Add additional raise UnknownMigrationVersionError

Raise error on the movement of migrations
when the current migration does not exist.

Author: bogdanvlviv

activerecord/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Raise error `UnknownMigrationVersionError` on the movement of migrations
+    when the current migration does not exist.
+
+    *bogdanvlviv*
+
 *   Fix `bin/rails db:forward` first migration.
 
     *bogdanvlviv*

activerecord/lib/active_record/migration.rb

@@ -1105,18 +1105,20 @@ def migration_files(paths)
       def move(direction, migrations_paths, steps)
         migrator = new(direction, migrations(migrations_paths))
 
+        if current_version != 0 && !migrator.current_migration
+          raise UnknownMigrationVersionError.new(current_version)
+        end
+
         start_index =
           if current_version == 0
             0
           else
             migrator.migrations.index(migrator.current_migration)
           end
 
-        if start_index
-          finish = migrator.migrations[start_index + steps]
-          version = finish ? finish.version : 0
-          send(direction, migrations_paths, version)
-        end
+        finish = migrator.migrations[start_index + steps]
+        version = finish ? finish.version : 0
+        send(direction, migrations_paths, version)
       end
     end
 

railties/test/application/rake/migrations_test.rb

@@ -167,6 +167,37 @@ class AMigration < ActiveRecord::Migration::Current
         end
       end
 
+      test "raise error on any move when current migration does not exist" do
+        Dir.chdir(app_path) do
+          `bin/rails generate model user username:string password:string;
+           bin/rails generate migration add_email_to_users email:string;
+           bin/rails db:migrate
+           rm db/migrate/*email*.rb`
+
+          output = `bin/rails db:migrate:status`
+          assert_match(/up\s+\d{14}\s+Create users/, output)
+          assert_match(/up\s+\d{14}\s+\** NO FILE \**/, output)
+
+          output = `bin/rails db:rollback 2>&1`
+          assert_match(/rails aborted!/, output)
+          assert_match(/ActiveRecord::UnknownMigrationVersionError:/, output)
+          assert_match(/No migration with version number\s\d{14}\./, output)
+
+          output = `bin/rails db:migrate:status`
+          assert_match(/up\s+\d{14}\s+Create users/, output)
+          assert_match(/up\s+\d{14}\s+\** NO FILE \**/, output)
+
+          output = `bin/rails db:forward 2>&1`
+          assert_match(/rails aborted!/, output)
+          assert_match(/ActiveRecord::UnknownMigrationVersionError:/, output)
+          assert_match(/No migration with version number\s\d{14}\./, output)
+
+          output = `bin/rails db:migrate:status`
+          assert_match(/up\s+\d{14}\s+Create users/, output)
+          assert_match(/up\s+\d{14}\s+\** NO FILE \**/, output)
+        end
+      end
+
       test "migration status after rollback and redo without timestamps" do
         add_to_config("config.active_record.timestamped_migrations = false")
 
@@ -257,7 +288,6 @@ class TwoMigration < ActiveRecord::Migration::Current
            rm db/migrate/*email*.rb`
 
           output = `bin/rails db:migrate:status`
-          File.write("test.txt", output)
 
           assert_match(/up\s+\d{14}\s+Create users/, output)
           assert_match(/up\s+\d{14}\s+\** NO FILE \**/, output)