-
Notifications
You must be signed in to change notification settings - Fork 0
/
django-multiple-forms-in-one-class-based-view.html
338 lines (280 loc) · 23.4 KB
/
django-multiple-forms-in-one-class-based-view.html
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="author" content="Thomas Loiret">
<meta name="description" content="How to fit several forms in one view ?">
<meta name="fediverse:creator" content="@[email protected]">
<meta name="google-site-verification" content="jZBc2U9MHiBnSlgpoFEed-V3PZ16pMNv0GSX4hOh4mg" />
<title>Django: multiple forms in one class based view - Thomas Loiret - Random thoughts</title>
<!-- Custom styles for this template -->
<!-- build:css stylesheets/main.css -->
<link rel="stylesheet" href="https://b0uh.github.io/theme/css/main.min.css">
<link rel="stylesheet" href="https://b0uh.github.io/theme/css/custom.min.css">
<link rel="stylesheet" href="https://b0uh.github.io/theme/css/pygments/autumn.min.css">
<!-- endbuild -->
<link href="https://b0uh.github.io/feeds/all.atom.xml" type="application/atom+xml" rel="alternate" title="Thomas Loiret - Random thoughts Atom Feed" />
<!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
<![endif]-->
<!-- Google Fonts -->
<script type="text/javascript">
WebFontConfig = {
google: { families: [ 'Open+Sans:300,400,700:latin', 'Lato:700,900:latin' ] }
};
(function() {
var wf = document.createElement('script');
wf.src = ('https:' == document.location.protocol ? 'https' : 'http') +
'://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';
wf.type = 'text/javascript';
wf.async = 'true';
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(wf, s);
})();
</script>
</head>
<body>
<!-- header -->
<header class="header push-down-45">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#readable-navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<nav class="navbar navbar-default" role="navigation">
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="readable-navbar-collapse">
<ul class="navigation">
<li>
<a href="https://b0uh.github.io">Home</a>
</li>
<li>
<a href="https://b0uh.github.io/pages/about.html">About</a>
</li>
<li>
<a href="https://b0uh.github.io/pages/bookmarks.html">Bookmarks</a>
</li>
<li>
<a href="https://b0uh.github.io/archives.html">Archives</a>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</nav>
<div class="hidden-xs hidden-sm">
<div class="social">
<a href="#" class="search__container">
<span class="glyphicon glyphicon-flash"></span>
</a>
<ul class="social__dropdown">
<li>
<a href="https://b0uh.github.io/feeds/all.atom.xml" target="_blank" class="social__container">
<span class="zocial-rss"></span>
</a>
</li>
<li>
<a href="https://mamot.fr/@b0uh" rel="me" target="_blank" class="social__container">
<img src="https://b0uh.github.io/theme/images/icons/mastodon-25px.png" />
</a>
</li>
<li>
<a href="https://www.linkedin.com/in/thomasloiret/" target="_blank" class="social__container">
<span class="zocial-linkedin"></span>
</a>
</li>
<li>
<a href="https://www.last.fm/user/b0uh" target="_blank" class="social__container">
<span class="zocial-lastfm"></span>
</a>
</li>
</ul>
</div>
</div>
</div>
</header>
<div class="container">
<div itemscope itemtype="http://schema.org/Article" class="boxed push-down-60">
<!-- Start of the blogpost -->
<div class="row">
<div class="col-xs-10 col-xs-offset-1 col-md-8 col-md-offset-2 push-down-60">
<!-- Start of the content -->
<div class="post-content">
<h1 itemprop="name">Django: multiple forms in one class based view</h1>
<div class="meta__container--without-image">
<div class="row">
<div class="col-xs-12 col-sm-8">
<span itemprop="author" itemscope itemtype="http://schema.org/Person">
<div class="meta__info" itemprop="name">
Thomas Loiret
</div>
</span>
</div>
<div class="col-xs-12 col-sm-4">
<div class="meta__comments">
<span class="meta__date" itemprop="datePublished" content="2017-08-01">
<span class="glyphicon glyphicon-calendar"></span> Tue 01 August 2017
</span>
</div>
</div>
</div>
</div>
<span itemprop="articleBody">
<h2>Context</h2>
<p>Let's say we want to rebuild Stackoverflow and especially the page of a question. On this page you can either post a response or a comment, so here classic class based views are not enough. We will focus on those two forms (response and comment) for the example bellow.</p>
<h3>Constraints</h3>
<ul>
<li>Staying on the same URL after submitting a form</li>
<li>Forms cannot be submitted at the same time</li>
<li>Using a class based view style because it seems more readable in my opinion</li>
</ul>
<h2>forms.py</h2>
<div class="highlight"><pre><span></span><code><span class="kn">from</span><span class="w"> </span><span class="nn">django</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">forms</span>
