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POdjango Piston Post Request Change strings to lists
 

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    <p>I have a simple Django-Piston Handler that creates a new instance of a model and saves it.</p> <p>From the client, I am posting using Javascript Objects and JQuery.post.</p> <p>Upon inspecting the data with Firebug, the post string looks like this:</p> <pre><code>classification=&amp;organization=&amp;title=Formatting+Test+7&amp;description=test&amp;created_by=created_on=&amp;last_modified=&amp;csrfmiddlewaretoken=a8352bb51f88c271119a81228a5c291f </code></pre> <p>As you can see, only title, description, and csrfmiddlewaretoken are set.</p> <p>Inside the Piston Handler, at the top of the create method before any other code is run, I print out the request.POST:</p> <pre><code>print 'POST:', request.POST </code></pre> <p>Which prints the following in the Django Dev Server output:</p> <pre><code>POST: &lt;QueryDict: {u'description': [u'test'], u'classification': [u''], u'title': [u'Formatting Test 7'], u'created_by': [u''], u'created_on': [u''], u'last_modified': [u''], u'organization': [u''], u'csrfmiddlewaretoken': [u'a8352bb51f88c271119a81228a5c291f']}&gt; </code></pre> <p>As you can see, all of the data is in lists now. When I save the data using a Django Form, it converts the list to a string and when the data shows up on the client, instead of "Formatting Test 7", it displays "[u'Formatting Test 7']".</p> <p>Googling doesn't seem to return anyone with the same problem, and I have been using Piston for over 6 months and I have never seen an error like this before.</p> <p><strong>EDIT:</strong> As JPIC said, the error I thought I was experiencing was not an error, but by design. My problem was in extending the data in the QuerySet before I used it with a Django Form.</p> <p><strong>The Wrong Way:</strong> </p> <pre><code>some_initial_data = { 'created_by': creator.pk, 'organization': org.pk, 'classification': 7 } post = dict(request.POST) post.update(some_initial_data) form = MyModelForm(post) </code></pre> <p><strong>The Right Way:</strong> </p> <p>As described in the update method for QueryDict: <a href="https://docs.djangoproject.com/en/1.3/ref/request-response/#querydict-objects" rel="nofollow">https://docs.djangoproject.com/en/1.3/ref/request-response/#querydict-objects</a></p> <pre><code>some_initial_data = { 'created_by': creator.pk, 'organization': org.pk, 'classification': 7 } post = request.POST.copy() post.update(initial_data) form = MyModelForm(post) </code></pre>
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