Django

Setup:

A Complete Beginner's Guide (Catoon)
1 Python
Mac homebrew -> python3

2 Virualenv
pip3 install virtualenv (homebrew installed pip when install python)

3 Django
in a newly made project directory, activate virtual environment before install Django
virtualenv venv -p python3
source venv/bin/activate
pip install django

B https://www.youtube.com/watch?v=tptRTf3IWrM

1 Python
cmd

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request.POST.get('sth') vs request.POST['sth'] - difference?

request.POST['sth'] will raise a KeyError exception if 'sth' is not in request.POST.

request.POST.get('sth') will return None if 'sth' is not in request.POST.

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How to check if django form data is None, ' ' (empty string), or False

The problem is that by checking for:

 if form.data['first_name'] is None:

Only checks for if the value is None, where as:

if form.data['first_name']:

Checks for None or '' an empty string or False come to that.

What you could also do is:

return bool(form.data.get('first_name', False))

In this case if form.data['first_name'] is not present it will return False, if the value is None or '' this will also return False, if the value is True or 'a string' it will return True.

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create project inside git repository directory with different project name other than creating sub-directory.
https://automationpanda.com/2018/02/06/starting-a-django-project-in-an-existing-directory/

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SSH tunneling:

 vagrant ssh -- -N -L 8000:127.0.0.1:8000 in host
https://stackoverflow.com/questions/18157353/connection-reset-when-port-forwarding-with-vagrant

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Django form with choices but also with input option
https://stackoverflow.com/questions/24783275/django-form-with-choices-but-also-with-freetext-option
https://stackoverflow.com/questions/16055808/django-form-dropdown-list-of-stored-models

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OT:
Postgres full-text search is Good Enough!
http://rachbelaid.com/postgres-full-text-search-is-good-enough/

Postgres Full-Text Search With Django 
http://blog.lotech.org/postgres-full-text-search-with-django.html

Storing Images In DB Using Django Models
https://stackoverflow.com/questions/18747730/storing-images-in-db-using-django-models

https://wsvincent.com/django-search/

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$ sudo apt-get install software-properties-common
$ sudo add-apt-repository ppa:deadsnakes/ppa
$ sudo apt-get update
$ sudo apt-get install python3.6

https://docs.python-guide.org/starting/install3/linux/

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ManyToMany field and FliterSelectMultiple:

ORM relationship cheatsheet:
https://hackernoon.com/django-orm-relationships-cheat-sheet-14433d6cf68c

Django Models: Setting up Many-to-Many Relationships through Intermediate Models
https://medium.com/@aswinshenoy/django-admin-setting-up-many-to-many-relationships-with-intermediate-models-782895cb48b2

Django Document Form fields:
https://docs.djangoproject.com/en/dev/ref/forms/fields/#django.forms.ModelMultipleChoiceField

Django - Use the Django admin app's FilteredSelectMultiple widget in form
- January 29, 2014
https://www.dangtrinh.com/2014/01/django-use-django-admin-apps.html

https://stackoverflow.com/questions/55859820/how-to-create-the-same-form-in-group-and-permission-on-django-templates

https://stackoverflow.com/questions/43419030/django-modelmultiplechoicefield-widget-not-rendering

https://hackernoon.com/django-orm-relationships-cheat-sheet-14433d6cf68c

https://stackoverflow.com/questions/57820652/need-guidance-with-filteredselectmultiple-widget

https://github.com/jazzband/django-sortedm2m

FilteredSelectMultiple does not respect order
https://code.djangoproject.com/ticket/15881

https://stackoverflow.com/questions/10366045/django-how-to-save-data-to-manytomanyfield

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https://stackoverflow.com/questions/10583652/uncaught-referenceerror-django-is-not-defined

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Redefine eligible student QuerySet
http://www.columbia.edu/~njn2118/journal/2016/1/29.html

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