Rails4无法用has_many-association保存对象

Question

问题解决！看起来“ChangedAttribute”不允许作为关联的名称。

我有一个使用Rails和ActiveLdap的应用程序。 在LDAP中更新记录之后，我想在数据库中添加相应的EmployeeChange记录。 EmployeeChange-model与ChangedAttribute-model具有has_many关联。

def update 
    # write changes to LDAP 
    @employee = Employee.find(params[:id]) 
    @employee.attributes = params[:employee].permit(:sn, :gn, :telephoneNumber, :physicalDeliveryOfficeName) 
    changes = @employee.changed_attributes 
    if @employee.save then 
     #when writing successful 
     employeeChange = EmployeeChange.new(:employee_cn => @employee.cn, :user_id => current_user.id) 
     employeeChange.save 
    end 
    respond_to do |format| 
     format.js 
    end 
    end 

的EmployeeChange级

class EmployeeChange < ActiveRecord::Base 
    has_many :changed_attributes 

    #ActiveLdap-Connection 
    def employee 
    Employee.find(employee_cn) 
    end 
end 

的ChangedAttribute级

class ChangedAttribute < ActiveRecord::Base 
    belongs_to :employee_change 
end 

但调用employeeChange.save时，轨失败，这个堆栈跟踪：

Started PATCH "/employees/d1037" for 10.0.2.2 at 2014-01-05 14:35:38 +0100 
Processing by EmployeesController#update as JS 
    Parameters: {"utf8"=>"✓", "employee"=>{"gn"=>"Hannes", "sn"=>"Linsen", "telephoneNumber"=>"T-1337", "physicalDeliveryOffice 
Name"=>""}, "id"=>"d1037"} 
    User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1 
    LDAP: search_with_limit (0.5ms): {:base=>"ou=Benutzer,dc=foo,dc=bar", :scope=>:sub, :filter=>"(&(cn=d1037)(objectClass=per 
son))", :attributes=>["*", "objectClass"], :limit=>1} 
    LDAP: modify (1.9ms): {:dn=>"cn=d1037,ou=Benutzer,dc=foo,dc=bar", :attributes=>[[:replace, "physicalDeliveryOfficeName", { 
"physicalDeliveryOfficeName"=>[]}]]} 
    (0.1ms) begin transaction 
    (0.1ms) rollback transaction 
Completed 500 Internal Server Error in 63ms 

