On Saturday, 18 May 2013 11:14:35 UTC-4, Denny Mueller wrote: > > This is my setup. I have a table user where all user with password and so > on are set. The customer table has some customer related data. The user_id > is the foreign key to relate the customers to the user. > > On of the column in the customer table is the customernumber. These > numbers has to be uniq for each user_id. > > > class Customers >> belongs_to :user >> end >> >> class Users >> has_many :customers >> end > > > For example. > > customer | customernumber | user_id > 1 0001 1 > 2 0002 1 > 3 0001 2 > 4 0001 3 > 5 0002 3 > > > How can i approach this? Any hints what I have to look for? >
validates_uniqueness_of has a 'scope' option that will do exactly what you're describing: class Customer < ActiveRecord::Base belongs_to :user validates_uniqueness_of :customernumber, :scope => :user_id end Depending on what you're intending to use the customer number for, you may also want to take a look at something like acts_as_list. --Matt Jones -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/ddd230c8-db99-40bd-ae18-93145083cb0f%40googlegroups.com?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
