Toggle sidebar

Previous: Logging Enum Changes for Auditing

All books ▸ Mastering Enums in Rails ▸ Chapter 9: Enum in State Machines

Chapter 9: Enum in State Machines

Mastering Enums in Rails

Chapter 1: Introduction to Enums in Rails

What is an Enum in Rails?

How Enums Have Evolved in Rails

Key Features of Enums

When to Use Enums (and When Not To)

Chapter 2: Defining and Using Enums in Rails 8

Introduction to Enum Definition in Rails 8

Setting Up Enum in Rails 8 with Migrations

Defining and Using Enums in Rails 8

Enum Validations in Rails 8

Changes in _prefix and _suffix in Rails 8

Best Practices for Using Enums in Rails 8

Enum Pitfalls and How to Avoid Them

Chapter 3: Advanced Techniques with Enums in Rails 8

Introduction to Advanced Enum Techniques

Using Scopes and Custom Queries with Enums

Using Multiple Enums in a Single Model

Dynamically Updating Enum Values Without Breaking Records

Using Enums in API Responses (Serialization Techniques)

Handling Deprecated Enum Values Safely

Chapter 4: Querying and Filtering with Enums in Rails

Querying Records Using Enum Methods

Using Where Queries with Enums

Combining Enums with Other Query Conditions

Using Custom Scopes for Enum Queries

Using Enums with Raw SQL Queries

Enum Queries with Joins and Associations

Sorting Records Based on Enums

Handling Enum Queries in API Responses

Common Mistakes When Querying with Enums

Chapter 5: Enum Validations and Constraints in Rails

Validating Enum Presence

Restricting Values with Inclusion Validation

Preventing Invalid Assignments

Enforcing Enum Constraints at the Database Level

Using Default Enum Values

Handling Enum Constraints with Custom Scopes

Preventing Enum Modifications in Production

Chapter 6: Enum and Database Indexing in Rails

Why Indexing Matters for Enums

When to Use an Index for Enum Columns

Using Composite Indexes with Enums

Partial Indexing for Enums

Indexing Enum Columns in Rails 8

Avoiding Pitfalls with Enum Indexing

Chapter 7: Enum and Internationalization (I18n) in Rails

Understanding Enum and Internationalization (I18n) in Rails

The Problem with Default Enum Labels in Multilingual Apps

Using I18n to Translate Enum Labels

Using Enum Translations in Views

Translating Enums in Select Dropdowns

Localizing Enum Scopes and Queries

Enum Internationalization in APIs

Enum Internationalization in Rails 8

Best Practices for Enum Internationalization

Chapter 8: Enum and ActiveRecord Callbacks

Introduction to ActiveRecord Callbacks with Enums

Using Callbacks to Set Default Enum Values

Preventing Invalid Enum Transitions with Callbacks

Triggering Notifications Based on Enum Changes

Logging Enum Changes for Auditing

Chapter 9: Enum in State Machines

Understanding State Machines and Enums

Using Enums as a Simple State Machine

Using AASM for Full State Management

Chapter 10: Testing Enums in Rails

Why Testing Enums is Important

Writing Model Tests for Enums

Using FactoryBot for Enum Testing

Testing Enum Queries

Next: Understanding State Machines and Enums