add json response to workflow_actions

app/controllers/hyrax/workflow_actions_controller.rb

@@ -3,16 +3,19 @@ class WorkflowActionsController < ApplicationController
     before_action :authenticate_user!
 
     def update
-      work = ActiveFedora::Base.find(params[:id])
+      @curation_concern = ActiveFedora::Base.find(params[:id])
       workflow_action_form = Hyrax::Forms::WorkflowActionForm.new(
         current_ability: current_ability,
-        work: work,
+        work: @curation_concern,
         attributes: workflow_action_params
       )
       if workflow_action_form.save
-        redirect_to [main_app, work], notice: "The #{work.human_readable_type} has been updated."
+        after_update_response
       else
-        render 'hyrax/base/unauthorized', status: :unauthorized
+        respond_to do |wants|
+          wants.html { render 'hyrax/base/unauthorized', status: :unauthorized }
+          wants.json { render_json_response(response_type: :unprocessable_entity, options: { errors: @curation_concern.errors }) }
+        end
       end
     end
 
@@ -21,5 +24,12 @@ def update
       def workflow_action_params
         params.require(:workflow_action).permit(:name, :comment)
       end
+
+      def after_update_response
+        respond_to do |wants|
+          wants.html { redirect_to [main_app, @curation_concern], notice: "The #{@curation_concern.human_readable_type} has been updated." }
+          wants.json { render 'hyrax/base/show', status: :ok, location: polymorphic_path([main_app, @curation_concern]) }
+        end
+      end
   end
 end

spec/controllers/hyrax/workflow_actions_controller_spec.rb

@@ -33,5 +33,23 @@
       put :update, params: { id: generic_work.to_param, workflow_action: { name: 'advance', comment: '' } }
       expect(response).to redirect_to(main_app.hyrax_generic_work_path(generic_work, locale: 'en'))
     end
+
+    context 'when responding to json' do
+      it 'will render :ok when the form is successfully saved' do
+        expect(form).to receive(:save).and_return(true)
+        sign_in(user)
+
+        put :update, params: { id: generic_work.to_param, workflow_action: { name: 'advance', comment: '' } }, format: :json
+        expect(response.status).to eq 200
+      end
+
+      it 'will render :unprocessable_entity when the form fails to save' do
+        expect(form).to receive(:save).and_return(false)
+        sign_in(user)
+
+        put :update, params: { id: generic_work.to_param, workflow_action: { name: 'advance', comment: '' } }, format: :json
+        expect(response.status).to eq 422
+      end
+    end
   end
 end