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What are Ruby on Rails migrations and how do they work?

An example of an AI chatbot conversation about Ruby on Rails migrations structure.

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You

What are Ruby on Rails migrations and how do they work?

MagicBuddy
MagicBuddy

Ruby on Rails migrations are a way to alter your database schema over time in a consistent and easy way. They allow you to create, modify, and delete database tables and columns.

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You

Can you give me an example of a migration?

MagicBuddy
MagicBuddy

Sure! A simple migration to create a 'users' table might look like this: create_table :users do |t| t.string :name t.string :email t.timestamps end.

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You

How do I roll back a migration?

MagicBuddy
MagicBuddy

You can roll back a migration using the command rails db:rollback. This will undo the last migration that was run.

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You

What if I want to change a column type?

MagicBuddy
MagicBuddy

You can change a column type using the change_column method in a migration, like this: change_column :users, :age, :integer.

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You

Are there any best practices for writing migrations?

MagicBuddy
MagicBuddy

Yes, it's best to keep migrations small and focused, use descriptive names, and always test them in a development environment before running in production.

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