Automigrate, autocreatesuperuser if not User.count() in runserver and use manage.py:main as entrypoint

With this awesome manage.py, it will try to migrate first when called with runserver. Also, this manege.py has super power to be used in your entry point as such: entry_points = { 'console_scripts': [ # u haz a setup.py -> u haz importable module :) 'yourcommand = yourproject.manage:main', ], }, Example output: $ yourcommand runserver Operations to perform: Apply all migrations: auth, contenttypes, admin, sessions Running migrations: Rendering model states... DONE Applying contenttypes.0001_initial... OK Applying auth.0001_initial... OK Applying admin.0001_initial... OK Applying admin.0002_logentry_remove_auto_add... OK Applying contenttypes.0002_remove_content_type_name... OK Applying auth.0002_alter_permission_name_max_length... OK Applying auth.0003_alter_user_email_max_length... OK Applying auth.0004_alter_user_username_opts... OK Applying auth.0005_alter_user_last_login_null... OK Applying auth.0006_require_contenttypes_0002... OK Applying auth.0007_alter_validators_add_error_messages... OK Applying sessions.0001_initial... OK Operations to perform: Apply all migrations: admin, auth, contenttypes, sessions Running migrations: No migrations to apply. Performing system checks... Username (leave blank to use 'jpic'): Email address: [email protected] Password: Password (again): Superuser created successfully. Welcome in 2017, where automation is king System check identified no issues (0 silenced). September 17, 2017 - 21:21:41 Django version 1.9.10, using settings 'crudlfap_example.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CONTROL-C. Extra note: it doesn't matter if migrate crashes for now, since django runserver doesn't support not being able to connect to database. So most of the time I hope to shouldn't need to disable this hack.

• django
• manage
• managepy

Sun 17 Sep 2017 Read More

Compact primary keys

If the primary key on a table is an integer, it can be desirable after a lot of adding and removing either during testing (as was my case) or otherwise, to tidy up the key space a little and see the primary keys run up as unbroken sequences from 1. An excellent snippet here: https://djangosnippets.org/snippets/2915/ showed us how change the primary key value from in a given table and in all tables that relate to it (have a foreign key pointing into it). We can exploit that to achieve this outcome with integrity. For any given table we just fetch the primary keys into a sorted list and then walk the list assigning key 1, 2, 3, 4 etc where needed (if it doesn't already have that key).Because our list is sorted we're always moving tuples down the ladder of available keys to next empty slot basically until we've compacted the whole list. And voila. Mission accomplished. Works in with database introspection, in part because the integrity of relations is a little obscured by the ORM which hides intermediary tables in ManyToMany relationships and such. At the database API level these concerns all disappear. Built and tested with Django 1.11 but the form only goes to 1.10 here. Not even sure it works on 1.10. Certainly the snippet I based it on didn't work in 1.11 and need some updating.

• primary-key
• compact

Tue 22 Aug 2017 Read More

Image as base64 in django

Easy way to get base64 for the image to display in the template, eg: `<img src="{{ post.get_cover_base64 }}">`

• django
• image
• base64

Fri 04 Aug 2017 Read More

Dynamic DEBUG setting for PyCharm

1. Next to the Play button you can Edit Configuration 2. Click the green + on the left, add 2 "Django Server". Call one DEBUG, call the other RUN. 3. Add "DEBUG False" to RUN in its "Environment variables" 4. Add "DEBUG True" to DEBUG in its "Environment variables" (make sure the port # is different from RUN!) Change `DEBUG = True` in `settings.py` to the below code Go back to the main IDE window and either select RUN or DEBUG and go to localhost/404 to either see the dev debug 404 or your custom `404.html` (that you obviously previously made in the `/templates/` folder ;)

• PyCharm
• DEBUG
• IDE
• Dynamic

Fri 23 Feb 2018 Read More

Place a file in an object from command-line (Python 3.x only)

You can place this snippet in management/commands/ and have it upload files from disk into objects in your database. Usage: ``` python manage.py upload_file_to_model myapp mymodel myfield 1 field_name /some/file/path ```

• upload
• file
• cli
• command-line
• commandline

Tue 15 Aug 2017 Read More

Mixin to set url kwargs to Class Based Views

This mixin is for class based views. Kwargs passed from url patterns to views via the dispatch method.

• url
• Mixin
• Dynamic kwargs

Wed 21 Jun 2017 Read More

Wagtail Markdown Streamfield

A markdown streamfield for wagtail that includes a live preview.

• markdown
• wagtail
• streamfield

Mon 17 Apr 2017 Read More

django smartround filter

rounds floats in more human readable format e.g. 341.123434 mUSD -> 341mUSD 0.45345345 mUSD -> 0.5 mUSD 0.034545 mUSD -> 0.03 mUSD 0.0014545 mUSD -> 0.001 mUSD etc.

• smart round
• smartfloatformat

Tue 14 Mar 2017 Read More

Get all django remaining migrations

It will return list of all remaining migrations

• migration
• migrations

Fri 03 Mar 2017 Read More

Custom DRF browsable API interface for InBBoxFilter of django-rest-framework-gis

[DRF browsable API interface](http://www.django-rest-framework.org/api-guide/filtering/#customizing-the-interface) for django-rest-framework-gis [InBBoxFilter](https://github.com/djangonauts/django-rest-framework-gis#inbboxfilter) Tested with Django==1.10.5 django-filter==1.0.1 djangorestframework==3.5.4 djangorestframework-gis==0.11 

• django
• django-rest-framework
• django-rest-framework-gis

Thu 02 Mar 2017 Read More

Get template filename from within the template

Two simple tags to extract the template filename from within a template.

• template
• filename

Wed 08 Feb 2017 Read More

replace

Small example of how to write your own function. This is not available in Django. The function just replaces static text strings, regular expressions are not supported. The syntax is the same in SQLite, PostgreSQL, MySQL and Oracle.

• text
• replace

Wed 25 Jan 2017 Read More

CNPJ and CPF Validation for Models

The code was placed inside a helper file without using a class. The Django validator was not designed to work with validator classes, it would appear, so retrieving the value from the field proved to be a hassle. Just create a helper file, import it on your model, and use the validator in the standard way, as such: cnpj = models.CharField(unique=True, max_length=14, validators=[validate_CNPJ]) cpf = models.CharField(unique=True, max_length=14, validators=[validate_CPF])

• model
• validation
• cnpj
• cpf

Sat 14 Jan 2017 Read More

Simply Gravatar Templatetags

Simply Gravatar Templatetags, for example the name of this templatetag is: `templatetags/gravatar_tags.py`, this supported for Python2 or Python3.

• django
• image
• templatetag
• gravatar

Tue 10 Jan 2017 Read More

CSVField for forms

FileField that checks that the file is a valid CSV and if specified in `expected_fieldnames` checks that the fields match exactly. The widget's `accept` parameter is set to accept csv, text and excel files. **TODO**: Validate the entirety of the CSV file, not just the headers. But this should be enough for most use cases, as checking the whole file could be computationally expensive for huge files. Example usage: people = CSVField(expected_fieldnames=['First Name', 'Last Name'])

• forms
• csv
• field

Thu 22 Dec 2016 Read More