Assuming a single creditor and multiple debtors for a single billing, you will need a one to one relationship for the creditor -> billing (belongs_to on the billing, as you have done), but a many to many relationship for debts -> users.
Generally, it's better to implement the many-to-many as a has_many :through so you can add logic. It's probably doubly important when there is money involved! I would rethink the dependent: destroy though. You probably want to use a soft delete instead, or else you will lose your past transactions. On 21 September 2014 05:37, Diego Dillenburg Bueno < diegodillenb...@gmail.com> wrote: > Hello everyone, > > I'm a beginner Rails developer and right now am building a sample project > to show off at some job apply. The app is rather simple, I guess, but I > have come to some doubts on what associations to chose and why. > > Basically a User can create a bill(being its creditor) and the billing can > have many other Users(as their debtors), so you can track up billings you > share with other persons, like rent, market, food orders etc, and control > what each one got to pay you. > > Right now I have the following model: > > class User < ActiveRecord::Base > has_many :billings, foreign_key: "creditor_id", dependent: :destroy > has_many :debts, foreign_key: "debtor_id", dependent: :destroy > end > > class Billing < ActiveRecord::Base > belongs_to :creditor, class_name: "User" > has_many :debts, dependent: :destroy > end > > class Debt < ActiveRecord::Base > belongs_to :billing > belongs_to :user > end > > would this be the better approach? Or something like: > User has_many billings through debts > Billing has_many debts ? > > And in that case, would appreciate some help to model those associations, > because I'm still kinda lost on this flow. > > Thanks in advance, > Diego Dillenburg Bueno > > -- > 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/CAOHSkmE893vhkwHsna6e5Ax4fCZipg965brtieXtr9Ui6OAVdw%40mail.gmail.com > <https://groups.google.com/d/msgid/rubyonrails-talk/CAOHSkmE893vhkwHsna6e5Ax4fCZipg965brtieXtr9Ui6OAVdw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- 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/CABLJ1D%2BrD9ENPDHS5xAAH_aYr2f33uq%2BMQRkmxPn%2B6-i%3DY_Q%3Dw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
