Django - 简单的自定义模板标签示例 [英] Django - Simple custom template tag example

问题描述

我有用户、视频、主题、标准和评分

• 视频有一个主题
• 一个主题有条件
• 用户可以为给定的主题创建视频
• 用户可以根据针对相关主题的每个标准对视频进行评分.

你可以看到我的原帖 Django - Rating Model Example DetailView Template获取所用模型的详细信息

我已经扩展了一个基于 video 模型的 DetailView 模板来放置所选视频的评分列表em> 对于给定的 user 作为额外的上下文.

class VideoFileDetailView(DetailView):模型 = 视频文件def get_context_data(self, **kwargs):context = super(VideoFileDetailView, self).get_context_data(**kwargs)context['rates'] = VideoRate.objects.filter(video=self.object, user=self.request.user)返回上下文

在DetailView指向的模板中，我想列出视频的标准，以及每个标准显示用户的当前评分值.

<ul>{% for crit in videofile.topic.crits.all %}<li>{% for rate in rate %}{% if rate.crit.id == crit.id %}{{rate.rate}}{％ 万一 ％}{% 结束为 %}<div class="rateit"data-rateit-value="{# 评分值 #}"data-rateit-ispreset="true"crit-id="{{ crit.id }}"></div>{{ 暴击 }}{% 结束为 %}

(rateit 是一个 jquery 插件，我用来绘制漂亮的星星评分控件)

实际上，我在第二个 for 中获得了我的评分值，但我确信有更好的方法来做到这一点.事实上，我仍然不确定我的模型是否正确.>

最后，我想将 {# The rating value #} 替换为当前暴击(在循环中)的 rate 的评级值.我该怎么做?

解决方案

这是我的解决方案(基于自定义标签):

首先创建文件结构.进入需要标签的应用目录，并添加以下文件:

模板标签模板标签/__init__.py模板标签/video_tags.py

templatetags/video_tags.py 文件:

from django 导入模板注册 = 模板.图书馆()@register.simple_tagdef get_rate(暴击率，率):退货率.get(crit=crit).rate

模板部分，带有我们的标签调用:

{% 加载 video_tags %}<div id="评级"><ul>{% for crit in videofile.topic.crits.all %}<li><div class="rateit"data-rateit-value="{% get_rate 暴击率 %}"data-rateit-ispreset="true"crit-id="{{ crit.id }}"></div>{{ 暴击 }}{% 结束为 %}

I have users, videos, topics, criterias and ratings

• A video has a topic
• A topic has criterias
• A user can create a video for a given topic
• A user can rate a video on each criterias given for the concerned topic.

You can see my original post Django - Rating Model Example DetailView Template to get details on the model used

I have extended a DetailView template based on the video model to put the list of ratings for the selected video for a given user as extra context.

class VideoFileDetailView(DetailView):
  model = VideoFile

  def get_context_data(self, **kwargs):
    context = super(VideoFileDetailView, self).get_context_data(**kwargs)
    context['rates'] = VideoRate.objects.filter(video=self.object, user=self.request.user)
    return context

In the template pointed by the DetailView, I'd like to list the criterias of the video, and for each criteria display the current rating value form the user.

<div id="rating">
  <ul>
{% for crit in videofile.topic.crits.all %}
    <li>
  {% for rate in rates %}
    {% if rate.crit.id == crit.id %}
      {{ rate.rate }}
    {% endif %}
  {% endfor %}
      <div class="rateit"
        data-rateit-value="{# The rating value #}"
        data-rateit-ispreset="true"
        crit-id="{{ crit.id }}"></div>
      {{ crit }}
    </li>
{% endfor %}
  </ul>
</div>

(rateit is a jquery plugin that I use to draw pretty stars rating controls)

Actually I get my rating values here within the 2nd for but I'm sure there is a better way to do that. In fact, I'm still not sure about my model correctness.

Finally I'd like to replace {# The rating value #} by the rating value from rate for the current crit (in the loop). How can I do that ?

解决方案

Here is my solution (based on a custom tag):

Firstly create the file structure. Go into the app directory where the tag is needed, and add these files:

templatetags
templatetags/__init__.py
templatetags/video_tags.py

The templatetags/video_tags.py file:

from django import template

register = template.Library()

@register.simple_tag
def get_rate(crit, rates):
    return rates.get(crit=crit).rate

The template part, with our tag call:

{% load video_tags %}

<div id="rating">
  <ul>
{% for crit in videofile.topic.crits.all %}
    <li>
      <div class="rateit"
        data-rateit-value="{% get_rate crit rates %}"
        data-rateit-ispreset="true"
        crit-id="{{ crit.id }}"></div>
      {{ crit }}
    </li>
{% endfor %}
  </ul>
</div>

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