How to select only specific attributes from a model?

Question

I want to select only specific attributes from a model(id,name).

The SQL-command can be for example:

SELECT id,name,username FROM Users

Do you know h

Answer 1

SQL

SELECT id,name,username FROM Users

RUBY

User.select(:id, :name, :username)

with condition, you can write like: User.select(:id, :name, :username).find_by(:age 22)