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    <p>You could patch your Ruby, but it's not easy and not really possible on managed hosts. My solution was to create a monkeypatch based on the patch commit 31075.</p> <p>Create an initializer file in your Rails project config/initializers/psych_extensions.rb and add this code:</p> <pre><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 &lt;&lt; { :foo =&gt; 'bar' } # builder.tree # =&gt; #&lt;Psych::Nodes::Stream .. } # class YAMLTree &lt; 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 =&gt; 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 </code></pre>
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