Django

Framework

Python Girona 15/11/2017

Django App&API (Manel Clos) + React client (Francesc Arpí)

Què és Django?

Framework web, codi obert, Python
Des de finals del 2005
Documentació!
Configurable (BD, cache, plantilles...)
ORM
Suport a "llarg" termini
Política canvis, actualitzacions
Github: 29,565 estrelles
Github: 1,491 contribuidors

Creació webapp molt senzilla

Virtualenv
Pip
Django

Virtualenv - crear entorn

$ virtualenv venv
New python executable in /.../pygrn/venv/bin/python
Installing setuptools, pip, wheel...done.


$ . venv/bin/activate


(venv) $

Pip: instal·lar Django

(venv) $ pip install django
Collecting django
  Downloading Django-1.11.7-py2.py3-none-any.whl (6.9MB)
    100% |████████████████████████████████| 7.0MB 163kB/s 
Collecting pytz (from django)
  Downloading pytz-2017.3-py2.py3-none-any.whl (511kB)
    100% |████████████████████████████████| 512kB 1.9MB/s 
Installing collected packages: pytz, django
Successfully installed django-1.11.7 pytz-2017.3

Django: crear projecte

(venv) $ django-admin startproject todos_project


(venv) $ cd todos_project/


(venv) $ dir -l
total 8
-rwxr-xr-x  1 manel  staff  811 Nov  6 20:12 manage.py
drwxr-xr-x  6 manel  staff  204 Nov  6 20:12 todos_project

Django: servidor devel

(venv) $ python manage.py runserver
Performing system checks...

System check identified no issues (0 silenced).

You have 13 unapplied migration(s). Your project may not work
properly until you apply the migrations for app(s): admin, auth,
contenttypes, sessions.
Run 'python manage.py migrate' to apply them.

November 06, 2017 - 19:14:10
Django version 1.11.7, using settings 'todos_project.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.

Django

Creació webapp molt senzilla (II)

Admin
Migracions
Superuser

Django: admin

Django: migracions

(venv) $ python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
  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 auth.0008_alter_user_username_max_length... OK
  Applying sessions.0001_initial... OK

Django: superusuari

(venv) $ python manage.py createsuperuser
Username (leave blank to use 'manel'): admin
Email address: 
Password: 
Password (again): 
Superuser created successfully.


(venv) $ python manage.py runserver

Django: admin dashboard

Django: admin users

Django: admin - edició

Creació webapp molt senzilla (III)

Aplicació todos
Vistes
Plantilles

Django: crear app

(venv) $ python manage.py startapp todos

Django: vista senzilla

Django: urlpatterns app

Django: urlpatterns projecte

Django: vista al navegador

Django: vista amb plantilla

Django: plantilla

Django: installed apps

Django: resultat web

Creació webapp molt senzilla (IV)

Models
Models a l'admin
Errors
Migracions

Django: models

Django: model a l'admin

Django: admin dashboard

Django: errors en mode debug

Django: crear migracions

(venv) $ python manage.py makemigrations todos
Migrations for 'todos':
  todos/migrations/0001_initial.py
    - Create model Todo



(venv) $ python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, sessions, todos
Running migrations:
  Applying todos.0001_initial... OK

Django: admin - llistat todos

Django: admin - afegir todo

Django: admin - configuració

class QuestionAdmin(admin.ModelAdmin):
    # ...
    list_display = ('question_text', 'pub_date')
    list_filter = ['pub_date']
    search_fields = ['question_text']

Extensió de la webapp per dotar-la d'una petita API REST

Djando REST Framework
Serialitzador
Vista
Router

Django: instal·lar DRF

(venv) $ pip install djangorestframework
Collecting djangorestframework
  Downloading djangorestframework-3.7.3-py2.py3-none-any.whl (1.5MB)
    100% |████████████████████████████████| 1.5MB 679kB/s 
Installing collected packages: djangorestframework
Successfully installed djangorestframework-3.7.3