On Jul 26, 2011, at 3:58 PM, KlausG wrote: > I whonder why a product should have many orders? It belongs to > orders..
Not being paying much attention to this thread, but whenever I see comments like this I'm cautious. Bear in mind that if products are mutable (can vary over time), typically you want to replicate some of their data as of a point in time so that a order has-many order_items which contain product information as at that point in time. Otherwise if you're not careful, updating the price on your products completely changes the value of all of your historic orders containing that product. Apologies if it's not relevant to the thread, but if it is, it's something that should be considered in the design. Best Wishes, Peter > >>> class Customer < ActiveRecord::Base >>> has_many :orders >>> end >>> class Order < ActiveRecord::Base >>> belongs_to :customer >>> has_many :products >>> end >>> class Product < ActiveRecord::Base >>> belongs_to :orders >>> end > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
