Add distributors to admin product forms

app/models/spree/product_decorator.rb

@@ -2,7 +2,7 @@ Spree::Product.class_eval do
   belongs_to :supplier
   has_and_belongs_to_many :distributors
 
-  attr_accessible :supplier_id
+  attr_accessible :supplier_id, :distributor_ids
 
   validates_presence_of :distributors
 end

app/overrides/add_distributor_to_product.rb

@@ -0,0 +1,9 @@
+Deface::Override.new(:virtual_path  => "spree/admin/products/_form",
+            :insert_top  => "[data-hook='admin_product_form_right']",
+            :partial       => "spree/admin/products/distributors",
+            :name          => "distributors")
+
+Deface::Override.new(:virtual_path  => "spree/admin/products/new",
+            :insert_bottom  => ".left",
+            :partial       => "spree/admin/products/distributors",
+            :name          => "distributors")

app/views/spree/admin/products/_distributors.html.haml

@@ -0,0 +1,5 @@
+= f.field_container :distributors do
+  = f.label :distributors
+  %br
+  = f.collection_check_boxes(:distributor_ids, Spree::Distributor.all, :id, :name)
+  = f.error_message_on :distributors