Add option to ignore financial transaction when calculating the balance

app/models/financial_transaction_class.rb

@@ -1,10 +1,14 @@
 class FinancialTransactionClass < ApplicationRecord
   has_many :financial_transaction_types, dependent: :destroy
   has_many :supplier_category, dependent: :restrict_with_exception
+  has_many :financial_transactions, through: :financial_transaction_types
+  has_many :ordergroups, -> { distinct }, through: :financial_transactions
 
   validates :name, presence: true
   validates_uniqueness_of :name
 
+  after_save :update_balance_of_ordergroups
+
   scope :sorted, -> { order(name: :asc) }
 
   def self.has_multiple_classes
@@ -18,4 +22,10 @@ class FinancialTransactionClass < ApplicationRecord
       I18n.t('activerecord.attributes.financial_transaction.amount')
     end
   end
+
+  private
+
+  def update_balance_of_ordergroups
+    ordergroups.each { |og| og.update_balance! }
+  end
 end

app/models/financial_transaction_type.rb

@@ -2,6 +2,7 @@ class FinancialTransactionType < ApplicationRecord
   belongs_to :financial_transaction_class
   belongs_to :bank_account, optional: true
   has_many :financial_transactions, dependent: :restrict_with_exception
+  has_many :ordergroups, -> { distinct }, through: :financial_transactions
 
   validates :name, presence: true
   validates_uniqueness_of :name
@@ -9,6 +10,7 @@ class FinancialTransactionType < ApplicationRecord
   validates_format_of :name_short, :with => /\A[A-Za-z]*\z/
   validates :financial_transaction_class, presence: true
 
+  after_save :update_balance_of_ordergroups
   before_destroy :restrict_deleting_last_financial_transaction_type
 
   scope :with_name_short, -> { where.not(name_short: [nil, '']) }
@@ -27,4 +29,10 @@ class FinancialTransactionType < ApplicationRecord
   def restrict_deleting_last_financial_transaction_type
     raise I18n.t('model.financial_transaction_type.no_delete_last') if FinancialTransactionType.count == 1
   end
+
+  private
+
+  def update_balance_of_ordergroups
+    ordergroups.each { |og| og.update_balance! }
+  end
 end

app/models/ordergroup.rb

@@ -103,7 +103,11 @@ class Ordergroup < Group
   end
 
   def update_balance!
-    update_attribute :account_balance, financial_transactions.sum('amount')
+    new_account_balance = financial_transactions
+      .joins(financial_transaction_type: [:financial_transaction_class])
+      .where({ financial_transaction_classes: { ignore_for_account_balance: false} })
+      .sum(:amount)
+    update_attribute :account_balance, new_account_balance
   end
 
   def avg_jobs_per_euro

app/views/admin/financial_transaction_classes/_form.html.haml

@@ -4,6 +4,7 @@
     %h3= @financial_transaction_class.new_record? ? t('.title_new') : t('.title_edit')
   .modal-body
     = f.input :name
+    = f.input :ignore_for_account_balance
   .modal-footer
     = link_to t('ui.close'), '#', class: 'btn', data: {dismiss: 'modal'}
     = f.submit class: 'btn btn-primary'