<span class="k">class</span><span class="w"> </span><span class="nc">ResponseForm</span><span class="p">(</span><span class="n">forms</span><span class="o">.</span><span class="n">Form</span><span class="p">):</span>
<span class="w"> </span><span class="n">content</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">forms</span><span class="o">.</span><span class="n">CharField</span><span class="p">()</span>
<span class="k">class</span><span class="w"> </span><span class="nc">CommentForm</span><span class="p">(</span><span class="n">forms</span><span class="o">.</span><span class="n">Form</span><span class="p">):</span>
<span class="w"> </span><span class="n">content</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">forms</span><span class="o">.</span><span class="n">CharField</span><span class="p">()</span>
</code></pre></div>
<h2>urls.py</h2>
<div class="highlight"><pre><span></span><code><span class="kn">from</span><span class="w"> </span><span class="nn">django.conf.urls</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">url</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">my_app.views</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">QuestionDetail</span>
<span class="n">urlpatterns</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="n">url</span><span class="p">(</span><span class="sa">r</span><span class="s2">"^detail/(?P<pk>\w+)/$"</span><span class="p">,</span><span class="w"> </span><span class="n">QuestionDetail</span><span class="o">.</span><span class="n">as_view</span><span class="p">()),</span>
<span class="p">]</span>
</code></pre></div>
<h2>views.py</h2>
<div class="highlight"><pre><span></span><code><span class="kn">from</span><span class="w"> </span><span class="nn">django.contrib.auth.mixins</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">LoginRequiredMixin</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">django.http</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">Http404</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">django.shortcuts</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">render</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">django.views.generic</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">View</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">my_app.forms</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">CommentForm</span><span class="p">,</span><span class="w"> </span><span class="n">ResponseForm</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">my_app.models</span><span class="w"> </span><span class="kn">import</span><span class="w"> </span><span class="n">Question</span>
<span class="k">class</span><span class="w"> </span><span class="nc">QuestionDetail</span><span class="p">(</span><span class="n">LoginRequiredMixin</span><span class="p">,</span><span class="w"> </span><span class="n">View</span><span class="p">):</span>
<span class="w"> </span><span class="n">template_name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'my_app/question_detail.html'</span>
<span class="w"> </span><span class="k">def</span><span class="w"> </span><span class="nf">get_object</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="w"> </span><span class="k">try</span><span class="p">:</span>
<span class="w"> </span><span class="n">obj</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Question</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">pk</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">kwargs</span><span class="p">[</span><span class="s1">'pk'</span><span class="p">])</span>
<span class="w"> </span><span class="k">except</span><span class="w"> </span><span class="n">Question</span><span class="o">.</span><span class="n">DoesNotExist</span><span class="p">:</span>
<span class="w"> </span><span class="k">raise</span><span class="w"> </span><span class="n">Http404</span><span class="p">(</span><span class="s1">'Question not found!'</span><span class="p">)</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">obj</span>
<span class="w"> </span><span class="k">def</span><span class="w"> </span><span class="nf">get_context_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="w"> </span><span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="w"> </span><span class="n">kwargs</span><span class="p">[</span><span class="s1">'question'</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="bp">self</span><span class="o">.</span><span class="n">get_object</span><span class="p">()</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="s1">'response_form'</span><span class="w"> </span><span class="ow">not</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="n">kwargs</span><span class="p">:</span>
