ruby – dynamic_matchers.rb：55：在`method_missing’中：未定

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:rubyrails_projectsdemo_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

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_amount+ is actually <tt>find_all_by_amount(amount,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