django之搜索引擎功能实现

docker image pull delron/elasticsearch-ik:2.4.6-1.0

# network.host: 172.18.168.123
network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
http.port: 9200

docker run -dti --network=host --name=elasticsearch -v /home/pyvip/elasticsearch/config:/usr/share/elasticsearch/config delron/elasticsearch-ik:2.4.6-1.0

# 如果容器不稳定切换这条命令创建容器
docker run -dti --name=elasticsearch -p 9200:9200 delron/elasticsearch-ik:2.4.6-1.0

# 进入项目虚拟环境
workon dj31_env

# 如果安装报错，先初始化  pip3 install setuptools_scm

pip3 install django-haystack
pip3 install elasticsearch==2.4.1

INSTALLED_APPS = [
    ‘haystack‘,
]

# Haystack
HAYSTACK_CONNECTIONS = {
    ‘default‘: {
        ‘ENGINE‘: ‘haystack.backends.elasticsearch_backend.ElasticsearchSearchEngine‘,
        ‘URL‘: ‘http://192.168.216.137:9200/‘,  # 此处为elasticsearch运行的服务器ip地址，端口号默认为9200
        ‘INDEX_NAME‘: ‘site‘,  # 指定elasticsearch建立的索引库的名称
    },
}

# 设置每页显示的数据量
HAYSTACK_SEARCH_RESULTS_PER_PAGE = 5
# 当数据库改变时，会自动更新索引
HAYSTACK_SIGNAL_PROCESSOR = ‘haystack.signals.RealtimeSignalProcessor‘

# 在apps/news/search_indexes.py中创建如下类：（名称固定为search_indexes.py）

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
-------------------------------------------------

-------------------------------------------------
"""

from haystack import indexes
# from haystack import site

from .models import News


class NewsIndex(indexes.SearchIndex, indexes.Indexable):
    """
    News索引数据模型类
    可以借用 hay_stack 借助 ES 来查询
    """
    #  主要进行关键字查询
    text = indexes.CharField(document=True, use_template=True)
    id = indexes.IntegerField(model_attr=‘id‘)
    title = indexes.CharField(model_attr=‘title‘)
    digest = indexes.CharField(model_attr=‘digest‘)
    content = indexes.CharField(model_attr=‘content‘)
    image_url = indexes.CharField(model_attr=‘image_url‘)

    def get_model(self):
        """返回建立索引的模型类
        """
        return News

    def index_queryset(self, using=None):
        """返回要建立索引的数据查询集
        """

        return self.get_model().objects.filter(is_delete=False)

# 创建templates/search/indexes/news/news_text.txt文件（文件名为：模型_text.txt）
# 此模板指明当将关键词通过text参数名传递时，可以通过news 的title、digest、content 来进行关键字索引查询

{{ object.title }}
{{ object.digest }}
{{ object.content }}

# 在虚拟机中执行如下命令，生成索引

python manage.py rebuild_index


// es建立索引：
curl -XPUT ‘http://47.98.147.102:9200/索引名称‘

// 查询当个索引内容：
curl -XGET ‘http://47.98.147.102:9200/dj31_db2/_search?pretty=true‘

// 查询所有索引
curl -XGET ‘http://47.98.147.102:9200/_cat/indices?v‘

# 后台业务逻辑实现
from haystack.views import SearchView


class Search(SearchView):
　　# 必须要指定模板，用户覆盖默认的search/search.html
    template = ‘news/search.html‘

    def create_response(self):
        # 接收前台用户输入的查询值
        # kw=‘python‘
        query = self.request.GET.get(‘q‘,‘‘)
        if not query:
            show = True
            host_news = models.HotNews.objects.select_related(‘news‘).only(‘news_id‘,‘news__title‘,‘news__image_url‘).filter(is_delete=False).order_by(‘priority‘)
            paginator = Paginator(host_news,5)
            try:
                page = paginator.page(int(self.request.GET.get(‘page‘,1)))
            # 假如传的不是整数
            except PageNotAnInteger:
                # 默认返回第一页
                page = paginator.page(1)

            except EmptyPage:
                page = paginator.page(paginator.num_pages)
            return render(self.request,self.template,locals())
        else:
            show=False
            return super().create_response()

