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All Lessons / Tagged ActiveRecord

Drag and Drop sortable lists with Rails & Stimulus JS

#343 · Apr 28, 2020

Drag and drop sortable lists in Rails aren't too hard using Sortablejs and Stimulus to make wire them up to our backend with acts_as_list

11

Tracking online users with timestamps

#330 · Feb 03, 2020

We can use timestamps in our database to track of online users in your Rails

0

How to Test Validations in Rails

#310 · Sep 05, 2019

Learn how to write tests for validations on ActiveRecord objects in Ruby on Rails

2

How to use Multiple Databases in Rails 6.0

#309 · Aug 27, 2019

With Rails 6.0, you can now define multiple primary and replica databases, define separate migrations for each primary database, and configure each model to read and write from different databases.

1

Handle Race Conditions with Pessimistic Locking

#308 · 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.

0

Preventing Conflicts with Optimistic Locking

#307 · Aug 15, 2019 Pro

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.

1

@mentions for Users with ActionText in Rails 6

#288 · Mar 11, 2019

Mentioning Users with an @mention is a super common feature. Trix and ActionText are now part of Rails 6 which means we can very easily add support for tagging users with @mentions and other custom attachments in your applications.

30

Dynamic Nested Forms with Stimulus JS

#283 · 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!

28

Autosave Draft Records - Part 2

#282 · Jan 31, 2019 Pro

Creating draft records in your database can be tricky. We'll be using the Draftsman gem to help us create draft versions of our records with our autosave Javascript

1

Autosave Draft Records - Part 1

#281 · 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.

3

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