Add total per quarterly key

app/models/numeric_answer_data_export.rb

@@ -57,9 +57,13 @@ def object_data_as_hash(loan, quarters)
     hash.transform_keys! { |k| I18n.t("standard_loan_data_exports.headers.#{k}") }
 
     for key in QUARTERLY_KEYS do
+      total = 0
       for quarter in quarters do
-        hash["#{I18n.t("standard_loan_data_exports.headers.#{key}")} #{quarter[2]}"] = loan.send(key, start_date: quarter[0], end_date: quarter[1])
+        result = loan.send(key, start_date: quarter[0], end_date: quarter[1])
+        hash["#{I18n.t("standard_loan_data_exports.headers.#{key}")} #{quarter[2]}"] = result
+        total += result || 0
       end
+      hash["#{I18n.t("standard_loan_data_exports.headers.#{key}")}"] = total > 0 ? total : nil
     end
 
     hash["#{I18n.t("standard_loan_data_exports.headers.#{:created_at}")}"] = loan.created_at.to_date
@@ -82,6 +86,7 @@ def main_header_row(quarters)
       for quarter in quarters do
         headers.push("#{I18n.t("standard_loan_data_exports.headers.#{key}")} #{quarter[2]}")
       end
+      headers.push("#{I18n.t("standard_loan_data_exports.headers.#{key}")}")
     end
 
     headers.push(created_at)
@@ -106,12 +111,6 @@ def header_symbols
 
   private
 
-  def add_quarters_per_key(hash, quarters, key)
-    for quarter in quarters do
-      hash["#{key} #{quarter[0]} - #{quarter[1]}".to_sym] = "data"
-    end
-  end
-
   def get_quarter(date)
     remaining = (date.month - (3 * (date.month / 3.0).ceil)).abs
     end_month = date.month + remaining