# 路由
# 在apps/news/urls.py中

urlpatterns = [
    path(‘search/‘, views.Search(), name=‘search‘),

]

# 自定义分页过滤器
# 在news app下面新建 templatetags / news_template.py

from django import template

register = template.Library()

@register.filter()
def page_bar(page):
    page_list = []
    # 左边
    if page.number !=1:
        page_list.append(1)
    if page.number -3 >1:
        page_list.append(‘...‘)
    if page.number -2 >1:
        page_list.append(page.number -2)
    if page.number - 1>1:
        page_list.append(page.number-1)

    page_list.append(page.number)
    # 右边
    if page.paginator.num_pages >page.number + 1:
        page_list.append(page.number+1)

    if page.paginator.num_pages >page.number+2:
        page_list.append(page.number+2)
    if page.paginator.num_pages > page.number+3:
        page_list.append(‘...‘)
    if page.paginator.num_pages != page.number:
        page_list.append(page.paginator.num_pages)
    return page_list

{% extends ‘base/base.html‘ %}
{% block title %}搜索{% endblock %}
{% load news_template %}
{% block link %}
    <link rel="stylesheet" href="../../static/css/news/search.css">

{% endblock %}

{% block main_contain %}
      <div class="main-contain ">
                   <!-- search-box start -->
                   <div class="search-box">
                       <form action="" style="display: inline-flex;">

                           <input type="search" placeholder="请输入要搜索的内容" name="q" class="search-control">


                           <input type="submit" value="搜索" class="search-btn">
                       </form>
                       <!-- 可以用浮动 垂直对齐 以及 flex  -->
                   </div>
                   <!-- search-box end -->
                   <!-- content start -->
                   <div class="content">
                   {% if not show %}
                       <!-- search-list start -->
{#                        {% if not show_all %}#}
                          <div class="search-result-list">
                            <h2 class="search-result-title">
                              搜索结果 <span style="font-weight: 700;color: #ff6620;">{{ paginator.num_pages }}</span>页
                            </h2>
                            <ul class="news-list">
                              {# 导入自带高亮功能 #}
　　　　　　　　　　　　　　　　　　{# haystack自带highlight标签，将搜索关键字标为高亮 #}
                              {% load highlight %}
                              {% for one_news in page.object_list %}
                                <li class="news-item clearfix">
                                  <a href="{% url ‘news:news_detail‘ one_news.id %}" class="news-thumbnail" target="_blank">
                                  <img src="{{ one_news.object.image_url }}">
                                  </a>
                                  <div class="news-content">
                                    <h4 class="news-title">
                                      <a href="{% url ‘news:news_detail‘ one_news.id %}">
　　　　　　　　　　　　　　　　　　　　　　　　{# 必须使用{% model_name.field_name with query %}#}

                                        {% highlight one_news.title with query %}
                                      </a>
                                    </h4>
                                    <p class="news-details">{{ one_news.digest }}</p>
                                    <div class="news-other">
                                      <span class="news-type">{{ one_news.object.tag.name }}</span>
                                      <span class="news-time">{{ one_news.object.update_time }}</span>
                                      <span
                                          class="news-author">{% highlight one_news.object.author.username with query %}

                                      </span>
                                    </div>
                                  </div>
                                </li>
                              {% endfor %}


                            </ul>
                          </div>

                        {% else %}

                          <div class="news-contain">
                            <div class="hot-recommend-list">
                              <h2 class="hot-recommend-title">热门推荐</h2>
                              <ul class="news-list">

