DelayedJob: How to solve the problem “Job failed to load”?

I am using Ruby on Rails 3.1.0 and DelayedJob. As many people on the web I get the "Job failed to load: uninitialized constant Syck::Syck" error, but I think I discovered at least what generates the error (in my case). I have an ActiveModel like the following:

class Contact include ActiveModel::Conversion include ActiveModel::Validations include ActiveModel::Dirty extend ActiveModel::Naming extend ActiveModel::Translation attr_accessor :full_name, :email, :subject, :message def initialize(attributes = {}) attributes.keys.each do |attr| instance_variable_set "@" + attr.to_s, attributes[attr.to_sym] end end validates_presence_of :full_name, :email, :subject, :message def persist @persisted = true end def persisted? false end end

The related controller action is:

def contact @contact = Contact.new(params[:contact]) if @contact.valid? ::Contact::Mailer.delay.contact(@contact) respond_to do |format| format.html { redirect_to root_path } end else respond_to do |format| format.html { render :action => :contact } end end end

I noted that my problem with the "famous"\"infamous" Job failed to load: uninitialized constant Syck::Syck happens only if I run the @contact.valid?. If I re-implement the above controller action like this:

def contact @contact = Contact.new(params[:contact]) ::Contact::Mailer.delay.contact(@contact) respond_to do |format| format.html { redirect_to root_path } end end

all work as expected: I don't get the error and the e-mail is successfully sent. In few words, when I run @contact.valid? inside the controller action (I can run that also without using the if ... else statement) it generates the Job failed to load error. I really do not understand this strange behavior related to the DelayedJob gem and the valid? method.

<strong>Why it happens? How can I solve the problem?</strong>


More info at DelayedJob: “Job failed to load: uninitialized constant Syck::Syck”



If I debug the @contact.errors in both <strong>cases</strong> using or not using the @contact.valid? method...

<strong>... when</strong> I use the @contact.valid? method (DelayedJob does not work) I get

#<ActiveModel::Errors:0x00000101759408 @base=#<Contact:0x000001017597f0 @full_name="Sample name", @email="foo@bar.com", @subject="Sample subject", @message="Sample message content.", @validation_context=nil, @errors=#<ActiveModel::Errors:0x00000101759408 ...>>, @messages={}>

<strong>... when</strong> I do not use the @contact.valid? method (DelayedJob works) I get

#<ActiveModel::Errors:0x00000101759408 @base=#<Contact:0x000001017597f0 @full_name="Sample name", @email="foo@bar.com", @subject="Sample subject", @message="Sample message content.", @errors=#<ActiveModel::Errors:0x00000101759408 ...>>, @messages={}>

Note that in the second case the @validation_context=nil is not present and that in both cases there is a "nested" <ActiveModel::Errors:0x0000010175940 ...> statement. <strong>Is that a bug?</strong>


I found a solution that works for me. You can redefine the 'Object#to_yaml_properties' method within your Contact class to only include the properties you need. And thus exclude the 'errors' variable.

def to_yaml_properties ['@full_name', '@email', '@subject', '@message'] end

Hope this helps.


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