Session framework configuration in Django - Step-by-Step Execution

Concept Flow - Session framework configuration

Start Django Project

↓

Add 'django.contrib.sessions' to INSTALLED_APPS

↓

Configure SESSION_ENGINE in settings.py

↓

Run migrations to create session tables

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Use session in views to store/retrieve data

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Session data saved and retrieved per user

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End

This flow shows how Django session framework is set up and used step-by-step.

Execution Sample

Django

INSTALLED_APPS = [
    'django.contrib.sessions',
    # other apps
]

SESSION_ENGINE = 'django.contrib.sessions.backends.db'

# In a view:
request.session['key'] = 'value'

This code configures Django to use database-backed sessions and stores a value in the session.

Execution Table

Step	Action	Settings State	Effect	Session Data
1	Add 'django.contrib.sessions' to INSTALLED_APPS	INSTALLED_APPS includes sessions	Enables session app	{}
2	Set SESSION_ENGINE to 'django.contrib.sessions.backends.db'	SESSION_ENGINE set	Use DB for session storage	{}
3	Run migrations	Session tables created	DB ready for sessions	{}
4	In view, assign request.session['key'] = 'value'	Session engine active	Stores 'key':'value' in session	{"key": "value"}
5	Retrieve request.session['key']	Session engine active	Returns 'value'	{"key": "value"}
6	Session persists per user across requests	Session engine active	Data available until expiry or clear	{"key": "value"}
7	Session expires or cleared	Session engine active	Session data removed	{}

💡 Session data lifecycle ends when session expires or is cleared

Variable Tracker

Variable	Start	After Step 4	After Step 5	After Step 6	After Step 7
INSTALLED_APPS	Does not include sessions	Includes sessions	Includes sessions	Includes sessions	Includes sessions
SESSION_ENGINE	Not set	Set to DB backend	Set to DB backend	Set to DB backend	Set to DB backend
Session Data	{}	{"key": "value"}	{"key": "value"}	{"key": "value"}	{}

Key Moments - 3 Insights

Why do we need to add 'django.contrib.sessions' to INSTALLED_APPS?

Because Django only activates session features if the sessions app is listed in INSTALLED_APPS, as shown in step 1 of the execution_table.

What does setting SESSION_ENGINE to 'django.contrib.sessions.backends.db' do?

It tells Django to store session data in the database, enabling persistence across requests, as seen in step 2 and 3.

How does session data persist across user requests?

Session data is saved in the backend (database here) and linked to the user via a cookie, so data like {'key': 'value'} remains available until expiry or clearing, shown in steps 4 to 6.

Visual Quiz - 3 Questions

Look at the execution_table, what is the session data after step 4?

A {}

B {"user": "admin"}

C {"key": "value"}

D null

💡 Hint

Check the 'Session Data' column at step 4 in the execution_table.

At which step does Django create the database tables for sessions?

A Step 2

B Step 3

C Step 5

D Step 1

💡 Hint

Look for the step mentioning migrations and DB readiness in the execution_table.

If SESSION_ENGINE was not set, what would happen to session data?

A Session data would be stored in the database anyway

B Session data would be stored in cookies by default

C Session data would not persist across requests

D Session data would be lost immediately

💡 Hint

Django's default SESSION_ENGINE is 'django.contrib.sessions.backends.db'.

Concept Snapshot

Django session framework stores user data across requests.
Add 'django.contrib.sessions' to INSTALLED_APPS.
Set SESSION_ENGINE to choose storage (DB, cache, cookies).
Run migrations to create session tables if using DB.
Use request.session dict in views to save/retrieve data.
Session persists until expiry or manual clearing.

Full Transcript

This visual execution trace shows how to configure Django's session framework. First, you add 'django.contrib.sessions' to INSTALLED_APPS to enable session support. Then, you set SESSION_ENGINE in settings.py to specify where session data is stored; here, the database backend is used. Running migrations creates the necessary database tables. In views, you can store data in request.session like a dictionary. This data persists across user requests until the session expires or is cleared. The execution table tracks these steps and session data changes. Key points include the need to add the sessions app, the role of SESSION_ENGINE, and how session data persists. The quiz tests understanding of these steps and session behavior.