Rails 7.2 Added Support For Explain Method To ActiveRecord::Relation.
When optimizing database queries in Rails, it’s essential to understand how the database plans to execute a query. Rails provides a built-in method, ActiveRecord::Relation#explain, to analyze and display a query’s execution plan. The output mimics the format of a database shell, offering valuable insights into query performance and potential bottlenecks.
Before Rails 7.1, the explain method provided basic query execution plans. Rails 7.1 introduced options like analyze and verbose to offer deeper insights into query performance. You can learn more about this in our blog post.
With Rails 7.2, the feature has been further enhanced. The explain method now supports pluck, count, first, and other methods directly on an ActiveRecord::Relation, making it even more powerful and user-friendly.
The explain method runs the database’s EXPLAIN command on the query triggered by the relation and returns the result. This allows us to:
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