Django实现组合搜索的方法示例

Posted 2021-03-20 carlos-li

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一、实现方法

1.纯模板语言实现

2.自定义simpletag实现（本质是简化了纯模板语言的判断）

二、基本原理

原理都是通过django路由系统，匹配url筛选条件，将筛选条件作为数据库查询结果，返回给前端。

例如：路由系统中的url格式是这样：

url(r‘^article-(?P<article_type_id>d+)-(?P<category_id>d+).html‘,views.filter)

其中article_type_id和category_id和数据库中字段是相对应的，此时当一个url为article-1-2.html时候，后台处理函数的参数将是一个字典{‘article_type_id‘: 1, ‘category_id‘: 1}，然后将该条件作为数据库查询条件，最后得出结果返回给前端

三、代码样例

方法1：纯模板语言实现

urls.py

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

from django.conf.urls import url
 
from . import views
urlpatterns = [
  url(r‘^$‘,views.index),
  url(r‘^article-(?P<article_type_id>d+)-(?P<category_id>d+).html‘,views.filter),
]

models.py

from django.db import models
 
class Category(models.Model):
  caption=models.CharField(max_length=64)
 
class Article_type(models.Model):
  caption=models.CharField(max_length=64)
 
class Article(models.Model):
  title=models.CharField(max_length=64)
  content=models.CharField(max_length=256)
  category=models.ForeignKey(to=‘Category‘)
  article_type=models.ForeignKey(to=‘Article_type‘

views.py

def filter(request,*args,**kwargs):
  if request.method=="GET":
    condition={}
    for k,v in kwargs.items():
          kwargs[k]=int(v) 　　#模板if判断row.id是数字，所以这里需要转换
          if v=="0":　　　　　　#当条件为0代表所选的是全部，那么就不必要加入到过滤条件中
            pass
          else:
            condition[k]=int(v)
    aritcle=models.Article.objects.filter(**condition)
    aritcle_type=models.Article_type.objects.all()
    aritcle_category=models.Category.objects.all()
    return render(request,‘search.html‘,{
      ‘aritcle‘:aritcle,
      ‘article_type‘:aritcle_type,
      ‘article_category‘:aritcle_category,
      ‘article_arg‘:kwargs,　　#将当前的筛选条件传递给html
    })

html模板

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .container a{
      display: inline-block;
      padding: 3px 5px;
      margin: 5px;
      border: 1px solid #dddddd ;
    }
    .active{
      background-color: rebeccapurple;
 
    }
  </style>
</head>
<body>
<h1>搜索条件</h1>
<div class="container">
  {% if article_arg.article_type_id == 0 %}
    <a class="active" href="/cmdb/article-0-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >全部</a>
  {% else %}
     <a href="/cmdb/article-0-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >全部</a>
  {% endif %}
  {% for row in article_type %}
    {% if row.id == article_arg.article_type_id %}
      <a class="active" href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% else %}
      <a href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% endif %}
  {% endfor %}
</div>
<div class="container">
   {% if article_arg.category_id == 0 %}
    <a class="active" href="/cmdb/article-{{ article_arg.article_type_id }}-0.html" rel="external nofollow" rel="external nofollow" >全部</a>
  {% else %}
     <a href="/cmdb/article-{{ article_arg.article_type_id }}-0.html" rel="external nofollow" rel="external nofollow" >全部</a>
  {% endif %}
  {% for row in article_category %}
    {% if row.id == article_arg.category_id %}
    <a class="active" href="/cmdb/article-{{ article_arg.article_type_id }}-{{ row.id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% else %}
    <a href="/cmdb/article-{{ article_arg.article_type_id }}-{{ row.id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% endif %}
  {% endfor %}
</div>
<h1>查询结果</h1>
<div>
  {% for row in aritcle %}
    <div>{{ row.id }}-{{ row.title }}</div>
  {% endfor %}
</div>
</body>
</html>

方法二：使用simpletag实现

定义simpletag

myfilter.py

#!/usr/bin/env python3
#_*_ coding:utf-8 _*_
#Author:wd
from django import template
from django.utils.safestring import mark_safe
 
