implement writing to choices tab using options_to_xls external method

Gemfile

@@ -178,7 +178,7 @@ group :development, :test do
   gem "awesome_print", "~> 1.6"
   gem "database_cleaner", "~> 1.7"
   gem "db-query-matchers", "~> 0.10"
-  gem "rubocop", "1.22.1" # Hound supported versions: http://help.houndci.com/en/articles/2461415-supported-linters
+  gem "rubocop", "1.22.3" # Hound supported versions: http://help.houndci.com/en/articles/2461415-supported-linters
   gem "rubocop-rails", "~> 2.8"
   gem "rubocop-rake", "~> 0.6.0"
   gem "rubocop-rspec", "~> 2.0"

Gemfile.lock

@@ -491,7 +491,7 @@ GEM
       rspec-mocks (~> 3.9.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.4)
-    rubocop (1.22.1)
+    rubocop (1.22.3)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
@@ -708,7 +708,7 @@ DEPENDENCIES
   rspec-collection_matchers (~> 1.1)
   rspec-github (~> 2.4)
   rspec-rails (~> 3.9)
-  rubocop (= 1.22.1)
+  rubocop (= 1.22.3)
   rubocop-rails (~> 2.8)
   rubocop-rake (~> 0.6.0)
   rubocop-rspec (~> 2.0)

app/models/forms/export.rb

@@ -133,6 +133,7 @@ def to_xls
           # convert question types
           qtype_converted = QTYPE_TO_XLS[q.qtype_name]
 
+          # TODO if there's an option set then os_name has to be replaced with level name
           type_to_push = "#{qtype_converted} #{os_name}"
 
           # Write the question row
@@ -154,8 +155,13 @@ def to_xls
       # Choices
       # return an array to write to the spreadsheet
       option_matrix = options_to_xls(option_sets_used)
-      # Loop through matrix array and write to options spreadsheet
-      # options.row(...)
+
+      # Loop through matrix array and write to "choices" tab of the XLSForm
+      option_matrix.each_with_index do | option_row, row_index |
+        option_row.each_with_index do | row_to_write, column_index |
+          choices.row(row_index).push(row_to_write)
+        end
+      end
       # note: also need to split questions with option set levels into multiple questions, one for each level, and increment the row_index accordingly
 
       # Settings
@@ -262,7 +268,7 @@ def options_to_xls(option_sets)
 
             if node.children.present?
               # push to header row
-              unless header_row.contains?(node.level.name)
+              unless header_row.include?(node.level.name)
                 header_row.push(node.level.name)
               end
             else
@@ -282,7 +288,6 @@ def options_to_xls(option_sets)
 
       # Prepend header row
       os_matrix.insert(0, header_row)
-      Rails.logger.debug(os_matrix)
     end
   end
 end