Question 1

How do I set up sequel-activerecord_connection in a Rails app?

Accepted Answer

Add the gem to your Gemfile, then create an initializer to load the extension on a Sequel database object matching your Active Record adapter. For PostgreSQL, use `Sequel.postgres(extensions: :activerecord_connection)`. Ensure compatibility with your Rails version.

Question 2

Does it work with Rails 6 and 7?

Accepted Answer

Yes, it supports Active Record versions, but for 7.1 or older, you need to include the after_commit_everywhere gem. Check the README for specific instructions on JRuby and adapter compatibility.

Question 3

What are the performance benefits of sharing a connection?

Accepted Answer

It reduces the number of open database connections, lowering memory usage and connection pool overhead on the database server. This is especially beneficial in high-traffic applications to avoid connection limits.

Question 4

Can I use sequel-activerecord_connection with JRuby?

Accepted Answer

Yes, it supports JDBC adapters for PostgreSQL, MySQL, and SQLite on JRuby. Initialize with a JDBC connection string like `Sequel.connect('jdbc:postgresql://', extensions: :activerecord_connection)`.

Question 5

Sequel or Active Record for complex queries with this gem?

Accepted Answer

Sequel is often better for complex queries due to its expressive DSL, while Active Record excels at simple CRUD. This gem lets you leverage Sequel's strengths without transactional issues, but debugging mixed ORM code can be trickier.

Question 6

How does transaction rollback work when mixing ORMs?

Accepted Answer

Rollbacks are synchronized; for example, a Sequel rollback inside an Active Record transaction affects the savepoint. However, be cautious of hook behavior differences, as after_commit callbacks may not fire as expected in some nested cases.

Question 7

Is it possible to use different models for connection configuration?

Accepted Answer

Yes, you can assign a different Active Record model using `DB.activerecord_model = MyModel`, which is useful for applications with multiple databases or custom connection logic, as shown in the README.

sequel-activerecord_connection

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