Don't rely on #as_json for delayed_job payload_object

This will avoid infinite loops with ActiveRecord class jobs.

Fix #369

lib/rollbar/plugins/delayed_job/job_data.rb

@@ -1,3 +1,5 @@
+require 'yaml'
+
 class JobData
   attr_reader :job
 
@@ -7,10 +9,23 @@ def initialize(job)
 
   def to_hash
     job_data = job.as_json
-    # Here job_data['handler'] is a YAML object comming
-    # from the storage backend
-    job_data['handler'] = job.payload_object.as_json
+    handler_parent = job_data['job'] ? job_data['job'] : job_data
+    handler_parent['handler'] = handler_data
 
     job_data
   end
+
+  private
+
+  def handler_data
+    object = job.payload_object.object
+
+    {
+      :method_name => job.payload_object.method_name,
+      :args => job.payload_object.args,
+      :object => object.is_a?(Class) ? object.name : object.to_s
+    }
+  rescue
+    {}
+  end
 end

spec/rollbar/plugins/delayed_job_spec.rb

@@ -69,7 +69,20 @@ def do_job_please!(a, b)
     end
 
     context 'with attempts > configuration.dj_threshold' do
-      let(:job) { double(:attempts => 6) }
+      let(:object) do
+        double(:to_s => 'foo')
+      end
+      let(:payload_object) do
+        double(:method_name => 'foo',
+               :args => [1, 2],
+               :object => object)
+      end
+      let(:job) do
+        double(
+          :attempts => 6,
+          :job => { :payload_object => payload_object }
+        )
+      end
 
       it 'returns true' do
         expect(described_class.skip_report?(job)).to be(false)