fix dropped column

db/migrations/20180415160405_message_types.js

 
 exports.up = async function(knex, Promise) {
-  await knex.schema.dropTable('posts');
-  await knex.schema.table('messages', function(table){    
-    table.dropColumn('authors');
-  });
-  await knex.schema.createTable('private_post', function(table){
-    table.inherits('messages');
-    table.string('author_uid', 128).notNullable();
-    table.enum('author_db', ['ldap']).notNullable().defaultTo('ldap');
-    table.string('recipient_uid', 128).notNullable();
-  });
-  await knex.schema.createTable('question', function(table){
-    table.inherits('messages');
-    table.string('author_uid', 128).notNullable();
-    table.enum('author_db', ['ldap']).notNullable().defaultTo('ldap');
-    table.string('recipient_uid', 128).notNullable();
-  });
-  await knex.schema.createTable('answer', function(table){
-    table.inherits('messages');
-    table.string('author_uid', 128).notNullable();
-    table.string('recipient_uid', 128).notNullable();
-    table.string('for_question', 128).notNullable();
-  });
-  return;
+    await knex.schema.dropTable('posts');
+    await knex.schema.table('messages', function(table){    
+        table.dropColumn('authors');
+    });
+    await knex.schema.createTable('private_post', function(table){
+        table.inherits('messages');
+        table.string('author_uid', 128).notNullable();
+        table.enum('author_db', ['ldap']).notNullable().defaultTo('ldap');
+        table.string('recipient_uid', 128).notNullable();
+    });
+    await knex.schema.createTable('question', function(table){
+        table.inherits('messages');
+        table.string('author_uid', 128).notNullable();
+        table.enum('author_db', ['ldap']).notNullable().defaultTo('ldap');
+        table.string('recipient_uid', 128).notNullable();
+    });
+    await knex.schema.createTable('answer', function(table){
+        table.inherits('messages');
+        table.string('author_uid', 128).notNullable();
+        table.string('recipient_uid', 128).notNullable();
+        table.string('for_question', 128).notNullable();
+    });
+    await knex.schema.table('events', function(table){
+        table.specificType('authors', knex.raw('varchar(128)[]'));
+    });
+    await knex.schema.table('announcements', function(table){
+        table.specificType('authors', knex.raw('varchar(128)[]'));
+    });
+    return;
 };
 
 exports.down = async function(knex, Promise) {