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, batching updates, and managing large datasets efficiently.

Can you explain what reversible migrations are?

Reversible migrations allow you to define how to roll back a migration, making it easier to undo changes if needed.

How can I batch updates in a migration?

You can use the find_in_batches method to process records in batches, which helps reduce memory usage during large updates.

What are some best practices for managing large datasets during migrations?

Best practices include using indexes, avoiding large transactions, and testing migrations in a staging environment first.