What are some common Ruby idioms used in Rails?

What are some common Ruby idioms used in Rails?

Some common Ruby idioms in Rails include using map for transforming collections, select for filtering, and each_with_object for building a result while iterating.

Can you give me an example of using map in a Rails application?

Sure! If you have an array of user objects, you can use users.map(&:name) to get an array of user names.

What about select? How is it used?

select is used to filter elements. For example, users.select { |user| user.active? } returns only the active users.

Are there any idioms that help with database queries?

Yes! Using where with a block is a common idiom. For example, User.where { |u| u.age > 18 } retrieves users older than 18.