Add enum backsupport for old migration

db/migrate/006_create_pages.rb

@@ -20,6 +20,10 @@ def self.up
       t.column :created_on, :datetime
       t.column :position, :integer
       t.column :lock_version, :integer, :default => 0
+
+      # enum backsupport
+      t.column :status, :string, length: 10, default: :new
+      t.column :translation_status, :string, length: 10, default: :new
     end
   end
 

db/migrate/20110225022301_pages_have_status.rb

@@ -1,6 +1,6 @@
 class PagesHaveStatus < ActiveRecord::Migration[5.0]
   def self.up
-    unless Page.columns_hash['status']
+    unless column_exists?(:pages, :status)
       add_column :pages, :status, :string, :length => 10
     end
 

db/migrate/20150115152502_add_search_text_to_page.rb

@@ -7,7 +7,7 @@ def self.up
       # the following looks odd, but we want to skip the callbacks which are
       # usually fired by page.save! since we don't want phantom page versions
       # or deeds or interactions
-      page.update_columns({:search_text => page.search_text}) 
+      page.update_columns({:search_text => page.search_text})
     end
     # create new index
     execute "CREATE FULLTEXT INDEX pages_search_text_index ON pages (search_text);"

db/migrate/20170215134719_add_status_information.rb

@@ -1,18 +1,20 @@
 class AddStatusInformation < ActiveRecord::Migration[5.0]
   def change
-    #add needs review to work statistics
+    # add needs review to work statistics
     add_column :work_statistics, :needs_review, :integer
 
-    #add translation status to pages
-    add_column :pages, :translation_status, :string
+    # add translation status to pages
+    unless column_exists?(:pages, :translation_status)
+      add_column :pages, :translation_status, :string
+    end
 
-    #add translation columns to work statistics
+    # add translation columns to work statistics
     add_column :work_statistics, :translated_pages, :integer
     add_column :work_statistics, :translated_blank, :integer
     add_column :work_statistics, :translated_review, :integer
     add_column :work_statistics, :translated_annotated, :integer
 
-    #add ocr correction flag to work
+    # add ocr correction flag to work
     add_column :works, :ocr_correction, :boolean
   end