Question

我有一个Django项目，我有一个base.html，所有模板都从该继承。然后，在base.html中添加一个category.html文件，这只是我的导航栏。因此，我有一个名为Category的模型，我想将此模型传递给category.html以显示我的类别。我不知道该怎么办？

base.html：

<!DOCTYPE html>
{% load static %}


<html lang="en" style="height: 100%;">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <title>{% block title %}{% endblock %}</title>
    <!-- Google Fonts -->
    {% comment %} <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">    <!-- Bootstrap core CSS --> {% endcomment %}
    <link href="{% static 'fontawesome/css/all.css' %}" rel="stylesheet"> <!--load all styles -->
    <link href="{% static 'css/bootstrap.min.css' %}" rel="stylesheet">
    <!-- Material Design Bootstrap -->
    <link href="{% static 'css/mdb.min.css' %}" rel="stylesheet">
    <!-- Your custom styles (optional) -->
    <link href="{% static 'css/style.min.css' %}" rel="stylesheet">
    <!-- Mega menu style -->
    <link href="{% static 'css/bs4megamenu.css' %}" rel="stylesheet">
    {% block extra_head %}
    {% endblock %}

    {% block slideshow %}
    {% endblock slideshow %}

</head>

<body>

<!-- Category Navbar -->
{% include 'category_navbar.html' %}
<!-- Category Navbar -->

<!-- Body Content -->
{% block content %}{% endblock %}
<!-- Body Content -->



<!-- Footer and scripts-->
{% include 'footer.html' %}
{% include 'scripts.html' %}
<!-- Footer and scripts-->
</body>
</html>

model.py：

class Category(models.Model):
    category_name = models.CharField(max_length=20, default="general")
    category_description = models.TextField()
    category_picture = models.ImageField(upload_to="categories/images/", blank=True)
    slug = models.SlugField()
    parent = models.ForeignKey('self',blank=True, null=True ,related_name='children', on_delete=models.CASCADE)

    class Meta:
        unique_together = ('slug', 'parent',)    #enforcing that there can not be two
        verbose_name_plural = "categories"

    def __str__(self):
        full_path = [self.category_name]
        k = self.parent                          

        while k is not None:
            full_path.append(k.category_name)
            k = k.parent

        return ' -> '.join(full_path[::-1])

    def save(self, *args, **kwargs):
        self.slug = slugify(self.category_name)
        super(Category, self).save(*args, **kwargs)

Answer 1

正如丹尼尔·罗斯曼（Daniel Roseman）所说，创建一个自定义模板标签或上下文处理器。

创建自定义模板标签时，有两种方法：

创建一个添加上下文变量的模板标记，并在.SelectionChanged中使用它。
创建一个包含标记，并使用它代替category_navbar.html

这是第二种方法的样子：

{% include 'category_navbar.html' %}

将其放置在名为例如的文件中您的一个应用的from django import template register = template.Library() @register.inclusion_tag('category_navbar.html', takes_context=True) def category_navbar(parent_context): context = {"categories": Category.objects.all()} context.update(parent_context) # Only necessary if you need any other context variables in `category_navbar.html` return context目录中的nav_tags.py。然后在您的基本模板中：

templatetags

Answer 2

您可以使用上下文处理器：在settings.py

duration_to_wait = 2 # in MINUTES

while True:

    for index in df.index:

        if df.loc[index,'Time flag'] == 1 and df.loc[df.index[index], "Last_email_sent"] == None:
            send_email(index)
            df.loc[df.index[index], "Last_email_sent"] = datetime.datetime.now()

        elif df.loc[index, 'Time flag'] == 1 and datetime.datetime.now() - df.loc[df.index[index], "Last_email_sent"] < datetime.timedelta(minutes=duration_to_wait):
            print('Wait')
            print(datetime.datetime.now() - df.loc[df.index[index], "Last_email_sent"])

        elif df.loc[index, 'Time flag'] == 1 and datetime.datetime.now() - df.loc[df.index[index], "Last_email_sent"] >= datetime.timedelta(minutes=duration_to_wait):
            send_email(index)
            df.loc[index, "Last_email_sent"] = datetime.datetime.now()

        else:
            print('false')

    time.sleep(10)

创建一个名为TEMPLATES = [ { ... 'OPTIONS': { 'context_processors': [ ... 'myproject.context_processors.get_categories', ], }, }, ]的文件（在这种情况下，位于context_processors.py目录中）

myproject

现在，您可以在所有模板中访问def get_categories(request): return {'categories': Category.objects.all()}。 categories

如何将模型传递给所有模板都从base.html扩展的base.html

2 个答案: