Question

I have a bunch of users in my database with these attributes, however, I only want the email address for each user

#<User id: 1, email: "[e-mail]", encrypted_password: "", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2012-09-03 09:14:01", updated_at: "2012-09-03 09:14:01", name: nil, confirmation_token: nil, confirmed_at: nil, confirmation_sent_at: nil, unconfirmed_email: nil, opt_in: nil, invitation_token: nil, invitation_sent_at: nil, invitation_accepted_at: nil, invitation_limit: nil, invited_by_id: nil, invited_by_type: nil>,

In the console, I did

  u = User.all

which printed all the users and their attributes.

Now, to get the email address for each i tried

   u.each do |f|
     f.email
   end

but it just printed the whole list of users again, with all their attributes.

Can anyone show me how to print a list of email addresses for all the users, leaving out the other attributes.

Answer 1

Your console will print at the end the result of what you typed.

So if you write u.each { anything }, the console will print the result of the each loop. To print stuff explicitly, you need to use output function (puts, p, pp, print etc)

users = User.all
puts users.map(&:email).join("\n")