NoMethodError保存記錄

Question

節省payment request當時（未定義的方法`aasm_state'），有一個錯誤彈出：

NoMethodError (undefined method `aasm_state' for #<PaymentRequestx::PaymentRequest:0x007f574d229df8>): 
    activemodel (4.2.0) lib/active_model/attribute_methods.rb:433:in `method_missing' 
    aasm (4.11.0) lib/aasm/persistence/base.rb:36:in `aasm_read_state' 
    aasm (4.11.0) lib/aasm/instance_base.rb:12:in `current_state' 
    aasm (4.11.0) lib/aasm/persistence/active_record_persistence.rb:233:in `aasm_invalid_state?' 
    aasm (4.11.0) lib/aasm/persistence/active_record_persistence.rb:225:in `block in aasm_validate_states' 
    aasm (4.11.0) lib/aasm/persistence/active_record_persistence.rb:223:in `each' 
    aasm (4.11.0) lib/aasm/persistence/active_record_persistence.rb:223:in `aasm_validate_states' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:427:in `block in make_lambda' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:189:in `call' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:189:in `block in simple' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:92:in `call' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:92:in `_run_callbacks' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_validate_callbacks' 
    activemodel (4.2.0) lib/active_model/validations.rb:395:in `run_validations!' 
    activemodel (4.2.0) lib/active_model/validations/callbacks.rb:113:in `block in run_validations!' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:88:in `call' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:88:in `_run_callbacks' 
    activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_validation_callbacks' 
    activemodel (4.2.0) lib/active_model/validations/callbacks.rb:113:in `run_validations!' 
    activemodel (4.2.0) lib/active_model/validations.rb:334:in `valid?' 
    activerecord (4.2.0) lib/active_record/validations.rb:58:in `valid?' 
    activerecord (4.2.0) lib/active_record/validations.rb:83:in `perform_validations' 
    activerecord (4.2.0) lib/active_record/validations.rb:37:in `save' 
    activerecord (4.2.0) lib/active_record/attribute_methods/dirty.rb:21:in `save' 
    activerecord (4.2.0) lib/active_record/transactions.rb:286:in `block (2 levels) in save' 
    activerecord (4.2.0) lib/active_record/transactions.rb:347:in `block in with_transaction_returning_status' 
    activerecord (4.2.0) lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction' 
    activerecord (4.2.0) lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction' 
    activerecord (4.2.0) lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction' 
    activerecord (4.2.0) lib/active_record/transactions.rb:220:in `transaction' 
    activerecord (4.2.0) lib/active_record/transactions.rb:344:in `with_transaction_returning_status' 
    activerecord (4.2.0) lib/active_record/transactions.rb:286:in `block in save' 
    activerecord (4.2.0) lib/active_record/transactions.rb:301:in `rollback_active_record_state!' 
    activerecord (4.2.0) lib/active_record/transactions.rb:285:in `save' 
    /home/ubuntu/.rvm/gems/ruby-2.2.4/bundler/gems/payment_requestx-7836ca37b30f/app/controllers/payment_requestx/payment_requests_controller.rb:45:in `create' 

在payment_requests_controller.rb保存時出現的錯誤：

if @payment_request.save 

在此之前， ，成功保存了payment request。寶石AASM有什麼問題？

Answer 1

Make sure you've added AASM需要遷移的列。