variable available to all templates?

问题描述

我想知道如何将变量传递给我的所有模板，而不在我的 views.py 文件中的每个方法上重复相同的代码?

I would like to know how to pass a variable to all my templates, without repeating the same code on every method in my views.py file?

在下面的示例中，我想让类别(类别对象的数组)可用于网络应用程序中的所有模板.

In the example below I would like to make categories (an array of category objects) available to all templates in the web app.

Eg: I would like to avoid writing 'categories':categories on every method. Is it possible?

一种查看方法

def front_page(request):
    categories = Category.objects.all()
    if is_logged_in(request) is False:
        return render_to_response('users/signup.html', {'is_logged_in': is_logged_in(request), 'categories':categories}, context_instance=RequestContext(request))
    else:
        return render_to_response('users/front_page.html', {'is_logged_in': is_logged_in(request), 'categories':categories},context_instance=RequestContext(request))

另一种查看方法

def another_view_method(request):
    categories = Category.objects.all()
    return render_to_response('eg/front_page.html', {'is_logged_in': is_logged_in(request), 'categories':categories},context_instance=RequestContext(request))

推荐答案

你想要的是一个上下文处理器，而且很容易创建一个.假设您有一个名为 custom_app 的应用，请按照以下步骤操作:

What you want is a context processor, and it's very easy to create one. Assuming you have an app named custom_app, follow the next steps:

• 将 custom_app 添加到 settings.py 中的 INSTALLED_APPS(您已经完成了，对吧?)；
• 在custom_app文件夹中创建一个context_processors.py；

• 将以下代码添加到该新文件中:

• Add custom_app to INSTALLED_APPS in settings.py (you've done it already, right?);
• Create a context_processors.py into custom_app folder;

• Add the following code to that new file:

def categories_processor(request):
 categories = Category.objects.all()            
 return {'categories': categories}

将 context_processors.py 添加到 settings.py

TEMPLATE_CONTEXT_PROCESSORS += ("custom_app.context_processors.categories_processor", )

现在你可以在所有模板中使用 {{categories}} :D

And now you can use {{categories}} in all the templates :D

从 Django 1.8 开始

要添加TEMPLATE_CONTEXT_PROCESSORS，您必须在设置中添加下一个代码:

To add a TEMPLATE_CONTEXT_PROCESSORS, in the settings you must add the next code:

TEMPLATES[0]['OPTIONS']['context_processors'].append("custom_app.context_processors.categories_processor")

或者将该字符串直接包含在 TEMPLATES 设置中的 OPTIONS.context_processors 键中.

Or include that string directly in the OPTIONS.context_processors key in your TEMPLATES setting.

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