author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 07 Apr 2009 22:22:43 +0000 | |
changeset 2126 | df06ceda7dcc |
parent 109 | 620f9b141567 |
permissions | -rw-r--r-- |
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Writing your first Django app, part 4 |
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===================================== |
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This tutorial begins where `Tutorial 3`_ left off. We're continuing the Web-poll |
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application and will focus on simple form processing and cutting down our code. |
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Write a simple form |
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=================== |
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Let's update our poll detail template from the last tutorial, so that the |
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template contains an HTML ``<form>`` element:: |
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<h1>{{ poll.question }}</h1> |
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{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %} |
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<form action="/polls/{{ poll.id }}/vote/" method="post"> |
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{% for choice in poll.choice_set.all %} |
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<input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}" /> |
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<label for="choice{{ forloop.counter }}">{{ choice.choice }}</label><br /> |
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{% endfor %} |
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<input type="submit" value="Vote" /> |
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</form> |
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A quick rundown: |
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* The above template displays a radio button for each poll choice. The |
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``value`` of each radio button is the associated poll choice's ID. The |
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``name`` of each radio button is ``"choice"``. That means, when somebody |
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selects one of the radio buttons and submits the form, it'll send the |
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POST data ``choice=3``. This is HTML Forms 101. |
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* We set the form's ``action`` to ``/polls/{{ poll.id }}/vote/``, and we |
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set ``method="post"``. Using ``method="post"`` (as opposed to |
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``method="get"``) is very important, because the act of submitting this |
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form will alter data server-side. Whenever you create a form that alters |
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data server-side, use ``method="post"``. This tip isn't specific to |
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Django; it's just good Web development practice. |
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Now, let's create a Django view that handles the submitted data and does |
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something with it. Remember, in `Tutorial 3`_, we created a URLconf for the |
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polls application that includes this line:: |
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(r'^(?P<poll_id>\d+)/vote/$', 'mysite.polls.views.vote'), |
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So let's create a ``vote()`` function in ``mysite/polls/views.py``:: |
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from django.shortcuts import get_object_or_404, render_to_response |
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from django.http import HttpResponseRedirect |
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from mysite.polls.models import Choice, Poll |
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# ... |
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def vote(request, poll_id): |
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p = get_object_or_404(Poll, pk=poll_id) |
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try: |
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selected_choice = p.choice_set.get(pk=request.POST['choice']) |
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except (KeyError, Choice.DoesNotExist): |
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# Redisplay the poll voting form. |
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return render_to_response('polls/detail.html', { |
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'poll': p, |
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'error_message': "You didn't select a choice.", |
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}) |
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else: |
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selected_choice.votes += 1 |
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selected_choice.save() |
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# Always return an HttpResponseRedirect after successfully dealing |
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# with POST data. This prevents data from being posted twice if a |
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# user hits the Back button. |
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return HttpResponseRedirect('/polls/%s/results/' % p.id) |
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This code includes a few things we haven't covered yet in this tutorial: |
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* ``request.POST`` is a dictionary-like object that lets you access |
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submitted data by key name. In this case, ``request.POST['choice']`` |
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returns the ID of the selected choice, as a string. ``request.POST`` |
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values are always strings. |
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Note that Django also provides ``request.GET`` for accessing GET data |
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in the same way -- but we're explicitly using ``request.POST`` in our |
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code, to ensure that data is only altered via a POST call. |
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* ``request.POST['choice']`` will raise ``KeyError`` if ``choice`` wasn't |
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provided in POST data. The above code checks for ``KeyError`` and |
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redisplays the poll form with an error message if ``choice`` isn't given. |
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* After incrementing the choice count, the code returns an |
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``HttpResponseRedirect`` rather than a normal ``HttpResponse``. |
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``HttpResponseRedirect`` takes a single argument: the URL to which the |
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user will be redirected. You should leave off the "http://" and domain |
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name if you can. That helps your app become portable across domains. |
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As the Python comment above points out, you should always return an |
