python&django 实现页面中关联查询小功能（基础篇）

时间：2023-05-13 21:26:20

效果

实现效果图如下，根据过滤条件查询相关信息。

python&django 实现页面中关联查询小功能（基础篇）

知识点

1.配置URL，在路由中使用正则表达式

2.过滤查询

代码

setting.py

 from django.contrib import admin

 from django.urls import path,re_path,include

 from app01 import views

 urlpatterns = [

     path('admin/', admin.site.urls),

     path('article-(\d+)-(\d+).html', views.article),

     re_path(r'article-(?P<article_type_id>\d+)-(?P<category_id>\d+).html', views.article,name="article"), #正则过滤

 ]

models.py

 from django.db import models

 # Create your models here.

 class Category(models.Model):

     caption = models.CharField(max_length=16)

 class ArticleType(models.Model):

     caption = models.CharField(max_length=16)

 class Article(models.Model):

     title = models.CharField(max_length=32)

     content = models.CharField(max_length=255)

     category = models.ForeignKey(Category,on_delete=models.CASCADE)

     article_type = models.ForeignKey(ArticleType,on_delete=models.CASCADE)

view.py

 from django.shortcuts import render

 from app01 import models

 # Create your views here.

 def article(request,*args,**kwargs):

     print(kwargs) # 打印所有参数

     contition = {} # 定义一个空集合，接收参数

     for k,v in kwargs.items():

         kwargs[k] = int(v) # 由于参数类型都为str类型，所以该处进行转换

         if v == '':

             pass

         else:

             contition[k] = v # 当参数为非0时 进行接收

     print(args)

     article_type_list = models.ArticleType.objects.all()

     category_list = models.Category.objects.all()

     result = models.Article.objects.filter(**contition) # 过滤查询

     return  render(request,

                    "article.html",

                    {

                        'result':result,

                        'article_type_list':article_type_list,

                        'category_list':category_list,

                        'arg_dict':kwargs,

                    }

                    )

article.html

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>Title</title>

     <style>

         .condition a{

             display:inline-block;;

             padding: 3px 5px;

             border:1px solid #dddddd;

             margin:5px 5px;

         }

          .condition a.active{

             background-color: darkgreen;

         }

     </style>

 </head>

 <body>

 <h1>过滤条件</h1>

 <div class="condition">

     {% if arg_dict.article_type_id == 0 %}

          <a  class="active" href="/article-0-{{ arg_dict.category_id }}.html">全部</a>

     {% else %}

          <a href="/article-0-{{ arg_dict.category_id }}.html">全部</a>

     {% endif %}

     {% for row in article_type_list %}

         {% if row.id == arg_dict.article_type_id %}

         <a  class="active"  href="/article-{{ row.id }}-{{ arg_dict.category_id }}.html">{{ row.caption }}</a>

         {% else %}

         <a href="/article-{{ row.id }}-{{ arg_dict.category_id }}.html">{{ row.caption }}</a>

         {% endif %}

     {% endfor %}

 </div>

 <div class="condition">

     {% if arg_dict.category_id == 0 %}

         <a class="active" href="/article-{{ arg_dict.article_type_id }}-0.html">全部</a>

     {% else %}

         <a href="/article-{{ arg_dict.article_type_id }}-0.html">全部</a>

     {% endif %}

     {% for row in category_list %}

         {% if row.id == arg_dict.category_id %}

             <a class="active" href="/article-{{ arg_dict.article_type_id }}-{{ row.id }}.html">{{ row.caption }}</a>

         {% else %}

             <a href="/article-{{ arg_dict.article_type_id }}-{{ row.id }}.html">{{ row.caption }}</a>

         {% endif %}

     {% endfor %}

 </div>

 <h1>查询结果</h1>

 <ul>

 {% for row in result %}

     <li>{{ row.id }}-{{ row.title }}</li>

 {% endfor %}

 </ul>

 </body>

 </html>

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