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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.
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.
Hotwire lets us broadcast changes so we can use the same approach for nested comments, but in realtime!
Updating slugs
Testing a gem or your Rails app against multiple Ruby and Rails versions is super useful, but we also take it a step further and test our gem against several different databases too
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
We can use timestamps in our database to track of online users in your Rails
Learn how to write tests for validations on ActiveRecord objects in Ruby on Rails
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.
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