add ability to call proc to set processing queue

lib/dalliance.rb

@@ -201,10 +201,18 @@ def pending_or_processing?
     pending? || processing?
   end
 
+  def processing_queue
+    if self.class.dalliance_options[:queue].respond_to?(:call)
+      self.class.instance_exec self, &dalliance_options[:queue]
+    else
+      self.class.dalliance_options[:queue]
+    end
+  end
+
   #Force backgound_processing w/ true
   def dalliance_background_process(backgound_processing = nil)
     if backgound_processing || (backgound_processing.nil? && self.class.dalliance_options[:background_processing])
-      self.class.dalliance_options[:worker_class].enqueue(self, self.class.dalliance_options[:queue])
+      self.class.dalliance_options[:worker_class].enqueue(self, processing_queue)
     else
       dalliance_process(false)
     end

spec/dalliance/dalliance_spec.rb

@@ -24,4 +24,30 @@
       expect(DallianceModel.human_attribute_name(:dalliance_status)).to eq ('Status')
     end
   end
+
+  context "processing_queue" do
+    before do
+      DallianceModel.dalliance_options[:queue] = queue
+    end
+
+    context "string" do
+      let(:queue) { 'dalliance_2'}
+
+      specify{ expect(subject.processing_queue).to eq(queue) }
+    end
+
+    context "proc" do
+      context "w/o args" do
+        let(:queue) { Proc.new{ 'dalliance_2' } }
+
+        specify{ expect(subject.processing_queue).to eq(queue.call) }
+      end
+
+      context "w/ args" do
+        let(:queue) { Proc.new{ |a,b,c| 'dalliance_2' } }
+
+        specify{ expect(subject.processing_queue).to eq(queue.call) }
+      end
+    end
+  end
 end