-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathdjango-validators.html
More file actions
211 lines (175 loc) · 12.3 KB
/
django-validators.html
File metadata and controls
211 lines (175 loc) · 12.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
<!DOCTYPE html>
<!--[if IEMobile 7 ]><html class="no-js iem7"><![endif]-->
<!--[if lt IE 9]><html class="no-js lte-ie8"><![endif]-->
<!--[if (gt IE 8)|(gt IEMobile 7)|!(IEMobile)|!(IE)]><!--><html class="no-js" lang="en"><!--<![endif]-->
<head>
<link rel="short icon" href="http://softing.qiniudn.com/20140603011448867_easyicon_net_128.ico" type="image/x-ico">
<meta charset="utf-8">
<title>Django Validators</title>
<meta name="author" content="tulpar">
<!-- http://t.co/dKP3o1e -->
<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- <link href="/favicon.png" rel="icon"> -->
<link href="/theme/css/main.css" media="screen, projection"
rel="stylesheet" type="text/css">
<script src="/theme/js/modernizr-2.0.js"></script>
<script src="/theme/js/ender.js"></script>
<script src="/theme/js/octopress.js" type="text/javascript"></script>
<link href="http://fonts.googleapis.com/css?family=PT+Serif:regular,italic,bold,bolditalic"
rel="stylesheet" type="text/css">
<link href="http://fonts.googleapis.com/css?family=PT+Sans:regular,italic,bold,bolditalic"
rel="stylesheet" type="text/css">
</head>
<body>
<header role="banner"><hgroup>
<h1><a href="/">Dreaming</a></h1>
</hgroup></header>
<nav role="navigation"><ul class="subscription" data-subscription="rss">
</ul>
<ul class="main-navigation">
<li class="active">
<a href="/category/it.html">It</a>
</li>
<li >
<a href="/category/life.html">Life</a>
</li>
</ul></nav>
<div id="main">
<div id="content">
<div>
<article class="hentry" role="article">
<header>
<h1 class="entry-title">Django Validators</h1>
<p class="meta"><time datetime="2014-09-07T00:00:00+08:00" pubdate>Sun 07 September 2014</time></p>
</header>
<div class="entry-content"><p>之前没用过Validators <br />
这回入了门，用了一下，很爽～～ </p>
<hr />
<p><a href="https://docs.djangoproject.com/en/dev/ref/validators/">Django Validators</a> </p>
<h5>正如django文档所说：我们可以自己新建各种Validators，如：</h5>
<div class="highlight"><pre><span class="n">from</span> <span class="n">django</span><span class="p">.</span><span class="n">core</span><span class="p">.</span><span class="n">exceptions</span> <span class="n">import</span> <span class="n">ValidationError</span>
<span class="n">def</span> <span class="n">validate_even</span><span class="p">(</span><span class="n">value</span><span class="p">)</span><span class="o">:</span>
<span class="k">if</span> <span class="n">value</span> <span class="o">%</span> <span class="mi">2</span> <span class="o">!=</span> <span class="mi">0</span><span class="o">:</span>
<span class="n">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="err">'</span><span class="o">%</span><span class="n">s</span> <span class="n">is</span> <span class="n">not</span> <span class="n">an</span> <span class="n">even</span> <span class="n">number</span><span class="err">'</span> <span class="o">%</span> <span class="n">value</span><span class="p">)</span>
</pre></div>
<p>You can add this to a model field via the field’s validators argument: </p>
<div class="highlight"><pre><span class="n">from</span> <span class="n">django</span><span class="p">.</span><span class="n">db</span> <span class="n">import</span> <span class="n">models</span>
<span class="n">class</span> <span class="n">MyModel</span><span class="p">(</span><span class="n">models</span><span class="p">.</span><span class="n">Model</span><span class="p">)</span><span class="o">:</span>
<span class="n">even_field</span> <span class="o">=</span> <span class="n">models</span><span class="p">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">validators</span><span class="o">=</span><span class="p">[</span><span class="n">validate_even</span><span class="p">])</span>
