remove the index on the foreign key of the translation table when the…

… table is dropped.

added tests and addition to test_helper - Thank you http://github.com/sgt

lib/globalize/model/active_record/translated.rb

@@ -107,6 +107,9 @@ def create_translation_table!(fields)
 
           def drop_translation_table!
             translation_table_name = self.name.underscore + '_translations'
+            self.connection.remove_index(
+              translation_table_name, "#{self.table_name.singularize}_id"
+            )
             self.connection.drop_table translation_table_name
           end
 

test/model/active_record/migration_test.rb

@@ -15,8 +15,10 @@ def setup
 
   test 'globalize table added' do
     assert !Post.connection.table_exists?( :post_translations )
+    assert !Post.connection.index_exists?( :post_translations, :post_id )
     Post.create_translation_table! :subject => :string, :content => :text
     assert Post.connection.table_exists?( :post_translations )      
+    assert Post.connection.index_exists?( :post_translations, :post_id )
     columns = Post.connection.columns( :post_translations )
     assert locale = columns.detect {|c| c.name == 'locale' }
     assert_equal :string, locale.type
@@ -34,10 +36,13 @@ def setup
 
   test 'globalize table dropped' do
     assert !Post.connection.table_exists?( :post_translations )
+    assert !Post.connection.index_exists?( :post_translations, :post_id )
     Post.create_translation_table! :subject => :string, :content => :text
-    assert Post.connection.table_exists?( :post_translations )      
+    assert Post.connection.table_exists?( :post_translations )
+    assert Post.connection.index_exists?( :post_translations, :post_id )
     Post.drop_translation_table!
     assert !Post.connection.table_exists?( :post_translations )
+    assert !Post.connection.index_exists?( :post_translations, :post_id )
   end
 
   test 'exception on untranslated field inputs' do

test/test_helper.rb

@@ -23,4 +23,14 @@ def assert_member(item, arr)
       arr.member? item
     end
   end
+end
+
+module ActiveRecord
+  module ConnectionAdapters
+    class AbstractAdapter
+      def index_exists?(table_name, column_name)
+        indexes(table_name).any? { |index| index.name == index_name(table_name, column_name) }
+      end
+    end
+  end
 end