update a foreign key in an association table

rubyonrails-talk
1

Hello,

I'd like to know how to update a foreign key in an association table (many_to_many association) ?

Here is my model, Split is the association table between Account and Transaction:

class Account < ActiveRecord::Base     set_primary_key :guid

    has_many :splits, :foreign_key => 'account_guid', :primary_key => 'guid'     has_many :transactions, :through => :splits end

class Transaction < ActiveRecord::Base     set_primary_key :guid

    has_many :splits, :foreign_key => 'tx_guid', :primary_key => 'guid'     has_many :accounts, :through => :splits end

class Split < ActiveRecord::Base     belongs_to :transaction, :foreign_key => 'tx_guid', :primary_key => 'guid'     # here is the association that I'd like to change:     belongs_to :account, :foreign_key => 'account_guid', :primary_key => 'guid' end

I'm trying this but it does not work (the value is not updated):

account = Account.new transaction.splits.first.account = account # error: prints the old value of account puts transaction.splits.first.account

Do you have any idea ? Do I need to create a new Split and delete the old one or is it possible to update the existing one ?

Thank you for your help,

Fabrice