Rails 3.1 pre Migration problem

Question

Now i am upgrade the rails 3.0.7 to rails 3.1 pre version. When i am creating a sample project it works fine. After creating a scaffold i am try to migrate, but it gives me the rake aborted! message.

Here my code

rails g scaffold product name:string price:decimal category:string
      invoke  active_record
      create    db/migrate/20110517090853_create_products.rb
      create    app/models/product.rb
      invoke    test_unit
      create      test/unit/product_test.rb
      create      test/fixtures/products.yml
       route  resources :products
      invoke  scaffold_controller
      create    app/controllers/products_controller.rb
      invoke    erb
      create      app/views/products
      create      app/views/products/index.html.erb
      create      app/views/products/edit.html.erb
      create      app/views/products/show.html.erb
      create      app/views/products/new.html.erb
      create      app/views/products/_form.html.erb
      invoke    test_unit
      create      test/functional/products_controller_test.rb
      invoke    helper
      create      app/helpers/products_helper.rb
      invoke      test_unit
      create        test/unit/helpers/products_helper_test.rb
      create  app/assets/stylesheets/scaffold.css.scss
      invoke  assets
      create    app/assets/javascripts/products.js.coffee
      create    app/assets/stylesheets/products.css.scss
rake db:migrate
==  CreateProducts: migrating =================================================
-- create_table(:products)
   -> 0.0053s
==  CreateProducts: migrated (0.0054s) ========================================

rake aborted!
An error has occurred, all later migrations canceled:

undefined method `rows' for nil:NilClass

(See full trace by running task with --trace)

I am using ruby 1.9.2 and xampp.

Can any one know what is the problem?

Answer 1

I had the same problem using mysql2 v0.2.6 as database adapter.
I've tried to solve it updating mysql2 to latest version 0.3.2, but I could not compile this gem on Windows. But I still believe that recent version of mysql2 might work. Currently I use "pg" gem as postgres adapter for DB and it works fine with Rails 3.1.pre