rosa-build/db/migrate/20120329182602_delete_categ...

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class DeleteCategories < ActiveRecord::Migration
def self.up
remove_column :projects, :category_id
drop_table :categories
end
def self.down
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create_table :categories, force: true do |t|
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t.string "name"
t.string "ancestry"
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t.integer "projects_count", default: 0, null: false
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t.datetime "created_at"
t.datetime "updated_at"
end
add_column :projects, :category_id, :integer
end
end