Adopt model to reference GroupOrder in generated FinancialTransaction

app/models/financial_transaction.rb

@@ -5,6 +5,7 @@ class FinancialTransaction < ApplicationRecord
   belongs_to :user
   belongs_to :financial_link
   belongs_to :financial_transaction_type
+  belongs_to :group_order
   belongs_to :reverts, class_name: 'FinancialTransaction', foreign_key: 'reverts_id'
   has_one :reverted_by, class_name: 'FinancialTransaction', foreign_key: 'reverts_id'
 

app/models/group_order.rb

@@ -8,6 +8,7 @@ class GroupOrder < ApplicationRecord
   belongs_to :ordergroup
   has_many :group_order_articles, :dependent => :destroy
   has_many :order_articles, :through => :group_order_articles
+  has_one :financial_transaction
   belongs_to :updated_by, :class_name => "User", :foreign_key => "updated_by_user_id"
 
   validates_presence_of :order_id

app/models/order.rb

@@ -244,7 +244,7 @@ class Order < ApplicationRecord
       for group_order in gos
         if group_order.ordergroup
           price = group_order.price * -1                  # decrease! account balance
-          group_order.ordergroup.add_financial_transaction!(price, transaction_note, user, transaction_type)
+          group_order.ordergroup.add_financial_transaction!(price, transaction_note, user, transaction_type, nil, group_order)
         end
       end
 

app/models/ordergroup.rb

@@ -80,9 +80,9 @@ class Ordergroup < Group
 
   # Creates a new FinancialTransaction for this Ordergroup and updates the account_balance accordingly.
   # Throws an exception if it fails.
-  def add_financial_transaction!(amount, note, user, transaction_type, link = nil)
+  def add_financial_transaction!(amount, note, user, transaction_type, link = nil, group_order = nil)
     transaction do
-      t = FinancialTransaction.new(ordergroup: self, amount: amount, note: note, user: user, financial_transaction_type: transaction_type, financial_link: link)
+      t = FinancialTransaction.new(ordergroup: self, amount: amount, note: note, user: user, financial_transaction_type: transaction_type, financial_link: link, group_order: group_order)
       t.save!
       update_balance!
       # Notify only when order group had a positive balance before the last transaction:

app/views/finance/financial_transactions/_transactions.html.haml

@@ -38,7 +38,11 @@
         %td= h show_user(t.user)
         - if FinancialTransactionType.has_multiple_types
           %td= h t.financial_transaction_type.name
-        %td= h t.note
+        %td
+          - if t.group_order
+            = link_to t.note, t.group_order
+          - else
+            = t.note
         - FinancialTransactionClass.sorted.each do |c|
           %td.numeric{style: 'width:5em'}
             - if t.financial_transaction_type.financial_transaction_class == c