NoMethodError - undefined method `keys' for #<ActiveRecord::Associations::CollectionProxy []>: 
    activerecord (4.0.2) lib/active_record/relation/delegation.rb:121:in `method_missing' 
    activerecord (4.0.2) lib/active_record/relation/delegation.rb:68:in `method_missing' 
    activerecord-deprecated_finders (1.0.3) lib/active_record/deprecated_finders/collection_proxy.rb:22:in `method_missing' 
    activemodel (4.0.2) lib/active_model/dirty.rb:112:in `changed' 
    activerecord (4.0.2) lib/active_record/attribute_methods/dirty.rb:84:in `keys_for_partial_write' 
    activerecord (4.0.2) lib/active_record/attribute_methods/dirty.rb:78:in `create_record' 
    activerecord (4.0.2) lib/active_record/callbacks.rb:306:in `block in create_record' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:373:in `_run__4122661215117885092__create__callbacks' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks' 
    activerecord (4.0.2) lib/active_record/callbacks.rb:306:in `create_record' 
    activerecord (4.0.2) lib/active_record/timestamp.rb:57:in `create_record' 
    activerecord (4.0.2) lib/active_record/persistence.rb:477:in `create_or_update' 
    activerecord (4.0.2) lib/active_record/callbacks.rb:302:in `block in create_or_update' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:383:in `_run__4122661215117885092__save__callbacks' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks' 
    activerecord (4.0.2) lib/active_record/callbacks.rb:302:in `create_or_update' 
    activerecord (4.0.2) lib/active_record/persistence.rb:106:in `save' 
    activerecord (4.0.2) lib/active_record/validations.rb:51:in `save' 
    activerecord (4.0.2) lib/active_record/attribute_methods/dirty.rb:32:in `save' 
    activerecord (4.0.2) lib/active_record/transactions.rb:270:in `block (2 levels) in save' 
    activerecord (4.0.2) lib/active_record/transactions.rb:326:in `block in with_transaction_returning_status' 
    activerecord (4.0.2) lib/active_record/connection_adapters/abstract/database_statements.rb:202:in `block in transaction' 
    activerecord (4.0.2) lib/active_record/connection_adapters/abstract/database_statements.rb:210:in `within_new_transaction' 
    activerecord (4.0.2) lib/active_record/connection_adapters/abstract/database_statements.rb:202:in `transaction' 
    activerecord (4.0.2) lib/active_record/transactions.rb:209:in `transaction' 
    activerecord (4.0.2) lib/active_record/transactions.rb:323:in `with_transaction_returning_status' 
    activerecord (4.0.2) lib/active_record/transactions.rb:270:in `block in save' 
    activerecord (4.0.2) lib/active_record/transactions.rb:281:in `rollback_active_record_state!' 
    activerecord (4.0.2) lib/active_record/transactions.rb:269:in `save' 
    app/controllers/employees_controller.rb:28:in `update' 
    actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
    actionpack (4.0.2) lib/abstract_controller/base.rb:189:in `process_action' 
    actionpack (4.0.2) lib/action_controller/metal/rendering.rb:10:in `process_action' 
    actionpack (4.0.2) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:423:in `_run__1739796840906245504__process_action__callbacks' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks' 
    actionpack (4.0.2) lib/abstract_controller/callbacks.rb:17:in `process_action' 
    actionpack (4.0.2) lib/action_controller/metal/rescue.rb:29:in `process_action' 
    actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' 
    activesupport (4.0.2) lib/active_support/notifications.rb:159:in `block in instrument' 
    activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    activesupport (4.0.2) lib/active_support/notifications.rb:159:in `instrument' 
    actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
    actionpack (4.0.2) lib/action_controller/metal/params_wrapper.rb:245:in `process_action' 
    activerecord (4.0.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    activeldap (4.0.1) lib/active_ldap/railties/controller_runtime.rb:18:in `process_action' 
    actionpack (4.0.2) lib/abstract_controller/base.rb:136:in `process' 
    actionpack (4.0.2) lib/abstract_controller/rendering.rb:44:in `process' 
    actionpack (4.0.2) lib/action_controller/metal.rb:195:in `dispatch' 
    actionpack (4.0.2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' 
    actionpack (4.0.2) lib/action_controller/metal.rb:231:in `block in action' 
    actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in `dispatch' 
    actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:48:in `call' 
    actionpack (4.0.2) lib/action_dispatch/journey/router.rb:71:in `block in call' 
    actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in `call' 
    actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:680:in `call' 
    warden (1.2.3) lib/warden/manager.rb:35:in `block in call' 
    warden (1.2.3) lib/warden/manager.rb:34:in `call' 
    rack (1.5.2) lib/rack/etag.rb:23:in `call' 
    rack (1.5.2) lib/rack/conditionalget.rb:35:in `call' 
    rack (1.5.2) lib/rack/head.rb:11:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/params_parser.rb:27:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/flash.rb:241:in `call' 
    rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context' 
    rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/cookies.rb:486:in `call' 
    activerecord (4.0.2) lib/active_record/query_cache.rb:36:in `call' 
    activerecord (4.0.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call' 
    activerecord (4.0.2) lib/active_record/migration.rb:369:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:373:in `_run__4410864778172765141__call__callbacks' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks' 
    actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/reloader.rb:64:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' 
    better_errors (1.1.0) lib/better_errors/middleware.rb:84:in `protected_app_call' 
    better_errors (1.1.0) lib/better_errors/middleware.rb:79:in `better_errors_call' 
    better_errors (1.1.0) lib/better_errors/middleware.rb:56:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
    railties (4.0.2) lib/rails/rack/logger.rb:38:in `call_app' 
    railties (4.0.2) lib/rails/rack/logger.rb:20:in `block in call' 
    activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `block in tagged' 
    activesupport (4.0.2) lib/active_support/tagged_logging.rb:25:in `tagged' 
    activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `tagged' 
    railties (4.0.2) lib/rails/rack/logger.rb:20:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
    rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' 
    rack (1.5.2) lib/rack/runtime.rb:17:in `call' 
    activesupport (4.0.2) lib/active_support/cache/strategy/local_cache.rb:83:in `call' 
    rack (1.5.2) lib/rack/lock.rb:17:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/static.rb:64:in `call' 
    rack (1.5.2) lib/rack/sendfile.rb:112:in `call' 
    railties (4.0.2) lib/rails/engine.rb:511:in `call' 
    railties (4.0.2) lib/rails/application.rb:97:in `call' 
    rack (1.5.2) lib/rack/lock.rb:17:in `call' 
    rack (1.5.2) lib/rack/content_length.rb:14:in `call' 
    rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service' 
    /usr/local/rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service' 
    /usr/local/rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run' 
    /usr/local/rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread' 

任何想法是什么问题可能是？

亲切的问候， 托比亚斯

Answer 1

变化

employeeChange = EmployeeChange.new(employee_cn = @employee.cn, user_id = current_user.id) 

要

employeeChange = EmployeeChange.new(:employee_cn => @employee.cn, :user_id => current_user.id)