class <%= migration_class_name %> < ActiveRecord::Migration<%= migration_version %>

def change
  create_table :field_test_memberships do |t|
    t.string :participant_type
    t.string :participant_id
    t.string :experiment
    t.string :variant
    t.datetime :created_at
    t.boolean :converted, default: false
  end

  add_index :field_test_memberships, [:participant_type, :participant_id, :experiment],
    unique: true, name: "index_field_test_memberships_on_participant"
  add_index :field_test_memberships, [:experiment, :created_at]
end

end