Form Validation – Geek Slack

Django – Introduction

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Overview of Web Development

Introduction to Django

What is Django?

Key Features of Django

Installing Django

Creating a Django Project

Django – Fundamentals

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Understanding Django Apps

Creating and Managing Apps

URL Routing and Views

Writing Views: Function-Based Views (FBVs)

Django – Models and Databases

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Introduction to Django ORM

Defining Models

Database Migrations

Interacting with the Database

Django CRUD Operations

QuerySets and Filters

Working with Relationships

Django – Forms and User Input

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Working with Forms

Django Forms Basics

Form Validation

Rendering and Processing Forms

Automatically Generating Forms from Models

Handling File Uploads

Uploading and Saving Files

Managing Media Files

Django – Admin

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Overview of the Django Admin Panel

Registering Models

Customizing Display, Search, and Filtering

Advanced Customizations

Custom Admin Templates

Django – Advanced Views and URL Handling

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Class-Based Views (CBVs)

Difference Between FBVs and CBVs

Commonly Used CBVs

Organizing URLs in Large Projects

Django as Middleware

Django – User Authentication and Authorization

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Built-in User Authentication System

Registering Users

Logging In and Out

Password Reset and Change

Permissions and Groups

Role-Based Access Control (RBAC)

Customizing User Models

Django – Static and Media Files

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Serving Static Files

Managing Media Files

Configuring Static and Media Files for Production

Django – Testing and Debugging

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Debugging Django Applications

Using Django Debug Toolbar

Common Errors and Fixes

Unit Tests for Models and Views

Integration Tests

Django – REST Framework (Optional Advanced Section)

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Introduction to REST APIs

Setting Up Django REST Framework (DRF)

Views and Routers

Building and Consuming APIs

Authentication and Permissions in DRF

Django – Deployment

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Preparing for Deployment

Debugging vs Production Mode

Collecting Static Files

Deploying with Gunicorn and Nginx

Deploying with Docker

Environment Variables and .env Files

Django Tutorial

About Lesson

Built-in Validation

Django forms come with built-in validation. For example:

CharField: Validates that the input is a string.
EmailField: Ensures the input is a valid email address.
required: By default, fields are required. You can set required=False for optional fields.

Custom Validation

You can add custom validation logic for fields by overriding the clean_<fieldname> method in the form:

class ContactForm(forms.Form):
    name = forms.CharField(max_length=100)
    email = forms.EmailField()

    def clean_name(self):
        name = self.cleaned_data['name']
        if "badword" in name:
            raise forms.ValidationError("Name contains inappropriate words.")
        return name

Form Errors

Form errors are displayed in the template like this:

{% if form.errors %}
    
        {% for field in form %}
            {% for error in field.errors %}
                {{ error }}
            {% endfor %}
        {% endfor %}
    
{% endif %}