Auto correct rubocop style issues

db/migrate/007_create_article_prices.rb

@@ -16,7 +16,7 @@ class CreateArticlePrices < ActiveRecord::Migration[4.2]
     puts 'add prices to the sample articles'
     CreateArticles::SAMPLE_ARTICLE_NAMES.each do |a|
       puts 'Create Price for article ' + a
-      raise 'article #{a} not found!' unless article = Article.find_by_name(a)
+      raise "article #{a} not found!" unless article = Article.find_by_name(a)
 
       new_price = ArticlePrice.new(:clear_price => rand(4) + 1,
                                    :tax => 7.0,

db/migrate/20130718183101_migrate_user_settings.rb

@@ -16,7 +16,7 @@ class MigrateUserSettings < ActiveRecord::Migration[4.2]
         begin
           user = type.constantize.find(id)
         rescue ActiveRecord::RecordNotFound
-          Rails.logger.debug "Can't find configurable object with type: #{type.inspect}, id: #{id.inspect}"
+          Rails.logger.debug { "Can't find configurable object with type: #{type.inspect}, id: #{id.inspect}" }
           next
         end
 
@@ -27,7 +27,7 @@ class MigrateUserSettings < ActiveRecord::Migration[4.2]
 
         # prepare value
         value     = YAML.load(old_setting.value)
-        value     = value.nil? ? false : value
+        value     = false if value.nil?
 
         # set the settings_attributes (thanks to settings.merge! we can set them one by one)
         user.settings_attributes = {

db/migrate/20171002000000_create_financial_links.rb

@@ -4,7 +4,10 @@ class CreateFinancialLinks < ActiveRecord::Migration[4.2]
       t.text :note
     end
 
-    add_column :financial_transactions, :financial_link_id, :integer, index: true
-    add_column :invoices, :financial_link_id, :integer, index: true
+    add_column :financial_transactions, :financial_link_id, :integer
+    add_column :invoices, :financial_link_id, :integer
+
+    add_index :financial_transactions, :financial_link_id
+    add_index :invoices, :financial_link_id
   end
 end