1 files changed, 4 insertions, 7 deletions
diff --git a/activerecord/lib/active_record/schema_migration.rb b/activerecord/lib/active_record/schema_migration.rb
index b384529e75..8f0ab2b55b 100644
--- a/activerecord/lib/active_record/schema_migration.rb
+++ b/activerecord/lib/active_record/schema_migration.rb
@@ -9,7 +9,7 @@ module ActiveRecord
   class SchemaMigration < ActiveRecord::Base # :nodoc:
     class << self
       def primary_key
-        nil
+        "version"
       end
 
       def table_name
@@ -21,7 +21,7 @@ module ActiveRecord
       end
 
       def table_exists?
-        connection.table_exists?(table_name)
+        ActiveSupport::Deprecation.silence { connection.table_exists?(table_name) }
       end
 
       def create_table(limit=nil)
@@ -31,16 +31,13 @@ module ActiveRecord
 
           connection.create_table(table_name, id: false) do |t|
             t.column :version, :string, version_options
+            t.index  :version, unique: true, name: index_name
           end
-          connection.add_index table_name, :version, unique: true, name: index_name
         end
       end
 
       def drop_table
-        if table_exists?
-          connection.remove_index table_name, name: index_name
-          connection.drop_table(table_name)
-        end
+        connection.drop_table table_name, if_exists: true
       end
 
       def normalize_migration_number(number)