Learnings

<p>Query Expressions are amazing </p>

<p>Use a custom loaddata management command to load data from stdin to production Django projects. Useful for loading data into Heroku: </p>

<p>If you're using <code>CELERY_ALWAYS_EAGER = True</code>, probably you'll also want <code>CELERY_EAGER_PROPAGATES_EXCEPTIONS = True</code> to find bugs</p>

<p>Django bugfix release: 1.10.5 - update your projects! </p>

<p>On Django templates, avoid nested <code>for</code>s on simple cases by using <code>ifchanged</code> block tag: #ifchanged</p>

<p>On Django, validate ZIP codes, states, social security numbers and more with django-localflavor: </p>

<p>Use Hashids to generate short obfuscated strings from IDs. Useful for URL shorteners and human friendly IDs: </p>

<p>On a Django test, get the HTML content of an e-mail with <code>content, mimetype = mail.outbox[0].alternatives[0]</code></p>

<p>Testing image upload in Django Rest Framework: </p>

<p>Speed up your Django automated tests with <code>python manage.py test --keepdb --parallel</code></p>

<p>While developing, do <code>python manage.py --keepdb</code> to speed up your Django tests. This prevents the overhead of creating and destroying a new test DB</p>

<p>Django-solo helps working with singletons: </p>

<p>You can pass a <code>update_fields</code> param to the model <code>save</code> method. One interesting use for this is to avoid updating dates in time stamped models.</p> <p><code>product.name = 'Name changed again' product.save(update_fields=['name'])</code></p> <p><a href="#specifying-which-fields-to-save">#specifying-which-fields-to-save</a></p>

<p>Use <code>subTest</code> in Python unittest when asserting inside loop: <a href="#.425k66c9b">#.425k66c9b</a></p>

<p>On Django, access form error codes in the template use the <code>as_data</code> attribute like this: <code>{% for error in form.errors.as_data %}{% endfor %}</code> </p>