我使用Rails 4收到此错误： wrong number of arguments (0 for 1) 在控制器中运行此代码时： class CommentsController ApplicationController def create @comment = @current_user.comments.build(comment_params) if @comment.save r
wrong number of arguments (0 for 1)
在控制器中运行此代码时：
class CommentsController < ApplicationController
def create
@comment = @current_user.comments.build(comment_params)
if @comment.save
redirect_to :back, flash: { success: "Comment was updated." }
else
redirect_to :back, flash: { error: "There was an issue with your comment." }, comment: { content: params[:comment][:content] }
end
end
private
def comment_params
params.require(:comment).permit(:post_id, :content)
end
end
这是模型：
class Comment < ActiveRecord::Base belongs_to :post belongs_to :user validates_presence_of :content validates_length_of :attribute, minimum: 20 end
这是堆栈跟踪：
block in ActiveModel::Validations::LengthValidator#validate /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activemodel/lib/active_model/validator.rb, line 151 ActiveModel::Validations::LengthValidator#validate /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activemodel/lib/active_model/validator.rb, line 150 Comment#_callback_before_112 /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 281 Comment#_run__664310716__validate__callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 388 Comment#run_callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 78 Comment#run_validations! /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activemodel/lib/active_model/validations.rb, line 330 block in Comment#run_validations! /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activemodel/lib/active_model/validations/callbacks.rb, line 106 Comment#_run__664310716__validation__callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 374 Comment#run_callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 78 Comment#run_validations! /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activemodel/lib/active_model/validations/callbacks.rb, line 106 Comment#valid? /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activemodel/lib/active_model/validations.rb, line 271 Comment#valid? /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/validations.rb, line 70 Comment#perform_validations /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/validations.rb, line 78 Comment#save! /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/validations.rb, line 57 Comment#save! /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/attribute_methods/dirty.rb, line 41 block in Comment#save! /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/transactions.rb, line 275 block in Comment#with_transaction_returning_status /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/transactions.rb, line 326 block in ActiveRecord::ConnectionAdapters::PostgreSQLAdapter#transaction /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb, line 202 ActiveRecord::ConnectionAdapters::PostgreSQLAdapter#within_new_transaction /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb, line 210 ActiveRecord::ConnectionAdapters::PostgreSQLAdapter#transaction /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb, line 202 Comment.transaction /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/transactions.rb, line 209 Comment#with_transaction_returning_status /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/transactions.rb, line 323 Comment#save! /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/transactions.rb, line 275 CommentsController#create app/controllers/comments_controller.rb, line 4 CommentsController#send_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal/implicit_render.rb, line 4 CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/abstract_controller/base.rb, line 189 CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal/rendering.rb, line 10 block in CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/abstract_controller/callbacks.rb, line 18 CommentsController#_run__1046107247__process_action__callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 414 CommentsController#run_callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 78 CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/abstract_controller/callbacks.rb, line 17 CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal/rescue.rb, line 29 block in CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal/instrumentation.rb, line 31 block in ActiveSupport::Notifications.instrument /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/notifications.rb, line 158 ActiveSupport::Notifications::Instrumenter#instrument /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/notifications/instrumenter.rb, line 20 ActiveSupport::Notifications.instrument /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/notifications.rb, line 158 CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal/instrumentation.rb, line 30 CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal/params_wrapper.rb, line 245 CommentsController#process_action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/railties/controller_runtime.rb, line 18 CommentsController#process /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/abstract_controller/base.rb, line 136 CommentsController#process /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/abstract_controller/rendering.rb, line 44 CommentsController#dispatch /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal.rb, line 196 CommentsController#dispatch /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal/rack_delegation.rb, line 13 block in CommentsController.action /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_controller/metal.rb, line 232 ActionDispatch::Routing::RouteSet::Dispatcher#dispatch /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/routing/route_set.rb, line 