Old Ruby error repeats in my Ruby on Rails application related to Class.create and delayed_job

Question

Error many months, here:

http://www.ruby-forum.com/topic/1094002

Two links in what the code shows are changing:

https://github.com/godfat/ruby/commit/f4e0e8f781b05c767ad2472a43a4ed0727a75708 https://github.com/godfat/ruby/commit/c7a6cf975d88828c2ed27d253f41c480f9b66ad6

I have Ruby 1.9.2 and rvm. I would put these changes in the appropriate files, but I do not know how to do this.

It worked a few days ago. I cannot execute Ruby on Rails commands, for example:

>> User.create :username => "a", :password => "a" 

Here is the error message:

 ArgumentError: wrong number of arguments(1 for 0) from /Users/RedApple/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:48:in `method' from /Users/RedApple/.rvm/rubies/ruby-1.9.2 p290/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:48:in `accept' from /Users/RedApple/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:36:in `<<' from /Users/RedApple/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych.rb:165:in `dump' from /Users/RedApple/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/core_ext.rb:13:in `psych_to_yaml' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/delayed_job-2.0.4/lib/delayed/backend/base.rb:57:in `payload_object=' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:2918:in `block in assign_attributes' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:2914:in `each' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:2914:in `assign_attributes' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:2787:in `attributes=' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:2477:in `initialize' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:725:in `new' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:725:in `create' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/delayed_job-2.0.4/lib/delayed/message_sending.rb:9:in `method_missing' from /Users/RedApple/S/app/models/user.rb:29:in `block in <class:User>' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-2.3.14/lib/active_support/callbacks.rb:182:in `call' ... 7 levels... from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/callbacks.rb:267:in `create_with_callbacks' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:2927:in `create_or_update' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/callbacks.rb:250:in `create_or_update_with_callbacks' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:2577:in `save' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/validations.rb:1089:in `save_with_validation' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/dirty.rb:79:in `save_with_dirty' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/transactions.rb:229:in `block in with_transaction_returning_status' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `transaction' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/transactions.rb:182:in `transaction' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/transactions.rb:228:in `with_transaction_returning_status' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/transactions.rb:196:in `block in save_with_transactions' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/transactions.rb:208:in `rollback_active_record_state!' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/transactions.rb:196:in `save_with_transactions' from /Users/RedApple/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-2.3.14/lib/active_record/base.rb:727:in `create' from (irb):1 from /Users/RedApple/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in `<main>'> 

Line 28-30 in user.rb:

 after_create do |user| user.delay( :priority => -15 ).seed end 

I am dead in water without it. Can anyone help?

Answer 1

Deferred Assignment and Ruby 1.9.2. The YAML (Psych) parser, unfortunately, is incompatible.

Go back to the previous YAML parser (Syck) by adding it to your config/application.rb , just below the Bundler.require call:

 YAML::ENGINE.yamler = "syck" if RUBY_VERSION >= "1.9.2" 

Answer 2

You can fix your Ruby, but this is not easy and not realistic on managed hosts. My solution was to create monkeypatch based on commit 31075 patch.

Create the initialization file in the Rails project config / Initializers / psych_extensions.rb and add this code:

 # APPLIES RUBY PATCH REVISION 31075 module Psych module Visitors ### # YAMLTree builds a YAML ast given a ruby object. For example: # # builder = Psych::Visitors::YAMLTree.new # builder << { :foo => 'bar' } # builder.tree # => #<Psych::Nodes::Stream .. } # class YAMLTree < Psych::Visitors::Visitor def accept target # return any aliases we find if node = @st[target.object_id] node.anchor = target.object_id.to_s return @emitter.alias target.object_id.to_s end if target.respond_to?(:to_yaml) loc = target.public_method(:to_yaml).source_location.first if loc !~ /(syck\/rubytypes.rb|psych\/core_ext.rb)/ unless target.respond_to?(:encode_with) if $VERBOSE warn "implementing to_yaml is deprecated, please implement \"encode_with\"" end target.to_yaml(:nodump => true) end end end if target.respond_to?(:encode_with) dump_coder target else send(@dispatch_cache[target.class], target) end end private # FIXME: remove this method once "to_yaml_properties" is removed def find_ivars target loc = target.public_method(:to_yaml_properties).source_location.first unless loc.start_with?(Psych::DEPRECATED) || loc.end_with?('rubytypes.rb') if $VERBOSE warn "#{loc}: to_yaml_properties is deprecated, please implement \"encode_with(coder)\"" end return target.to_yaml_properties end target.instance_variables end end end end