Show the financial transaction type if there are more than one type #367

app/models/financial_transaction_class.rb

@@ -3,4 +3,18 @@ class FinancialTransactionClass < ActiveRecord::Base
 
   validates :name, presence: true
   validates_uniqueness_of :name
+
+  scope :sorted, -> { order(name: :asc) }
+
+  def self.has_multiple_classes
+    FinancialTransactionClass.count > 1
+  end
+
+  def display
+    if FinancialTransactionClass.has_multiple_classes
+      name
+    else
+      I18n.t('activerecord.attributes.financial_transaction.amount')
+    end
+  end
 end

app/models/ordergroup.rb

@@ -27,6 +27,18 @@ class Ordergroup < Group
     User.natural_order.all.reject { |u| (users.include?(u) || u.ordergroup) }
   end
 
+  def self.include_transaction_class_sum
+    columns = ['groups.*']
+    FinancialTransactionClass.all.each do |c|
+      columns << "sum(CASE financial_transaction_types.financial_transaction_class_id WHEN #{c.id} THEN financial_transactions.amount ELSE 0 END) AS sum_of_class_#{c.id}"
+    end
+
+    select(columns.join(', '))
+      .joins('LEFT JOIN financial_transactions ON groups.id = financial_transactions.ordergroup_id')
+      .joins('LEFT JOIN financial_transaction_types ON financial_transaction_types.id = financial_transactions.financial_transaction_type_id')
+      .group('groups.id')
+  end
+
   def last_user_activity
     last_active_user = users.order('users.last_activity DESC').first
     if last_active_user