rails destroy scaffold leaves back table - ruby-on-rails

Question

I created a new scaffold using the command:
rails generate scaffold level
But then I destroyed it using the command
rails destroy scaffold level
And then again added it back using the command
rails generate scaffold level question:string answer:string prev_q:integer next_q:integer
But now when I try rake db:migrate then I get the following error
SQLite3::SQLException: table "levels" already 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 do |t|
t.string :question
t.string :answer
t.integer :prev_q
t.integer :next_q
t.timestamps
end
end
end
But my schema.rb is:
create_table "levels", :force => true do |t|
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
I want to know that how can I update the levels table in the schema. Also I would like to know that why doesn't the table get deleted when I destroy the scaffold. Do I need to run another command to do it?

Answer 1

Using destroy scaffold does not run the rollback to the migration. The correct way of doing it would have been
rake db:rollback
rails destroy scaffold level
now, as you don't have that other migration anymore, you cannot roll it back. You'll need to delete that table manually:
rails dbconsole
DROP TABLE levels;

Answer 2

What I had to do was:
First I followed the steps specified by #Alex Siri.
But after doing that using
rake db:migrate
Did not add the values question,answer etc to the table, so I did the following steps
I again deleted the scaffold using the command
rails destroy scaffold level
After that I again created the scaffold using the command:
rails generate scaffold level question:string answer:string prev_q:integer next_q:integer
Finally I ran migration using
rake db:migrate
This solved my problem. I wrote all the steps so that if anyone else has the same problem then they can easily solve it.