chore(v2): remove now unnecessary code parts

Signed-off-by: Tobias Gurtzick <magic@wizardtales.com>

Author: wzrdtales

lib/executors/versioned/v2.js

@@ -25,23 +25,6 @@ const execUnit = {
     };
   },
 
-  learn: (context, driver, file) => {
-    const _file = file.get();
-
-    const i = Learn.getInterface(
-      context._driver,
-      file,
-      driver,
-      context.internals
-    );
-
-    return _file.migrate(i, {
-      options: context.internals.safeOptions,
-      seedLink: context.seedLink,
-      dbm: context.internals.safeOptions.dbmigrate
-    });
-  },
-
   up: async function (context, driver, file) {
     const _file = file.get();
     const chain = new Chain(context._driver, file, driver, context.internals);
@@ -50,6 +33,10 @@ const execUnit = {
     chain.addChain(Migrate);
 
     await State.startMigration(context._driver, file, context.internals);
+    // startMigration - needs secondary instance since we can not afford to
+    // loose state and the transaction start will include these for roll back
+    // we will disable them probably at all from DDL when the driver does not
+    // explicitly signal DDL transaction support (like crdb)
     try {
       await _file.migrate(chain, {
         options: context.internals.safeOptions,
@@ -64,57 +51,16 @@ const execUnit = {
       throw err;
     }
     return Promise.promisify(context.writeMigrationRecord.bind(context))(file);
-    return execUnit.learn(context, driver, file);
-
-    return context.driver
-      .startMigration()
-      .then(() => {
-        const _file = file.get();
-
-        return _file.migrate(context.driver, {
-          options: context.internals.safeOptions,
-          seedLink: context.seedLink,
-          dbm: context.internals.safeOptions.dbmigrate
-        });
-      })
-      .then(() => {
-        return Promise.promisify(context.writeMigrationRecord.bind(context))(
-          file
-        );
-      })
-      .then(context.driver.endMigration.bind(context.driver));
+    // end migration, same as start migration
   },
 
   down: async function (context, driver, file) {
+    // start migration, see up comments
     await State.startMigration(context._driver, file, context.internals);
     await TranslateState(context._driver, file, driver, context.internals);
     await State.endMigration(context._driver, file, context.internals);
     return Promise.promisify(context.deleteMigrationRecord.bind(context))(file);
-
-    await _file.migrate(chain, {
-      options: context.internals.safeOptions,
-      seedLink: context.seedLink,
-      dbm: context.internals.safeOptions.dbmigrate
-    });
-    return Promise.promisify(context.deleteMigrationRecord.bind(context))(file);
-
-    return driver
-      .startMigration()
-      .then(() => {
-        const _file = file.get();
-
-        return _file.down(context.driver, {
-          options: context.internals.safeOptions,
-          seedLink: context.seedLink,
-          dbm: context.internals.safeOptions.dbmigrate
-        });
-      })
-      .then(() => {
-        return Promise.promisify(context.deleteMigrationRecord.bind(context))(
-          file
-        );
-      })
-      .then(context.driver.endMigration.bind(context.driver));
+    // end migration, see up comments
   }
 };
 

lib/methods/v2/statetravel.js

@@ -1,4 +1,3 @@
-const Promise = require('bluebird');
 const Shadow = require('../../driver/shadow');
 const State = require('../../state');
 const DEFAULT = {