ruby - rails destroy scaffold leaves back table -

i created new scaffold using command:

rails generate scaffold level 

but destroyed using command

rails destroy scaffold level 

and again added using command

rails generate scaffold level question:string answer:string prev_q:integer next_q:integer 

but when try rake db:migrate following error

 sqlite3::sqlexception: table "levels" exists: create table "levels" ("id" integer primary key autoincrement not null, "question" varchar(255), "answer" varchar(255), "prev_q" integer, "next_q" integer, "created_at" datetime not null, "updated_at" datetime not null) 

my migrate/create_level.rb is

class createlevels < activerecord::migration def change   create_table :levels |t|   t.string :question   t.string :answer   t.integer :prev_q   t.integer :next_q    t.timestamps   end  end end 

but schema.rb is:

  create_table "levels", :force => true |t|     t.datetime "created_at", :null => false     t.datetime "updated_at", :null => false   end 

i want know how can update levels table in schema. know why doesn't table deleted when destroy scaffold. need run command it?

using destroy scaffold not run rollback migration. correct way of doing have been

rake db:rollback rails destroy scaffold level 

now, don't have other migration anymore, cannot roll back. you'll need delete table manually:

rails dbconsole drop table levels;