class CreateProblems < ActiveRecord::Migration[4.2] def self.up create_table :problems, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci" do |t| t.column :name, :string, :limit => 30 t.column :full_name, :string t.column :full_score, :integer t.column :date_added, :date t.column :available, :boolean end end def self.down drop_table :problems end end