Home/Courses/Ruby on rails/Active Record Mastery

Active Record Mastery🗃️

Intermediate→Advanced

Rails 8.1

Master advanced Active Record patterns including complex associations, query optimization, callbacks, custom validations, and database patterns for scalable Rails applications.

6

Sections

24

Lessons

24

Challenges

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24 lessons and 24 challenges, all 100% free.

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Polymorphic Associations

Self-Referential Associations

Delegated Types

Polymorphic Association Basics(Sign in required)

Beginner+10 Mana

Polymorphic Columns(Sign in required)

Intermediate+20 Mana

Single Table Inheritance (STI)

STI Type Column(Sign in required)

Intermediate+20 Mana

Self Join Class Name(Sign in required)

Advanced+30 Mana

Advanced Where Clauses

Joins, Includes, and Eager Loading

Subqueries and Merging Scopes

Basic Query Method(Sign in required)

Beginner+10 Mana

OR Query Methods(Sign in required)

Intermediate+20 Mana

Grouping and Aggregations

Joins vs Includes(Sign in required)

Intermediate+20 Mana

Group Count Return Value(Sign in required)

Intermediate+20 Mana

Understanding Callbacks

Conditional Callbacks

Suppressing and Skipping Callbacks

First Callback in Save(Sign in required)

Beginner+10 Mana

Callback Lifecycle Order(Sign in required)

Intermediate+20 Mana

Transaction Callbacks

Halt Callback Chain(Sign in required)

Intermediate+20 Mana

After Commit vs After Save(Sign in required)

Advanced+30 Mana

Building Custom Validators

Validation Contexts and Conditional Logic

Attribute Normalizations

Checking Validity(Sign in required)

Beginner+10 Mana

EachValidator Method(Sign in required)

Intermediate+20 Mana

Database-Level Constraints

Validation Context(Sign in required)

Intermediate+20 Mana

Database Constraint Types(Sign in required)

Advanced+30 Mana

Advanced Migration Techniques

Zero-Downtime Migrations

Schema Management and db:prepare

Generating Migrations(Sign in required)

Beginner+10 Mana

Reversible Migration(Sign in required)

Intermediate+20 Mana

Data Migrations and Seeds

Safe Column Removal(Sign in required)

Advanced+30 Mana

Batch Migration Count(Sign in required)

Intermediate+20 Mana

Scopes and Query Objects

Service Objects and Form Objects

Enum Attributes

Defining Scopes(Sign in required)

Beginner+10 Mana

Scope Return Values(Sign in required)

Intermediate+20 Mana

Query Objects and Concerns

Service Object Purpose(Sign in required)

Intermediate+20 Mana

Concern Structure(Sign in required)

Advanced+30 Mana

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24 interactive lessons and 24 hands-on challenges — learn in VS Code, Cursor, or the web.