                                {% for one_hotnews in page.object_list %}

                                  <li class="news-item clearfix">
                                    <a href="#" class="news-thumbnail">
                                      <img src="{{ one_hotnews.news.image_url }}">
                                    </a>
                                    <div class="news-content">
                                      <h4 class="news-title">
                                        <a href="{% url ‘news:news_detail‘ one_hotnews.news.id %}">{{ one_hotnews.news.title }}</a>
                                      </h4>
                                      <p class="news-details">{{ one_hotnews.news.digest }}</p>
                                      <div class="news-other">
                                        <span class="news-type">{{ one_hotnews.news.tag.name }}</span>
                                        <span class="news-time">{{ one_hotnews.update_time }}</span>
                                        <span class="news-author">{{ one_hotnews.news.author.username }}</span>
                                      </div>
                                    </div>
                                  </li>

                                {% endfor %}


                              </ul>
                            </div>
                          </div>

                        {% endif %}

                       <!-- search-list end -->
                       <!-- news-contain start -->

                    {# 分页导航 #}
                     <div class="page-box" id="pages">
                       <div class="pagebar" id="pageBar">
                          <a class="a1">{{ page.paginator.count | default:0 }}条</a>
{#                          上一页的URL地址#}
                         {% if page.has_previous %}
                           {% if query %}
                             <a href="{% url ‘news:search‘ %}?q={{ query }}&amp;page={{ page.previous_page_number }}&q={{ query }}"
                                class="prev">上一页</a>
                           {% else %}
                             <a href="{% url ‘news:search‘ %}?page={{ page.previous_page_number }}" class="prev">上一页</a>
                           {% endif %}
                         {% endif %}


{#                          列出所有的URL地址 页码#}
                       {% if page.has_previous or page.has_next %}

                        {% for n in page|page_bar %}
                            {% if query %}
                                {% if n == ‘...‘ %}
                                    <span class="point">{{ n }}</span>
                                {% else %}
                                    {% if n == page.number %}
                                        <span class="sel">{{ n }}</span>
                                    {% else %}
                                        <a href="{% url ‘news:search‘ %}?page={{ n }}&q={{ query }}">{{ n }}</a>
                                    {% endif %}
                                {% endif %}
                            {% else %}
                                {% if n == ‘...‘ %}
                                    <span class="point">{{ n }}</span>
                                {% else %}
                                    {% if n == page.number %}
                                        <span class="sel">{{ n }}</span>
                                    {% else %}
                                        <a href="{% url ‘news:search‘ %}?page={{ n }}">{{ n }}</a>
                                    {% endif %}
                                {% endif %}
                            {% endif %}
                        {% endfor %}
                    {% endif %}

{#                       next_page 下一页的URL地址#}
                         {% if page.has_next %}
                           {% if query %}
                             <a href="{% url ‘news:search‘ %}?q={{ query }}&amp;page={{ page.next_page_number }}&q={{ query }}"
                                class="next">下一页</a>
                           {% else %}
                             <a href="{% url ‘news:search‘ %}?page={{ page.next_page_number }}" class="next">下一页</a>
                           {% endif %}
                         {% endif %}
                       </div>
                     </div>
                     <!-- news-contain end -->
                   </div>
                   <!-- content end -->
               </div>

{% endblock %}


{% block script %}
{% endblock %}

/* 在static/css/news/search.css中加入如下代码： */

/* === current index start === */
#pages {
    padding: 32px 0 10px;
}

.page-box {
    text-align: center;
    /*font-size: 14px;*/
}

#pages a.prev, a.next {
    width: 56px;
    padding: 0
}

#pages a {
    display: inline-block;
    height: 26px;
    line-height: 26px;
    background: #fff;
    border: 1px solid #e3e3e3;
    text-align: center;
    color: #333;
    padding: 0 10px
}

#pages .sel {
    display: inline-block;
    height: 26px;
    line-height: 26px;
    background: #0093E9;
    border: 1px solid #0093E9;
    color: #fff;
    text-align: center;
    padding: 0 10px
}
/* === current index end === */