What are some examples of unique constraints in Rails?
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What are some examples of unique constraints in Rails?
In Rails, unique constraints ensure that a column's values are unique across all records. For example, you can add a unique constraint to an email field in a User model.
Can you show me how to implement that in a migration?
Sure! In your migration file, you can add a unique index like this: add_index :users, :email, unique: true.
What happens if I try to insert a duplicate email?
If you try to insert a duplicate email, Rails will raise a ActiveRecord::RecordNotUnique error, preventing the record from being saved.
Are there any other examples of unique constraints?
Yes, you can also enforce uniqueness on usernames or any other field where duplicates shouldn't exist. Just use the same add_index method.
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