Add button to create a new empty FinacialLink

app/controllers/finance/financial_links_controller.rb

@@ -36,7 +36,7 @@ class Finance::FinancialLinksController < Finance::BaseController
   end
 
   def create
-    @financial_link = FinancialLink.new
+    @financial_link = FinancialLink.first_unused_or_create
     if params[:bank_transaction] then
       bank_transaction = BankTransaction.find(params[:bank_transaction])
       bank_transaction.update_attribute :financial_link, @financial_link

app/models/financial_link.rb

@@ -4,6 +4,12 @@ class FinancialLink < ApplicationRecord
   has_many :invoices
 
   scope :incomplete, -> { with_full_sum.where.not('full_sums.full_sum' => 0) }
+  scope :unused, -> {
+    includes(:bank_transactions, :financial_transactions, :invoices)
+      .where(bank_transactions: { financial_link_id: nil })
+      .where(financial_transactions: { financial_link_id: nil })
+      .where(invoices: { financial_link_id: nil})
+  }
   scope :with_full_sum, -> {
     select(:id, :note, :full_sum).joins(<<-SQL)
       LEFT JOIN (
@@ -27,4 +33,8 @@ class FinancialLink < ApplicationRecord
       ) full_sums ON full_sums.id = financial_links.id
     SQL
   }
+
+  def self.first_unused_or_create
+    unused.first || create
+  end
 end

app/views/finance/ordergroups/index.html.haml

@@ -3,6 +3,8 @@
 - content_for :actionbar do
   = link_to t('.show_all'), finance_transactions_path, class: 'btn'
   = link_to t('.show_foodcoop'), finance_foodcoop_financial_transactions_path, class: 'btn'
+  - if FinancialLink.any?
+    = link_to t('.new_financial_link'), finance_links_path, method: :post, class: 'btn'
   = link_to t('.new_transaction'), finance_new_transaction_collection_path, class: 'btn btn-primary'
 
 .well.well-small

config/locales/de.yml

@@ -955,6 +955,7 @@ de:
         title: Unbezahlte Rechnungen
     ordergroups:
       index:
+        new_financial_link: Neuer Finanzlink
         new_transaction: Neue Überweisungen eingeben
         show_all: Alle Transaktionen
         show_foodcoop: Foodcoop Transaktionen

config/locales/en.yml

@@ -956,6 +956,7 @@ en:
         title: Unpaid invoices
     ordergroups:
       index:
+        new_financial_link: New financial link
         new_transaction: Add new transactions
         show_all: All transactions
         show_foodcoop: Foodcoop transaktions