Auto correct rubocop style issues

lib/foodsoft_config.rb

@@ -158,7 +158,7 @@ class FoodsoftConfig
     # @return [Array<String>] Valid names of foodcoops.
     def foodcoops
       if config[:multi_coop_install]
-        APP_CONFIG.keys.reject { |coop| coop =~ /^(default|development|test|production)$/ }
+        APP_CONFIG.keys.grep_v(/^(default|development|test|production)$/)
       else
         [config[:default_scope]]
       end
@@ -189,7 +189,7 @@ class FoodsoftConfig
 
     # @return [Hash] Full configuration.
     def to_hash
-      keys.map { |k| [k, self[k]] }.to_h
+      keys.to_h { |k| [k, self[k]] }
     end
 
     # for using active_model_serializer in the api/v1/configs controller

lib/order_txt.rb

@@ -25,6 +25,6 @@ class OrderTxt
 
   # Helper method to test pdf via rails console: OrderTxt.new(order).save_tmp
   def save_tmp
-    File.open("#{Rails.root}/tmp/#{self.class.to_s.underscore}.txt", 'w') { |f| f.write(to_csv.force_encoding("UTF-8")) }
+    File.write("#{Rails.root}/tmp/#{self.class.to_s.underscore}.txt", to_csv.force_encoding("UTF-8"))
   end
 end

lib/render_csv.rb

@@ -34,7 +34,7 @@ class RenderCSV
   # Helper method to test pdf via rails console: OrderCsv.new(order).save_tmp
   def save_tmp
     encoding = @options[:encoding] || 'UTF-8'
-    File.open("#{Rails.root}/tmp/#{self.class.to_s.underscore}.csv", 'w') { |f| f.write(to_csv.force_encoding(encoding)) }
+    File.write("#{Rails.root}/tmp/#{self.class.to_s.underscore}.csv", to_csv.force_encoding(encoding))
   end
 
   # XXX disable unit to avoid encoding problems, both in unit and whitespace. Also allows computations in spreadsheet.

lib/render_pdf.rb

@@ -120,7 +120,7 @@ class RenderPDF < Prawn::Document
 
   # Helper method to test pdf via rails console: OrderByGroups.new(order).save_tmp
   def save_tmp
-    File.open("#{Rails.root}/tmp/#{self.class.to_s.underscore}.pdf", 'w') { |f| f.write(to_pdf.force_encoding("UTF-8")) }
+    File.write("#{Rails.root}/tmp/#{self.class.to_s.underscore}.pdf", to_pdf.force_encoding("UTF-8"))
   end
 
   # @todo avoid underscore instead of unicode whitespace in pdf :/