80 ActionDispatch::Routing::RouteSet::Dispatcher#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/routing/route_set.rb, line 48 block in ActionDispatch::Journey::Router#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/journey/router.rb, line 69 ActionDispatch::Journey::Router#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/journey/router.rb, line 57 ActionDispatch::Routing::RouteSet#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/routing/route_set.rb, line 645 ClientSideValidations::Middleware::Validators#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/client_side_validations-6855ba7031d4/lib/client_side_validations/middleware.rb, line 21 Rack::ETag#call (gem) rack-1.5.2/lib/rack/etag.rb, line 23 Rack::ConditionalGet#call (gem) rack-1.5.2/lib/rack/conditionalget.rb, line 35 Rack::Head#call (gem) rack-1.5.2/lib/rack/head.rb, line 11 ActionDispatch::ParamsParser#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/params_parser.rb, line 27 ActionDispatch::Flash#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/flash.rb, line 241 ActionDispatch::Session::EncryptedCookieStore#context (gem) rack-1.5.2/lib/rack/session/abstract/id.rb, line 225 ActionDispatch::Session::EncryptedCookieStore#call (gem) rack-1.5.2/lib/rack/session/abstract/id.rb, line 220 ActionDispatch::Cookies#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/cookies.rb, line 452 ActiveRecord::QueryCache#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/query_cache.rb, line 36 ActiveRecord::ConnectionAdapters::ConnectionManagement#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb, line 632 ActiveRecord::Migration::CheckPending#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activerecord/lib/active_record/migration.rb, line 366 block in ActionDispatch::Callbacks#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/callbacks.rb, line 29 ActionDispatch::Callbacks#_run__81458556__call__callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 374 ActionDispatch::Callbacks#run_callbacks /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/callbacks.rb, line 78 ActionDispatch::Callbacks#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/callbacks.rb, line 27 ActionDispatch::Reloader#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/reloader.rb, line 64 ActionDispatch::RemoteIp#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/remote_ip.rb, line 76 BetterErrors::Middleware#protected_app_call (gem) better_errors-0.7.2/lib/better_errors/middleware.rb, line 84 BetterErrors::Middleware#better_errors_call (gem) better_errors-0.7.2/lib/better_errors/middleware.rb, line 79 BetterErrors::Middleware#call (gem) better_errors-0.7.2/lib/better_errors/middleware.rb, line 56 ActionDispatch::DebugExceptions#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb, line 17 ActionDispatch::ShowExceptions#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/show_exceptions.rb, line 30 Rails::Rack::Logger#call_app /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/rack/logger.rb, line 38 block in Rails::Rack::Logger#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/rack/logger.rb, line 21 block in ActiveSupport::Logger#tagged /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/tagged_logging.rb, line 67 ActiveSupport::Logger::SimpleFormatter#tagged /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/tagged_logging.rb, line 25 ActiveSupport::Logger#tagged /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/tagged_logging.rb, line 67 Rails::Rack::Logger#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/rack/logger.rb, line 21 ActionDispatch::RequestId#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/request_id.rb, line 21 Rack::MethodOverride#call (gem) rack-1.5.2/lib/rack/methodoverride.rb, line 21 Rack::Runtime#call (gem) rack-1.5.2/lib/rack/runtime.rb, line 17 ActiveSupport::Cache::Strategy::LocalCache::Middleware#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/activesupport/lib/active_support/cache/strategy/local_cache.rb, line 72 Rack::Lock#call (gem) rack-1.5.2/lib/rack/lock.rb, line 17 ActionDispatch::Static#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/actionpack/lib/action_dispatch/middleware/static.rb, line 64 Fourpointohblog::Application#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/engine.rb, line 511 Fourpointohblog::Application#call /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/application.rb, line 96 Rack::ContentLength#call (gem) rack-1.5.2/lib/rack/content_length.rb, line 14 block in Thin::Connection#pre_process (gem) thin-1.5.0/lib/thin/connection.rb, line 81 Thin::Connection#pre_process (gem) thin-1.5.0/lib/thin/connection.rb, line 79 Thin::Connection#process (gem) thin-1.5.0/lib/thin/connection.rb, line 54 Thin::Connection#receive_data (gem) thin-1.5.0/lib/thin/connection.rb, line 39 EventMachine.run (gem) eventmachine-1.0.3/lib/eventmachine.rb, line 187 Thin::Backends::TcpServer#start (gem) thin-1.5.0/lib/thin/backends/base.rb, line 63 Thin::Server#start (gem) thin-1.5.0/lib/thin/server.rb, line 159 Rack::Handler::Thin.run (gem) rack-1.5.2/lib/rack/handler/thin.rb, line 16 Rails::Server#start (gem) rack-1.5.2/lib/rack/server.rb, line 264 Rails::Server#start /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/commands/server.rb, line 83 block in <top (required)> /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/commands.rb, line 80 <top (required)> /home/user/.rvm/gems/ruby-1.9.3-p194/bundler/gems/rails-8744632fb564/railties/lib/rails/commands.rb, line 75 <main> script/rails, line 6 <main> script/rails, line 0
我试过调用以下内容但它们没有用
> @ coment.save！
> @ comment.save(@comment)
为什么会导致这个问题.
您不能在ActiveRecord模型中拥有一个名为attribute的列,因为attribute是ActiveRecord :: Base类的私有方法.更改列名以获取其他内容,它将起作用.