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Rails 6 adds ActiveRecord::Relation#extract_associated
This blog is part of our Rails 6 series.
Rails 6.0 was recently released.
Before Rails 6,
if we want to extract associated records from an
ActiveRecord::Relation,
we would use preload and collect.
For example,
we want to fetch subscriptions of some users.
The query would look as shown below.
Rails 5.2
1User.where(blocked: false).preload(:subscriptions).collect(&:subscriptions)
2
3=> # returns collection of subscription recordsActiveRecord::Relation#extract_associated provides a shorthand to achieve same result and is more readable than former.
Rails 6.0.0.beta3
1User.where(blocked: false).extract_associated(:subscriptions)
2
3=> # returns the same collection of subscription recordsHere's the relevant pull request for this change.