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``HttpResponseRedirect`` after successfully dealing with POST data. This |
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tip isn't specific to Django; it's just good Web development practice. |
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As mentioned in Tutorial 3, ``request`` is a ``HTTPRequest`` object. For more |
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on ``HTTPRequest`` objects, see the `request and response documentation`_. |
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After somebody votes in a poll, the ``vote()`` view redirects to the results |
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page for the poll. Let's write that view:: |
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def results(request, poll_id): |
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p = get_object_or_404(Poll, pk=poll_id) |
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return render_to_response('polls/results.html', {'poll': p}) |
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This is almost exactly the same as the ``detail()`` view from `Tutorial 3`_. |
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The only difference is the template name. We'll fix this redundancy later. |
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Now, create a ``results.html`` template:: |
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110 |
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<h1>{{ poll.question }}</h1> |
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112 |
|
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113 |
<ul> |
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114 |
{% for choice in poll.choice_set.all %} |
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<li>{{ choice.choice }} -- {{ choice.votes }} vote{{ choice.votes|pluralize }}</li> |
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{% endfor %} |
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</ul> |
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118 |
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Now, go to ``/polls/1/`` in your browser and vote in the poll. You should see a |
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120 |
results page that gets updated each time you vote. If you submit the form |
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without having chosen a choice, you should see the error message. |
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122 |
|
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.. _request and response documentation: ../request_response/ |
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124 |
|
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125 |
Use generic views: Less code is better |
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126 |
====================================== |
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127 |
|
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128 |
The ``detail()`` (from `Tutorial 3`_) and ``results()`` views are stupidly |
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simple -- and, as mentioned above, redundant. The ``index()`` view (also from |
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Tutorial 3), which displays a list of polls, is similar. |
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131 |
|
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These views represent a common case of basic Web development: getting data from |
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133 |
the database according to a parameter passed in the URL, loading a template and |
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returning the rendered template. Because this is so common, Django provides a |
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135 |
shortcut, called the "generic views" system. |
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136 |
|
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Generic views abstract common patterns to the point where you don't even need |
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to write Python code to write an app. |
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139 |
|
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140 |
Let's convert our poll app to use the generic views system, so we can delete a |
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141 |
bunch of our own code. We'll just have to take a few steps to make the |
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142 |
conversion. |
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143 |
|
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144 |
.. admonition:: Why the code-shuffle? |
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145 |
|
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146 |
Generally, when writing a Django app, you'll evaluate whether generic views |
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147 |
are a good fit for your problem, and you'll use them from the beginning, |
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148 |
rather than refactoring your code halfway through. But this tutorial |
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149 |
intentionally has focused on writing the views "the hard way" until now, to |
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150 |
focus on core concepts. |
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151 |
|
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152 |
You should know basic math before you start using a calculator. |
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153 |
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154 |
First, open the polls/urls.py URLconf. It looks like this, according to the |
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155 |
tutorial so far:: |
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156 |
|
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157 |
from django.conf.urls.defaults import * |
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158 |
|
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159 |
urlpatterns = patterns('mysite.polls.views', |
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160 |
(r'^$', 'index'), |
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161 |
(r'^(?P<poll_id>\d+)/$', 'detail'), |
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162 |
(r'^(?P<poll_id>\d+)/results/$', 'results'), |
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(r'^(?P<poll_id>\d+)/vote/$', 'vote'), |
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164 |
) |
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165 |
|
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166 |
Change it like so:: |
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167 |
|
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168 |
from django.conf.urls.defaults import * |
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169 |
from mysite.polls.models import Poll |
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170 |
|
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171 |
info_dict = { |
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172 |
'queryset': Poll.objects.all(), |
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173 |
} |
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174 |
|
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175 |
urlpatterns = patterns('', |
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176 |
(r'^$', 'django.views.generic.list_detail.object_list', info_dict), |
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177 |
(r'^(?P<object_id>\d+)/$', 'django.views.generic.list_detail.object_detail', info_dict), |
