大佬教程收集整理的这篇文章主要介绍了ruby – dynamic_matchers.rb：55：在`method_missing’中：未定义的方法`migration_error =’表示ActiveRecord :: Base：Class(NoMethodError)，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
当我发出’rails generate scaffold用户名：String email：String’时,会出现此错误.任何想法如何解决这个问题？
C:\ruby\rails_projects\demo_app>rails generate scaffold User name:string email:s tring invoke active_record C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/act ive_record/dynamic_matchers.rb:55:in `method_missing': undefined method `migrati on_error=' for ActiveRecord::Base:Class (NoMethodError) from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3 .2.13/lib/active_record/railtie.rb:66:in `block (3 levels) in <class:railtie>' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3 .2.13/lib/active_record/railtie.rb:65:in `each' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3 .2.13/lib/active_record/railtie.rb:65:in `block (2 levels) in <class:railtie>' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `each' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3 .2.13/lib/active_record/base.rb:720:in `<top (required)>' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 3/lib/rails/generators/named_base.rb:166:in `pluralize_table_names?' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 3/lib/rails/generators/named_base.rb:114:in `table_name' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3 .2.13/lib/rails/generators/active_record/model/model_generator.rb:17:in `create_ migration_file' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/command.rb:27:in `run' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:120:in `invoke_command' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `block in invoke_all' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `each' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `map' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `invoke_all' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/group.rb:233:in `dispatch' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:109:in `invoke' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/group.rb:278:in `block in _invoke_for_class_method' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/sHell.rb:74:in `with_padding' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/group.rb:267:in `_invoke_for_class_method' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/group.rb:150:in `_invoke_from_option_orm' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/command.rb:27:in `run' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:120:in `invoke_command' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `block in invoke_all' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `each' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `map' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/invocation.rb:127:in `invoke_all' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/group.rb:233:in `dispatch' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thor-0.18.1/li b/thor/base.rb:439:in `start' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 3/lib/rails/generators.rb:171:in `invoke' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 3/lib/rails/commands/generate.rb:12:in `<top (required)>' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/dependencies.rb:251:in `require' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/dependencies.rb:251:in `block in require' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.13/lib/active_support/dependencies.rb:251:in `require' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 3/lib/rails/commands.rb:29:in `<top (required)>' from bin/rails:4:in `require' from bin/rails:4:in `<main>'
dynamic_matchers.rb
@H_993_4@module ActiveRecord module DynamicMatchers def respond_to?(method_id,include_private = falsE) if match = DynamicFinderMatch.match(method_id) return true if all_attributes_exists?(match.attribute_names) elsif match = DynamicScopeMatch.match(method_id) return true if all_attributes_exists?(match.attribute_names) end super end private # Enables dynamic finders like <tt>User.find_by_user_name(user_name)</tt> and # <tt>User.scoped_by_user_name(user_name). Refer to Dynamic attribute-based finders # section at the top of this file for more detailed information. # # It's even possible to use all the additional parameters to +find+. For example,the # full interface for +find_all_by_@R_489_10929@nt+ is actually <tt>find_all_by_@R_489_10929@nt(@R_489_10929@nt,options)</tt>. # # Each dynamic finder using <tt>scoped_by_*</tt> is also defined in the class after it # is first invoked,so that future attempts to use it do not run through method_missing. def method_missing(method_id,*arguments,&block) if match = (DynamicFinderMatch.match(method_id) || DynamicScopeMatch.match(method_id)) attribute_names = match.attribute_names super unless all_attributes_exists?(attribute_names) if !(match.is_a?(DynamicFinderMatch) && match.instantiator? && arguments.first.is_a?(Hash)) && arguments.size < attribute_names.size method_trace = "#{__FILE__}:#{__LINE__}:in `#{method_iD}'" BACktrace = [method_trace] + caller raise ArgumentError,"wrong number of arguments (#{arguments.sizE} for #{attribute_names.sizE})",BACktrace end if match.respond_to?(:scope?) && match.scope? self.class_eval <<-METHOD,__FILE__,__LINE__ + 1 def self.#{method_iD}(*args) # def self.scoped_by_user_name_and_password(*args) attributes = Hash[[:#{attribute_names.join(',:')}].zip(args)] # attributes = Hash[[:user_name,:password].zip(args)] # scoped(:conditions => attributes) # scoped(:conditions => attributes) end # end METHOD send(method_id,*arguments) elsif match.finder? options = if arguments.length > attribute_names.size arguments.extract_options! else {} end relation = options.any? ? scoped(options) : scoped relation.send :find_by_attributes,match,attribute_names,&block elsif match.instantiator? scoped.send :find_or_instantiator_by_attributes,&block end else super end end # Similar in purpose to +expand_hash_conditions_for_aggregates+. def expand_attribute_names_for_aggregates(attribute_names) attribute_names.map { |attribute_name| unless (aggregation = reflect_on_aggregation(attribute_name.to_sym)).nil? aggregate_mapping(aggregation).map do |field_attr,_| field_attr.to_sym end else attribute_name.to_sym end }.flatten end def all_attributes_exists?(attribute_names) (expand_attribute_names_for_aggregates(attribute_names) - column_methods_hash.keys).empty? end def aggregate_mapping(reflection) mapping = reflection.options[:mapping] || [reflection.name,reflection.name] mapping.first.is_a?(Array) ? mapping : [mapping] end end end显然,我创建的应用程序生成了一个旧的rails版本,即使我的rails版本设置为最近的版本. 3.2.13
因此我的config / application.rb文件与rails 3.2.13版本完全不同.替换application.rb文件后.错误是固定的.
要避免此错误,您可以使用rvm或pik,如果您是Windows用户来控制当前版本.您可以在创建新应用程序’rails 3.2.13 your_app’时指定rails版本,或卸载所有rails版本并只安装您需要的版本：
宝石卸载导轨
– 选择所有版本
gem install rails –version’= 3.2.13′
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