20170412active_records-editing

gistfile1.txt

Pre-release: Set up Database with Old Schema

$ bundle install
$ bundle exec rake db:create
$ bundle exec rake db:migrate

bundle exec rake generate:migration NAME=RemoveWeightFromDogs


class RemoveWeightFromDogs < ActiveRecord::Migration
  def change
    remove_column :dogs, :weight
  end
end

run that ... bundle exec rake db:migrate

bundle exec rake generate:migration NAME=AddBreedToDogs
add_column :breed

rails --generate migration add_breed_to_dogs breed:string

   add_column :dogs, :breed, :string
   add_index :dogs, :breed
    
has a integer column named judge_id (FAILED - 1)
no longer has a column named rater_id (FAILED - 2)

generate migration AddJudgeIdToRating judge_id:integer

lowercase id is important for constant error 


bundle exec rake generate:migration NAME=DeleteRaterIDFromRatings