Fix api admin serializers

app/serializers/api/admin/product_serializer.rb

@@ -7,8 +7,6 @@ module Api
                  :inherits_properties, :on_hand, :price, :import_date, :image_url,
                  :thumb_url, :variants
 
-      has_one :supplier, key: :producer_id, embed: :id
-
       def variants
         ActiveModel::ArraySerializer.new(
           object.variants,

app/serializers/api/admin/variant_serializer.rb

@@ -9,6 +9,7 @@ module Api
                  :price, :on_demand, :on_hand, :in_stock, :stock_location_id, :stock_location_name
 
       has_one :primary_taxon, key: :category_id, embed: :id
+      has_one :supplier, key: :producer_id, embed: :id
 
       def name
         if object.full_name.present?
@@ -31,7 +32,7 @@ module Api
       end
 
       def producer_name
-        object.product.supplier.name
+        object.supplier.name
       end
 
       def image

spec/serializers/api/admin/product_serializer_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe Api::Admin::ProductSerializer do
-  let(:product) { create(:simple_product) }
+  let(:product) { create(:simple_product, supplier_id: create(:supplier_enterprise).id) }
   let(:serializer) { described_class.new(product) }
 
   it "serializes a product" do