What are some advanced techniques for Rails migrations?

What are some advanced techniques for Rails migrations?

Advanced techniques for Rails migrations include using reversible migrations, managing large datasets, and optimizing indexes.

Can you explain reversible migrations?

Reversible migrations allow you to define how to roll back a migration. You can use the up and down methods to specify changes.

What about managing large datasets during migrations?

For large datasets, consider using batch processing or the find_each method to avoid loading all records into memory at once.

How can I optimize indexes in my migrations?

You can optimize indexes by adding them in a separate migration after the data is loaded, or by using the concurrently option.