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Django - Tutorial 042. Caching templates for different types of content

templatetags, template, Django

In Django - Lesson 035. Different templates for rendering different types of content in search results it was shown how to render different templates depending on what type of content drawn in the search results on the site. In this case, the key point was that it was not necessary to make the verification conditions for the selection of the template. The information about the balbalon was stored in the variable TEMPLATE_PREVIEW, through which the template was inserted into the include tag in the Django template.

{% include object.TEMPLATE_PREVIEW %}

In this method there is one big drawback. The fact is that the include tag with each of its calls is looking for a template. With a large load on the site - this can significantly increase the duration of the response from the server. To solve this problem, you need to somehow cache the pattern. Since different types of content use different templates, to do this using inclusion_tag is quite problematic.

This problem was solved by caching the template at the class level as a class variable.

This mechanism can be implemented using a mixin.

class EInterfaceMixin:
    TEMPLATE_FULL = 'full.html'     # путь к шаблону
    template_full = None            # pattern caching variable

    # we will cache with the help of the class method, in which we pass the object for rendering, as well as the context of the request
    # request context is required to provide rendering functionality that is dependent on the current user
    @classmethod
    def __render_template_full(cls, obj, request_context):
        if not cls.template_full:
            cls.template_full = loader.get_template(cls.TEMPLATE_FULL)
        return cls.template_full.render({'object': obj, 'user': request_context['user']})

    # method to render using context
    def render_template_full(self, request_context):
        return self.__render_template_full(self, request_context)

Next you need to register the built-in tag. This is necessary so that when rendering in a template, pick up the context of the request. In my case, part of the templates can not be correctly displayed without information about the current user who is on the site.

@register.simple_tag(takes_context=True)
def render_template_full(context, obj):
    if obj:
        return obj.render_template_full(context)
    return ''

Use in template

{% load render_template_full from core %}
{% for object in object_list %}
    {% render_template_full object %}
{% empty %}

Conclusion

This mixin can be added to all models that will use this rendering engine.

The first time the class method is called, the template will be cached. In subsequent render calls, the already cached template will be used. Thus, there will be no useless CPU time spent on searching for a template with each call of the include tag

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Comments

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ПМ
March 18, 2019, 3:12 p.m.
Пётр Махнёв

C ++ - Test 004. Pointers, Arrays and Loops

  • Result:50points,
  • Rating points-4
ЯГ
March 18, 2019, 7:59 a.m.
Ян Греку

C++ - Тест 003. Условия и циклы

  • Result:21points,
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МД
March 15, 2019, 4:32 p.m.
Михаил Дементьев

C++ - Test 001. The first program and data types

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Last comments
March 16, 2019, 1:55 p.m.
Дмитрий

Спасибо за статью. Давно итересует следующий вопрос: с помощью переменных QMAKE_TARGET_COMPANYQMAKE_TARGET_PRODUCTQMAKE_TARGET_DESCRIPTIONможно задать свойства компилируемой программы, о...
JS
March 12, 2019, 10:19 a.m.
Jean Stefanovich

Большое спасибо за разъяснения!
March 12, 2019, 10:04 a.m.
Евгений Легоцкой

Hello, In fact, this functionality or is not implemented, or is not documented. I'm not sure. But I think, that it should be implemented in Text QML Type. Because of we can write text in...
March 12, 2019, 9:51 a.m.
Евгений Легоцкой

Да вы правы. На самом деле проще через QSqlQueryModel, сколько не пытался использовать эти дженерики типо QSqlTableModel и QSqlRelationalTableModel, то всегда упирался в какие-то их ограничени...
JS
March 12, 2019, 9:47 a.m.
Jean Stefanovich

Единицы измерения лежат там же где и названия продуктов. Просто в таблице ингредиенты нет ещё одного столбца, на который можно было бы установить setRelation. Я в итоге в базе создал ещё один ...
Now discuss on the forum
March 17, 2019, 10:47 p.m.
Евгений Легоцкой

Добрый день. Вот, нашлось у меня немного времени. Делается это через шаблон проектирования наблюдатель. GraphKS_mfvSlup.zip
ЧГ
March 15, 2019, 9:52 p.m.
Чарльз Грин

спасибо, попробую, отпишусь
m
March 15, 2019, 7:41 p.m.
mihamuz

Сори догадался)
n
March 12, 2019, 4:57 p.m.
newbie.works.with.QT

Большооооое спасибо!!!!!Не передать как я вам благодарен, спасибо что всегда отзываетесь.Теперь я смогу продолжить работу в QT!!! (пробую писать бота (Я как вы могли догадаться немного не пр...
March 12, 2019, 1:20 p.m.
BlinCT

Ну так если у вас есть готовая программа так ей и воспользуйтесь. Вы же написали ее вот и пользуйтесь.
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