<span class="w"> </span><span class="n">kwargs</span><span class="p">[</span><span class="s1">'response_form'</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ResponseForm</span><span class="p">()</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="s1">'comment_form'</span><span class="w"> </span><span class="ow">not</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="n">kwargs</span><span class="p">:</span>
<span class="w"> </span><span class="n">kwargs</span><span class="p">[</span><span class="s1">'comment_form'</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">CommentForm</span><span class="p">()</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">kwargs</span>
<span class="w"> </span><span class="k">def</span><span class="w"> </span><span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="w"> </span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="o">*</span><span class="n">args</span><span class="p">,</span><span class="w"> </span><span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">render</span><span class="p">(</span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="bp">self</span><span class="o">.</span><span class="n">template_name</span><span class="p">,</span><span class="w"> </span><span class="bp">self</span><span class="o">.</span><span class="n">get_context_data</span><span class="p">())</span>
<span class="w"> </span><span class="k">def</span><span class="w"> </span><span class="nf">post</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="w"> </span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="o">*</span><span class="n">args</span><span class="p">,</span><span class="w"> </span><span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="w"> </span><span class="n">ctxt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{}</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="s1">'response'</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="n">request</span><span class="o">.</span><span class="n">POST</span><span class="p">:</span>
<span class="w"> </span><span class="n">response_form</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ResponseForm</span><span class="p">(</span><span class="n">request</span><span class="o">.</span><span class="n">POST</span><span class="p">)</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">response_form</span><span class="o">.</span><span class="n">is_valid</span><span class="p">():</span>
<span class="w"> </span><span class="c1"># Here, save the response</span>
<span class="w"> </span><span class="k">else</span><span class="p">:</span>
<span class="w"> </span><span class="n">ctxt</span><span class="p">[</span><span class="s1">'response_form'</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">response_form</span>
<span class="w"> </span><span class="k">elif</span><span class="w"> </span><span class="s1">'comment'</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="n">request</span><span class="o">.</span><span class="n">POST</span><span class="p">:</span>
<span class="w"> </span><span class="n">comment_form</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">CommentForm</span><span class="p">(</span><span class="n">request</span><span class="o">.</span><span class="n">POST</span><span class="p">)</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">comment_form</span><span class="o">.</span><span class="n">is_valid</span><span class="p">():</span>
<span class="w"> </span><span class="c1"># Here, save the comment</span>
<span class="w"> </span><span class="k">else</span><span class="p">:</span>
<span class="w"> </span><span class="n">ctxt</span><span class="p">[</span><span class="s1">'comment_form'</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">comment_form</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">render</span><span class="p">(</span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="bp">self</span><span class="o">.</span><span class="n">template_name</span><span class="p">,</span><span class="w"> </span><span class="bp">self</span><span class="o">.</span><span class="n">get_context_data</span><span class="p">(</span><span class="o">**</span><span class="n">ctxt</span><span class="p">))</span>
</code></pre></div>
<p>Here the view inherit from <a href="https://docs.djangoproject.com/en/1.11/ref/class-based-views/base/#django.views.generic.base.View"><code>View</code></a> in order to keep a class based view style. All methods here has been inspired by other CBV like <a href="https://docs.djangoproject.com/en/1.11/ref/class-based-views/generic-editing/#django.views.generic.edit.UpdateView"><code>UpdateView</code></a>.</p>
