ActiveRecord Episodes - Ruby on Rails Screencast Tutorials

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Dynamic Nested Forms with Stimulus JS

Feb 07, 2019 Pro

Don't like Cocoon or it's jQuery dependency? We can use Stimulus JS and build dynamic nested forms in Rails with accepts_nested_attributes_for from scratch pretty easily!

16m

Preferences & Settings with ActiveRecord::Store

May 31, 2017 Pro

Use ActiveRecord::Store and ActiveRecord-TypedStore to save user preferences and settings to a single column in the database

33m

Scheduling Posts

Aug 26, 2015 Pro

Learn how to schedule posts in draft, published, and scheduled modes

15m

Atomic Updates And Performance with ActiveRecord Transactions

Feb 06, 2017 Pro

Learn how to use ActiveRecord Transactions to create atomic updates across multiple records and to improve the speed of bulk operations

22m

Nested Comment Threads in Rails - Part 1

Sep 12, 2018 Pro

How to build nested comments and threads in Ruby on Rails

10m

Preventing Conflicts with Optimistic Locking

When things (users, jobs, etc) attempt to update the same record at the same time, we can often lose changes. Optimistic locking uses a lock version number to warn you about updating stale objects so you can handle that safely.

17m

Autosave Draft Records - Part 1

Jan 23, 2019 Pro

Autosaving draft records allows you to make sure users don't lose their work and can easily write draft content without publishing right away. We'll be using Stimulus to build an autosave controller for our form and Draftsman to power the backend.

18m

ActiveSupport Concerns: Making a Soft Deletable module

Feb 12, 2015 Pro

An introduction to Ruby on Rails ActiveSupport concerns where we build a Soft Deletable module like the Paranoia gem

20m

Nested Comment Threads in Rails - Part 2

Sep 18, 2018 Pro

Implementing polymorphic, reusable comments across models and limiting the nesting allowed for nested comment threads

11m

Debugging Performance Problems In Your Views

May 04, 2015 Pro

Learn how I discovered and solved a performance bug in OneMonth.com's view partial

10m

Handle Race Conditions with Pessimistic Locking

Aug 22, 2019 Pro

Race conditions can cause problems with data integrity. We can prevent these issues with Pessimistic Locking in ActiveRecord which uses database row-level locking.

14m

Nested Comment Threads in Rails - Part 3

Sep 26, 2018 Pro

Using AJAX, we can submit our comments and have them render onto the page without a page refresh.

10m

How to Build Custom ActiveRecord Validations

Sep 20, 2021 Pro

Custom ActiveRecord validations are easy to make and they're implemented exactly the same way as the built-in Rails validations. It's super handy to be able to add nice, clean validations that you can repeat throughout your apps.

12m

ActiveRecord Default Scopes, Unscoped, and Unscope

Jun 22, 2021 Pro

ActiveRecord default_scopes are incredibly useful for some features like soft delete. But sometimes we need to undo a scope, so that's where unscope comes in.

17m

Reddit style comment thread pagination

Oct 08, 2018 Pro

Adding pagination to our nested comment threads is easier than you might think, plus we'll take a look at a couple different approaches we can use

Deleting Comments In Nested Threads

Oct 02, 2018 Pro

Nested comment threads pose a lot of unique challenges. One of these is deleting comments because you can easily lose the child comments or context. We'll take a look at a couple great ways of handling this.

15m

Slug History & Redirecting Old Slugs with FriendlyID

Jan 25, 2021 Pro

Updating slugs

15m

Polymorphic Selects in Rails using GlobalIDs

Jun 06, 2022 Pro

Using Signed GlobalIDs, we can create polymorphic select boxes in Rails to easily choose a record of any type. This is also secured by using signed global IDs to prevent tampering by malicious users.

Parallel ActiveRecord Queries with load_async in Rails 7

Nov 11, 2021 Pro

Complex queries can slow your page rendering down. We can now run long queries in parallel with Rails 7's load_async method in ActiveRecord to speed up page rendering.

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Sep 15, 2014 Pro