issues with model in ruby on rails

[amvis]

class SystemAdmin < ActiveRecord::Base

  belongs_to :user

end

class User < ActiveRecord::Base

  has_secure_password

  

  has_one  :system_admin  

end

@user = User.find_by_user_name(user_name)

              if !@user.system_admins.nil?

                 puts 'am a sys_admin'

The above code gives error like this

NoMethodError (undefined method `system_admins' for #<User:0xa81a2e0>):

  app/controllers/application_controller.rb:17:in `user_authenticate'

Have any problem with this condition checking  if !@user.system_admins.nil? also any problem with the model relation?

Thank you

vishnu

                

[Michael Pavling]

On 3 April 2012 09:12, amvis <vgrkr...@gmail.com> wrote:
> class User < ActiveRecord::Base

>   has_one  :system_admin
> end
>
> @user = User.find_by_user_name(user_name)
>               if !@user.system_admins.nil?
>                  puts 'am a sys_admin'
>
> The above code gives error

Since you've defined the association as a has_one, you should use it
in the singular:
if !@user.system_admin.nil?

but "!...nil?" is a bit stinky; either use:
if @user.system_admin
or
unless @user.system_admins.nil?

[amvis]

Thanks, got the solution...