django notes

django_notes

#get version
python -c "import django; print(django.get_version())"

#create a project
django-admin.py startproject mysite

#run development server
python manage.py runserver OR python manage.py runserver 8080 OR python manage.py runserver 0.0.0.0:8000

#create databse tables from INSTALLED_APPS models
python manage.py syncdb

#create an app in the project
python manage.py startapp polls

#define model for polls in /polls/models.py
Each model is represented by a class that subclasses django.db.models.Model. 
Each model has a number of class variables, each of which represents a database field in the model.

Each field is represented by an instance of a Field class

You can use an optional first positional argument to a Field to designate a human-readable name. That’s used in a couple of introspective parts of Django, and it doubles as documentation.

Django supports all the common database relationships: many-to-ones, many-to-manys and one-to-ones.

# Add app to project
Edit the mysite/settings.py file again, and change the INSTALLED_APPS setting to include the string 'polls'.

# See SQL output of model (print to screen)
python manage.py sql polls

# Check for errors
python manage.py validate

#Update database with new models
python manage.py syncdb

#Interactive python/django shell
python manage.py shell

#Creating the public interface – “views.”


#Adding Users

django user login/registration

Users can be added from the admin portal or from the django API from the shell.

Under the app templates create a subdirectory called registration and add two new templates.

login.html:

{% block content %}

{% if form.errors %}
<p>Your username and password didn't match. Please try again.</p>
{% endif %}

Suck a nut

<form method="post" action="{% url 'django.contrib.auth.views.login' %}">
{% csrf_token %}
<table>
<tr>
    <td>{{ form.username.label_tag }}</td>
    <td>{{ form.username }}</td>
</tr>
<tr>
    <td>{{ form.password.label_tag }}</td>
    <td>{{ form.password }}</td>
</tr>
</table>

<input type="submit" value="login" />
<input type="hidden" name="next" value="{{ next }}" />
</form>

{% endblock %}

registration.html:
{% extends "base.html" %}

{% block title %}Create an account{% endblock %}

{% block content %}
  <h1>Create an account</h1>

  <form action="" method="post">
      {{ form.as_p }}
      <input type="submit" value="Create the account">
  </form>
{% endblock %}

#Understanding templates

>>> from django import template
>>> t = template.Template('My name is {{ name }}.')
>>> c = template.Context({'name': 'Adrian'})
>>> print t.render(c)
My name is Adrian.
>>> c = template.Context({'name': 'Fred'})
>>> print t.render(c)
My name is Fred.