remove dead code.

The last call site of `last_version` was removed with:

838e18321118ee3ec6669217e5ea0216f79c969a

2 files changed, 1 insertions, 7 deletions

diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index f087a1eaa6..5bdb7213cd 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -941,10 +941,6 @@ module ActiveRecord
         migrations(migrations_paths).any?
       end
 
-      def last_version
-        last_migration.version
-      end
-
       def last_migration #:nodoc:
         migrations(migrations_paths).last || NullMigration.new
       end
diff --git a/activerecord/test/cases/migration_test.rb b/activerecord/test/cases/migration_test.rb
index 128a242495..10f1c7216f 100644
--- a/activerecord/test/cases/migration_test.rb
+++ b/activerecord/test/cases/migration_test.rb
@@ -75,15 +75,13 @@ class MigrationTest < ActiveRecord::TestCase
 
     ActiveRecord::Migrator.up(migrations_path)
     assert_equal 3, ActiveRecord::Migrator.current_version
-    assert_equal 3, ActiveRecord::Migrator.last_version
     assert_equal false, ActiveRecord::Migrator.needs_migration?
 
     ActiveRecord::Migrator.down(MIGRATIONS_ROOT + "/valid")
     assert_equal 0, ActiveRecord::Migrator.current_version
-    assert_equal 3, ActiveRecord::Migrator.last_version
     assert_equal true, ActiveRecord::Migrator.needs_migration?
 
-    ActiveRecord::SchemaMigration.create!(:version => ActiveRecord::Migrator.last_version)
+    ActiveRecord::SchemaMigration.create!(version: 3)
     assert_equal true, ActiveRecord::Migrator.needs_migration?
   ensure
     ActiveRecord::Migrator.migrations_paths = old_path