register=template.Library()
@register.simple_tag
def filter_all(article_arg,condition):
  ‘‘‘
  处理条件为全部
  :param article_arg: 当前url字典：如{‘article_type_id‘: 1, ‘category_id‘: 1}
  :param condition: 要处理的条件，如article_type_id，用于区分当前处理选择了那个全部
  :return: 返回下面页面形式
  {% if article_arg.article_type_id == 0 %}
    <a class="active" href="/cmdb/article-0-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >全部</a>
  {% else %}
     <a href="/cmdb/article-0-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >全部</a>
  {% endif %}
  {% for row in article_type %}
    {% if row.id == article_arg.article_type_id %}
      <a class="active" href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% else %}
      <a href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% endif %}
  {% endfor %}
  ‘‘‘
  if condition==‘article_type_id‘:
    if article_arg[condition]==0:
      print(article_arg[‘category_id‘])
      res= ‘<a class ="active" href="/cmdb/article-0-%s.html" rel="external nofollow" rel="external nofollow" >全部</a>‘ % article_arg[‘category_id‘]
    else:
      res = ‘<a href="/cmdb/article-0-%s.html" rel="external nofollow" rel="external nofollow" >全部</a>‘ % article_arg[‘category_id‘]
    return mark_safe(res)
  elif condition==‘category_id‘:
    if article_arg[‘category_id‘]==0:
      res = ‘<a class ="active" href="/cmdb/article-%s-0.html" rel="external nofollow" rel="external nofollow" >全部</a>‘ % article_arg[‘article_type_id‘]
    else:
      res = ‘<a href="/cmdb/article-%s-0.html" rel="external nofollow" rel="external nofollow" >全部</a>‘ % article_arg[‘article_type_id‘]
    return mark_safe(res)
 
@register.simple_tag
def filter_type(article_type,article_arg):
  ‘‘‘
  :param article_type: article_type对象
  :param article_arg: 当前url字典
  :return: 
  {% for row in article_type %}
    {% if row.id == article_arg.article_type_id %}
      <a class="active" href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% else %}
      <a href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% endif %}
  {% endfor %}
   ‘‘‘
  res=[]
  for row in article_type:
    if row.id== article_arg[‘article_type_id‘]:
      temp=‘<a class="active" href="/cmdb/article-%s-%s.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s</a>‘ %(row.id,article_arg[‘category_id‘],row.caption)
    else:
      temp = ‘<a href="/cmdb/article-%s-%s.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s</a>‘ % (row.id, article_arg[‘category_id‘],row.caption)
    res.append(temp)
  return mark_safe("".join(res))
 
@register.simple_tag
def filter_category(article_category,article_arg):
  ‘‘‘
  :param article_type: article_category对象
  :param article_arg: 当前url字典
  :return: 
  {% for row in article_category %}
    {% if row.id == article_arg.category_id %}
    <a class="active" href="/cmdb/article-{{ article_arg.article_type_id }}-{{ row.id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% else %}
    <a href="/cmdb/article-{{ article_arg.article_type_id }}-{{ row.id }}.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ row.caption }}</a>
    {% endif %}
  {% endfor %}
   ‘‘‘
  res=[]
  for row in article_category:
    if row.id== article_arg[‘category_id‘]:
      temp=‘<a class="active" href="/cmdb/article-%s-%s.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s</a>‘ %(article_arg[‘article_type_id‘],row.id,row.caption)
    else:
      temp = ‘<a href="/cmdb/article-%s-%s.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s</a>‘ % (article_arg[‘article_type_id‘],row.id,row.caption)
    res.append(temp)
  return mark_safe("".join(res))

html模板

{% load myfilter %}
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .container a{
      display: inline-block;
      padding: 3px 5px;
      margin: 5px;
      border: 1px solid #dddddd ;
    }
    .active{
      background-color: rebeccapurple;
 
    }
  </style>
</head>
<body>
<h1>搜索条件</h1>
<div class="container">
  {% filter_all article_arg ‘article_type_id‘ %}
  {% filter_type article_type article_arg %}
</div>
<div class="container">
  {% filter_all article_arg ‘category_id‘ %}
  {% filter_category article_category article_arg %}
</div>
<h1>查询结果</h1>
<div>
  {% for row in aritcle %}
    <div>{{ row.id }}-{{ row.title }}</div>
  {% endfor %}
</div>
</body>
</html>

ps附上简图：

技术图片

四、其他变化

在如上的示例中，我们的过滤条件是从数据库中拿到，有时候我们定义的时候使用的是静态字段，此时组合搜索会稍微修改。

1.model定义

class Article(models.Model):
  title=models.CharField(max_length=64)
  content=models.CharField(max_length=256)
  category=models.ForeignKey(to=‘Category‘)
  article_type=(  #使用静态字段放入内存
    (1,‘linux‘),
    (2,‘python‘),
    (3,‘go‘),
  )

2.处理函数变化

###获取####
aritcle_type=models.Article.article_type#直接获取类的静态字段

3.simpletag相应改变

###由于我们传递的元祖，所以取值使用元祖方式
article_type[0]# 筛选条件id
article_type[1]# 筛选条件名称

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Django实现组合搜索的方法示例

目录

一、实现方法

二、基本原理

三、代码样例

方法二：使用simpletag实现

四、其他变化