deletes Manager

db/migrate/20151015135154_destroy_manager.rb

@@ -0,0 +1,16 @@
+class DestroyManager < ActiveRecord::Migration
+  def self.up
+    drop_table :managers
+  end
+
+  def self.down
+    create_table :managers do |t|
+      t.string :username, null: false
+      t.string :password_digest, null: false
+      t.timestamp :last_login_at
+      t.timestamps
+    end
+
+    add_index :managers, [:username]
+  end
+end