Rails order by association field

Question

I have the following models

class User
  attr_accesible :first_name, :phone_number
  has_one :user_extension
end

class UserExtension
  attr_accessible :comp         


        

Answer 1

@users = User.order("user_extension.company desc") should work fine.

Answer 2

Old topic, and perhaps off topic, but I needed this. FWIW:

Order by association field

User.includes(:user_extension).order('user_extensions.company ASC')

Lets make it more interesting, create more associations.

Order by the associations two levels deep.

User.includes(user_extension: :company).order('companies.name ASC')

Order by the associations three levels deep.

User.includes(user_extension: { company: :guilds }).order('guilds.secret_knock ASC')

Answer 3

Try this:

@users = User.includes(:user_extension).order("user_extensions.company desc")

I think you need at order: user_extensions, not user_extension

Answer 4

Merge can make the query smaller/saner-looking, and it benchmarked faster for me in Rails 4.x:

@users = User.joins(:user_extension).merge(UserExtension.order(company: :desc))