<h2>question_detail.html</h2>
<div class="highlight"><pre><span></span><code><span class="nt"><fieldset></span>
<span class="w"> </span><span class="nt"><legend></span>Answer<span class="w"> </span>the<span class="w"> </span>question<span class="nt"></legend></span>
<span class="w"> </span><span class="nt"><form</span><span class="w"> </span><span class="na">method=</span><span class="s">"post"</span><span class="nt">></span>
<span class="w"> </span><span class="cp">{%</span> <span class="k">csrf_token</span> <span class="cp">%}</span>
<span class="w"> </span><span class="cp">{{</span> <span class="nv">response_form</span> <span class="cp">}}</span>
<span class="w"> </span><span class="nt"><input</span><span class="w"> </span><span class="na">name=</span><span class="s">"response"</span><span class="w"> </span><span class="na">type=</span><span class="s">"submit"</span><span class="w"> </span><span class="na">value=</span><span class="s">"Submit"</span><span class="w"> </span><span class="nt">/></span>
<span class="w"> </span><span class="nt"></form></span>
<span class="nt"></fieldset></span>
<span class="nt"><fieldset></span>
<span class="w"> </span><span class="nt"><legend></span>Add<span class="w"> </span>a<span class="w"> </span>comment<span class="nt"></legend></span>
<span class="w"> </span><span class="nt"><form</span><span class="w"> </span><span class="na">method=</span><span class="s">"post"</span><span class="nt">></span>
<span class="w"> </span><span class="cp">{%</span> <span class="k">csrf_token</span> <span class="cp">%}</span>
<span class="w"> </span><span class="cp">{{</span> <span class="nv">comment_form</span> <span class="cp">}}</span>
<span class="w"> </span><span class="nt"><input</span><span class="w"> </span><span class="na">name=</span><span class="s">"comment"</span><span class="w"> </span><span class="na">type=</span><span class="s">"submit"</span><span class="w"> </span><span class="na">value=</span><span class="s">"Submit"</span><span class="w"> </span><span class="nt">/></span>
<span class="w"> </span><span class="nt"></form></span>
<span class="nt"></fieldset></span>
</code></pre></div>
<p>For each form, in the template the should name the submit button in order to know in the view which form has been submitted.</p>
<h2>Inspirations</h2>
<p>While looking for a solution to handle multiple forms in one view I found these posts whose inspired me:</p>
<ul>
<li><a href="http://anothercomputingblog.blogspot.fr/2010/04/multiple-django-forms-on-same-view.html">Multiple Django forms in the same view</a> (How to know which form has been submitted)</li>
<li><a href="https://chriskief.com/2012/12/30/django-class-based-views-with-multiple-forms/">Django Class-based Views with Multiple Forms</a> (Tweak <code>UpdateView</code> in order the handle multiple forms)</li>
<li><a href="http://www.joshuakehn.com/2013/7/18/multiple-django-forms-in-one-form.html">Using Multiple Django Forms On One Page</a> (Talks about saving several forms in one shot)</li>
<li><a href="https://krzysztofzuraw.com/blog/2016/two-forms-one-view-django.html">Two forms one view in django</a> (Use multiple views to handle multiple forms, interesting approach)</li>
</ul>
</span>
<div class="meta__container--without-image">
<div class="row">
</div>
</div>
<br>
</div>
</div>
</div>
</div>
</div>
<footer class="copyrights">
<div class="container">
<div class="row">
<div class="col-xs-12 col-sm-6">
Powered by <a href="https://github.com/getpelican/pelican">Pelican</a>.
</div>
<div class="col-xs-12 col-sm-6">
<div class="copyrights--right">
Made with <span class="glyphicon glyphicon-heart"></span> in Nantes.
</div>
</div>
</div>
</div>
</footer>
<script src="https://b0uh.github.io/theme/scripts/jquery.min.js"></script>
<script src="https://b0uh.github.io/theme/scripts/underscore.min.js"></script>
<script src="https://b0uh.github.io/theme/scripts/bootstrap.min.js"></script>
<script src="https://b0uh.github.io/theme/scripts/main.min.js"></script>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-98369697-1', 'auto');
ga('send', 'pageview');
</script>
<!-- Chiffre.io - Privacy-first analytics -->
<script id="chiffre:analytics-config" type="application/json">
{
"publicKey": "pk.VvetZOQ0g5XwOL2W6hVvG7gFQTk3xdUMczDkqSCZUxE",
"pushURL": "https://push.chiffre.io/event/ceJKfYgcLN6XkYn8"
}
</script>
<script
src="https://embed.chiffre.io/analytics.js"
crossorigin="anonymous"
async=""
>
</script>
<noscript>
<img
src="https://push.chiffre.io/noscript/ceJKfYgcLN6XkYn8"
alt="Chiffre.io anonymous visit counting for clients without JavaScript"
crossorigin="anonymous"
width="1px"
height="1px"
style="display:none"
/>
</noscript>
</body>
</html>