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178 |
(r'^(?P<object_id>\d+)/results/$', 'django.views.generic.list_detail.object_detail', dict(info_dict, template_name='polls/results.html')), |
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179 |
(r'^(?P<poll_id>\d+)/vote/$', 'mysite.polls.views.vote'), |
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180 |
) |
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181 |
|
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182 |
We're using two generic views here: ``object_list`` and ``object_detail``. |
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183 |
Respectively, those two views abstract the concepts of "display a list of |
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184 |
objects" and "display a detail page for a particular type of object." |
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185 |
|
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186 |
* Each generic view needs to know what data it will be acting upon. This |
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187 |
data is provided in a dictionary. The ``queryset`` key in this dictionary |
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188 |
points to the list of objects to be manipulated by the generic view. |
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189 |
|
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190 |
* The ``object_detail`` generic view expects the ID value captured |
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191 |
from the URL to be called ``"object_id"``, so we've changed ``poll_id`` to |
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192 |
``object_id`` for the generic views. |
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193 |
|
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194 |
By default, the ``object_detail`` generic view uses a template called |
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195 |
``<app name>/<model name>_detail.html``. In our case, it'll use the template |
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``"polls/poll_detail.html"``. Thus, rename your ``polls/detail.html`` template to |
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197 |
``polls/poll_detail.html``, and change the ``render_to_response()`` line in |
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198 |
``vote()``. |
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199 |
|
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200 |
Similarly, the ``object_list`` generic view uses a template called |
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201 |
``<app name>/<model name>_list.html``. Thus, rename ``polls/index.html`` to |
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202 |
``polls/poll_list.html``. |
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203 |
|
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204 |
Because we have more than one entry in the URLconf that uses ``object_detail`` |
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205 |
for the polls app, we manually specify a template name for the results view: |
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206 |
``template_name='polls/results.html'``. Otherwise, both views would use the same |
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207 |
template. Note that we use ``dict()`` to return an altered dictionary in place. |
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208 |
|
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209 |
.. note:: ``all()`` is lazy |
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210 |
|
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211 |
It might look a little frightening to see ``Poll.objects.all()`` being used |
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212 |
in a detail view which only needs one ``Poll`` object, but don't worry; |
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213 |
``Poll.objects.all()`` is actually a special object called a ``QuerySet``, |
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214 |
which is "lazy" and doesn't hit your database until it absolutely has to. By |
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215 |
the time the database query happens, the ``object_detail`` generic view will |
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216 |
have narrowed its scope down to a single object, so the eventual query will |
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217 |
only select one row from the database. |
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If you'd like to know more about how that works, The Django database API |
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documentation `explains the lazy nature of QuerySet objects`_. |
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.. _explains the lazy nature of QuerySet objects: ../db_api/#querysets-are-lazy |
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In previous parts of the tutorial, the templates have been provided with a context |
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that contains the ``poll`` and ``latest_poll_list`` context variables. However, |
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the generic views provide the variables ``object`` and ``object_list`` as context. |
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Therefore, you need to change your templates to match the new context variables. |
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Go through your templates, and modify any reference to ``latest_poll_list`` to |
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``object_list``, and change any reference to ``poll`` to ``object``. |
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You can now delete the ``index()``, ``detail()`` and ``results()`` views |
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from ``polls/views.py``. We don't need them anymore -- they have been replaced |
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by generic views. |
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The ``vote()`` view is still required. However, it must be modified to match |
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the new templates and context variables. Change the template call from |
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``polls/detail.html`` to ``polls/poll_detail.html``, and pass ``object`` in the |
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context instead of ``poll``. |
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Run the server, and use your new polling app based on generic views. |
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For full details on generic views, see the `generic views documentation`_. |
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.. _generic views documentation: ../generic_views/ |
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Coming soon |
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=========== |
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The tutorial ends here for the time being. But check back soon for the next |
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installments: |
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* Advanced form processing |
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* Using the RSS framework |
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* Using the cache framework |
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* Using the comments framework |
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* Advanced admin features: Permissions |
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* Advanced admin features: Custom JavaScript |
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.. _Tutorial 3: ../tutorial3/ |