Deal with Schedule creation in its own controller

This way it can assign the order cycles to the schedule when this is
persisted. An OrderCycleSchedule (the join table) can't be created until
both schedule and order_cycle got an id.

Also, we do not call `#adapt_params` when creating the Schedule as that
assigns `order_cycle_ids` to `@object.attributes` thus, attempting to
create the OrderCycleSchedule without a schedule_id.

app/controllers/admin/schedules_controller.rb

@@ -3,7 +3,7 @@ require 'order_management/subscriptions/proxy_order_syncer'
 
 module Admin
   class SchedulesController < ResourceController
-    before_filter :adapt_params, only: [:create, :update]
+    before_filter :adapt_params, only: [:update]
     before_filter :check_editable_order_cycle_ids, only: [:create, :update]
     before_filter :check_dependent_subscriptions, only: [:destroy]
     create.after :sync_subscriptions
@@ -28,6 +28,25 @@ module Admin
       end
     end
 
+    def create
+      invoke_callbacks(:create, :before)
+      @object.attributes = permitted_resource_params
+      @object.save!
+
+      @object.order_cycle_ids = params[:order_cycle_ids]
+      if @object.save
+        invoke_callbacks(:create, :after)
+        flash[:success] = flash_message_for(@object, :successfully_created)
+        respond_with(@object) do |format|
+          format.html { redirect_to location_after_save }
+          format.js   { render layout: false }
+        end
+      else
+        invoke_callbacks(:create, :fails)
+        respond_with(@object)
+      end
+    end
+
     private
 
     def collection
@@ -95,11 +114,7 @@ module Admin
     end
 
     def permitted_resource_params
-      params.require(:schedule).permit(
-        :id,
-        :name,
-        order_cycle_ids: []
-      )
+      params.require(:schedule).permit(:id, :name)
     end
   end
 end