</pre></div>
<p>神奇点在于，django自动帮我们抓取‘值’当作参数传入我们的Validators（有点像让人讨厌的黑魔术，但不是～～） </p>
<h5>同一个Validators也可以用于form，因为model和form相应的机理是一样的</h5>
<div class="highlight"><pre><span class="n">from</span> <span class="n">django</span> <span class="n">import</span> <span class="n">forms</span>
<span class="n">class</span> <span class="n">MyForm</span><span class="p">(</span><span class="n">forms</span><span class="p">.</span><span class="n">Form</span><span class="p">)</span><span class="o">:</span>
<span class="n">even_field</span> <span class="o">=</span> <span class="n">forms</span><span class="p">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">validators</span><span class="o">=</span><span class="p">[</span><span class="n">validate_even</span><span class="p">])</span>
</pre></div>
<h3>不过，多数时候我们喜欢用内置的Validators，也就是官网说的<code>Built-in validators</code></h3>
<p>用法如下:</p>
<div class="highlight"><pre><span class="n">from</span> <span class="n">django</span><span class="p">.</span><span class="n">core</span><span class="p">.</span><span class="n">validators</span> <span class="n">import</span> <span class="n">MinLengthValidator</span>
<span class="n">from</span> <span class="n">django</span><span class="p">.</span><span class="n">db</span> <span class="n">import</span> <span class="n">models</span>
<span class="n">class</span> <span class="n">MyModel</span><span class="p">(</span><span class="n">models</span><span class="p">.</span><span class="n">Model</span><span class="p">)</span><span class="o">:</span>
<span class="n">even_field</span> <span class="o">=</span> <span class="n">models</span><span class="p">.</span><span class="n">TextField</span><span class="p">(</span><span class="n">validators</span><span class="o">=</span><span class="p">[</span><span class="n">MinLengthValidator</span><span class="p">(</span><span class="mi">20</span><span class="p">)])</span>
</pre></div>
<p>以上所用<code>MinLengthValidator</code>网名生意：<code>max_length</code>的反意思。 <br />
还有很多内置Validator，<a href="https://docs.djangoproject.com/en/dev/ref/validators/">看官网</a></p>
<h3>假如我想改一下内置 Validator的错误提示，可以这么干：</h3>
<p>1.自己写一个子类，覆盖message</p>
<div class="highlight"><pre><span class="n">from</span> <span class="n">django</span><span class="p">.</span><span class="n">core</span><span class="p">.</span><span class="n">validators</span> <span class="n">import</span> <span class="n">MinLengthValidator</span>
<span class="n">from</span> <span class="n">django</span><span class="p">.</span><span class="n">db</span> <span class="n">import</span> <span class="n">models</span>
<span class="n">class</span> <span class="n">MyMinLengthValidator</span><span class="p">(</span><span class="n">MinLengthValidator</span><span class="p">)</span><span class="o">:</span>
<span class="n">message</span> <span class="o">=</span> <span class="s">"少年， 至少输入%(limit_value)d个字符 ，(你怎么只输入 %(show_value)d个字符就完事儿啊)."</span>
<span class="n">class</span> <span class="n">MyModel</span><span class="p">(</span><span class="n">models</span><span class="p">.</span><span class="n">Model</span><span class="p">)</span><span class="o">:</span>
<span class="n">even_field</span> <span class="o">=</span> <span class="n">models</span><span class="p">.</span><span class="n">TextField</span><span class="p">(</span><span class="n">validators</span><span class="o">=</span><span class="p">[</span><span class="n">MinLengthValidator</span><span class="p">(</span><span class="mi">20</span><span class="p">)])</span>
</pre></div>
<ol>
<li>当然，这种方法很简单，很常见，不够高大上：填写<code>error_messages</code>选项</li>
</ol>
<div class="highlight"><pre><span class="p">....</span>
