Django---Installation-Requirements

Documents the setting up of Django dev environment

Setup virtual environment

The following command wil create an environment directory in miniconda3/envs:

conda create --name <Name of the environment> python=2.7

Create the project

Go to the directory where you want project to be created.

Run the following command to create the project:

django-admin startproject <project name>

You will noe see the following two when you run ls -- <project name> and manage.py

Inside <project name> you wil see the following files:

init.py
settings.py
urls.py
wsgi.py

Setup databases:

python manage.py migrate

Now, you will now see a database there:

<project name> db.sqlite3 manage.py

Finally,

Run the server

python manage.py runserver. Test it by going to http://127.0.0.1:8000/

Create a new app

python manage.py startapp browseCatalog

validate the models

python manage.py check

Tell django that changes have been made to the model

python manage.py makemigrations browseCatalog

The sqlmigrate command takes migration names and returns their SQL

python manage.py sqlmigrate browseCatalog 0001

The sqlmigrate command doesn’t actually create the tables or otherwise touch your database – it just prints output to the screen so you can see what SQL Django would execute if you asked it.

committing the SQL to the database

python manage.py migrate

Object initialization and saving it

p1 = Publisher(...)
# At this point, p1 is not saved to the database yet!
p1.save()
# Now it is.

If you want to create an object and save it to the database in a single step, use the objects.create() method.

Model class tips:

The DoesNotExist exception is an attribute of the model’s class – Publisher.DoesNotExist. In your applications, you’ll want to trap these exceptions, like this:

try:
    p = Publisher.objects.get(name='Apress')
except Publisher.DoesNotExist:
    print ("Apress isn't in the database yet.")
else:
    print ("Apress is in the database.")

Creating super users:

python manage.py createsuperuser

Adding Models to Django Admin

from django.contrib import admin
from .models import Publisher, Author, Book

admin.site.register(Publisher)
admin.site.register(Author)
admin.site.register(Book)

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