Trying to destroy a model, saying wrong number of arguments (0 for 1)

Question

I'm not sure why I am getting this error:

wrong number of arguments (0 for 1)

app/models/user.rb:38:in `sign_out_by_guid'
app/helpers/user_helper.rb:11:in `sign_out'
app/controllers/users_controller.rb:18:in `destroy'

My code:

def self.sign_out_by_guid(guid)
    puts 'currently in sign_out_by_guid' + guid
    u = User.where("guid = ?", guid) 
    puts u.inspect
    puts 'before destroy'
    u.destroy
    puts 'called destroy'
  end

I can see all the puts output expect for the last one "called destroy"

So this means for sure the call to u.destroy is the issue.

If I try getting a record in rails console, and calling destroy on the user it works fine.

What could this be?

Answer 1

u is a collection of Users, but destroy needs to be called on a single user, or on a relation with an argument denoting the ID of the User. You can either do:

u = User.where("guid = ?", guid).first

or

u = User.find_by_guid(guid)