<span class="n">my_field</span> <span class="o">=</span> <span class="n">forms</span><span class="p">.</span><span class="n">CharField</span><span class="p">(</span><span class="n">validators</span><span class="o">=</span><span class="p">[</span><span class="n">MinLengthValidator</span><span class="p">(</span><span class="mi">8</span><span class="p">)],</span>
<span class="n">error_messages</span><span class="o">=</span><span class="p">{</span><span class="s">"min_length"</span><span class="o">:</span><span class="s">"少年， 至少输入%(limit_value)d个字符 ，(你怎么只输入 %(show_value)d个字符就完事儿啊)."</span><span class="p">})</span>
<span class="p">})</span>
<span class="p">..</span> <span class="p">.</span> <span class="p">..</span>
</pre></div></div>
<footer>
<p class="meta">
<span class="byline author vcard">
Posted by <span class="fn">tulpar</span>
</span>
<time datetime="2014-09-07T00:00:00+08:00" pubdate>Sun 07 September 2014</time> <span class="categories">
<a class="category" href="/tag/django.html">Django</a>
</span>
</p><div class="sharing">
</div> </footer>
</article>
<!-- Duoshuo Comment BEGIN -->
<div class="ds-thread"></div>
<script type="text/javascript">
var duoshuoQuery = {short_name:"tlbog"};
(function() {
var ds = document.createElement('script');
ds.type = 'text/javascript';ds.async = true;
ds.src = 'http://static.duoshuo.com/embed.js';
ds.charset = 'UTF-8';
(document.getElementsByTagName('head')[0]
|| document.getElementsByTagName('body')[0]).appendChild(ds);
})();
</script>
<!-- Duoshuo Comment END -->
</div>
<aside class="sidebar">
<section>
<h1>Recent Posts</h1>
<ul id="recent_posts">
<li class="post">
<a href="/xie-bo-ke-jiao-ben.html">写博客脚本</a>
</li>
<li class="post">
<a href="/gong-zuo-shi-de-sui-bi.html">工作时的随笔</a>
</li>
<li class="post">
<a href="/ce-shi-wen-zhang.html">测试文章</a>
</li>
<li class="post">
<a href="/djangokai-qi-the-sites-framework.html">Django开启 the sites framework</a>
</li>
<li class="post">
<a href="/django-17shi-yong.html">Django 1.7试用</a>
</li>
</ul>
</section>
<section>
<h1>Categories</h1>
<ul id="recent_posts">
<li><a href="/category/it.html">It</a></li>
<li><a href="/category/life.html">Life</a></li>
</ul>
</section>
<section>
<h1>Tags</h1>
<a href="/tag/mysql.html">Mysql</a>, <a href="/tag/tmux.html">Tmux</a>, <a href="/tag/fan-qiang.html">翻墙</a>, <a href="/tag/linux.html">Linux</a>, <a href="/tag/edx.html">Edx</a>, <a href="/tag/virtualbox.html">VirtualBox</a>, <a href="/tag/wo-ai-wo-jia.html">我爱我家</a>, <a href="/tag/userena.html">userena</a>, <a href="/tag/xadmin.html">Xadmin</a>, <a href="/tag/shell.html">Shell</a>, <a href="/tag/python.html">Python</a>, <a href="/tag/djangopython.html">Django，python</a>, <a href="/tag/ssh.html">ssh</a>, <a href="/tag/ubuntu.html">Ubuntu</a>, <a href="/tag/git.html">Git</a>, <a href="/tag/ce-shi.html">测试</a>, <a href="/tag/ueditor.html">Ueditor</a>, <a href="/tag/github.html">Github</a>, <a href="/tag/socketio.html">Socket.io</a>, <a href="/tag/django.html">Django</a>, <a href="/tag/du-shu.html">读书</a>, <a href="/tag/bo-ke.html">博客</a>, <a href="/tag/ngrok.html">ngrok</a> </section>
<section>
<h1>Social</h1>
<ul>
<li><a href="http://izda.com" target="_blank">ئىزدە</a></li>
<li><a href="http://www.google.com" target="_blank">Google</a></li>
<li><a href="http://www.zhihu.com/" target="_blank">知乎</a></li>
<li><a href="http://www.douban.com/" target="_blank">豆瓣</a></li>
</ul>
</section>
<section>
<h1>Blogroll</h1>
<ul>
<li><a href="https://github.com/tulpar008" target="_blank">My Github</a></li>
<li><a href="#" target="_blank">tulpar008@gmail.com</a></li>
</ul>
</section>
</aside> </div>
</div>
<footer role="contentinfo"><p>
Copyright © 2013-2015 - tulpar -
<span class="credit">Powered by <a href="http://getpelican.com">Pelican</a></span>
</p></footer>
</body>
</html>