db/migrate/20140625115202_create_users_star_projects.rb


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class CreateUsersStarProjects < ActiveRecord::Migration
  def change
    create_table :users_star_projects do |t|
      t.integer :project_id, null: false
      t.integer :user_id, null: false
      t.timestamps
    end
    add_index :users_star_projects, :user_id
    add_index :users_star_projects, :project_id
    add_index :users_star_projects, [:user_id, :project_id], unique: true

    add_column :projects, :star_count, :integer, default: 0, null: false
    add_index :projects, :star_count, using: :btree
  end
end