What are some examples of Ruby on Rails migration commands?

What are some examples of Ruby on Rails migration commands?

Ruby on Rails migrations are used to modify your database schema. Here are a few examples:

1. rails generate migration AddFieldToTable field_name:data_type
2. rails db:migrate
3. rails db:rollback to undo the last migration.

Can you explain what each command does?

Sure!

1. rails generate migration AddFieldToTable field_name:data_type creates a new migration file to add a field to a specified table.
2. rails db:migrate applies all pending migrations to the database, updating the schema.
3. rails db:rollback reverts the last migration, allowing you to undo changes.

What if I want to remove a column?

You can remove a column using the command: rails generate migration RemoveFieldFromTable field_name:data_type. Then run rails db:migrate to apply the change.

Are there any best practices for writing migrations?

Yes! Some best practices include keeping migrations small and focused, using descriptive names, and always testing your migrations in a development environment before applying them to production.