定義されていないRailsメソッドupdate_attributes - ruby​​-on-rails、メソッド、マイグレーション、未定義、更新属性

次の移行ファイルがあります...

...目標は、データベース内のいくつかの名前属性を変更することです...

class UpdateActionableItemName < ActiveRecord::Migration

class InsightReportMenuItem < ActiveRecord::Base
self.table_name = "actionable_items"
attr_accessible :name
end

def up
#find all the rows to be updated
prescriber_activity_request = InsightReportMenuItem.where(name: "Prescriber Activity With Patient")
dispenser_activity_request = InsightReportMenuItem.where(name: "Dispenser Activity")
patient_history_request = InsightReportMenuItem.where(name: "Patient Request Activity")
debugger
#update row attributes
prescriber_activity_request.update_attributes(:name, "Prescriber Activity Request") if prescriber_activity_request
dispenser_activity_request.update_attributes(:name, "Dispenser Activity Request") if dispenser_activity_request
patient_history_request.update_attributes(:name, "Patient History Request") if patient_history_request
#save updates
prescriber_activity_request.save!
dispenser_activity_request.save!
patient_history_request.save!
end

def down
#find all the rows to be updated
prescriber_activity_request = InsightReportMenuItem.where(name: "Prescriber Activity Request")
dispenser_activity_request = InsightReportMenuItem.where(name: "Dispenser Activity Request")
patient_history_request = InsightReportMenuItem.where(name: "Patient History Request")
#update row attributes
prescriber_activity_request.update_attributes(:name, "Prescriber Activity With Request") if prescriber_activity_request
dispenser_activity_request.update_attributes(:name, "Dispenser Activity") if dispenser_activity_request
patient_history_request.update_attributes(:name, "Patient Request Activity") if patient_history_request
#save updates
prescriber_activity_request.save!
dispenser_activity_request.save!
patient_history_request.save!
end
end

...しかし、rake db：migrationを実行すると、エラーが発生します...

...ここで何が問題なのですか？

いくつかの異なるバージョンの構文を試しましたが、それでも同じバウンスバックエラーが発生します。

rake aborted!
An error has occurred, this and all later migrations canceled:

undefined method `update_attributes" for #<ActiveRecord::Relation:0x0000010e2e4d20>/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/relation/delegation.rb:45:in `method_missing"
/Users/kweihe/pmpaware-webapp/db/migrate/20150706132233_update_actionable_item_name.rb:15:in `up"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:410:in `block (2 levels) in migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:410:in `block in migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in `with_connection"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:389:in `migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:528:in `migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:720:in `block (2 levels) in migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:775:in `call"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:775:in `block in ddl_transaction"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/transactions.rb:208:in `transaction"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:775:in `ddl_transaction"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:719:in `block in migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `each"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:570:in `up"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/migration.rb:551:in `migrate"
/Users/kweihe/.rvm/gems/ruby-2.1.1/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:193:in `block (2 levels) in <top (required)>"

アップデート：解決済み

クエリの最後に.firstを追加しました

prescriber_activity_request = InsightReportMenuItem.where(name: "Prescriber Activity With Patient").first
dispenser_activity_request = InsightReportMenuItem.where(name: "Dispenser Activity").first
patient_history_request = InsightReportMenuItem.where(name: "Patient Request Activity").first

回答：

update_attributes 単一のインスタンスで呼び出す必要があります。

などの変数 prescriber_activity_request SQLクエリのラッパーであるリレーションです。たとえばに変更してみてください

    prescriber_activity_request.update_all(:name, "Prescriber Activity With Request") if prescriber_activity_request.size > 0