Parts!

gistfile1.rb

Spree::Product.find(10).assembly?
  Spree::Product Load (0.9ms)  SELECT "spree_products".* FROM "spree_products" WHERE "spree_products"."id" = $1 LIMIT 1  [["id", 10]]
  Spree::Variant Load (0.9ms)  SELECT "spree_variants".* FROM "spree_variants" INNER JOIN "spree_assemblies_parts" ON "spree_variants"."id" = "spree_assemblies_parts"."part_id" WHERE "spree_assemblies_parts"."assembly_id" = 10
 => true 
 
Spree::Product.find(10).parts
  Spree::Product Load (1.1ms)  SELECT "spree_products".* FROM "spree_products" WHERE "spree_products"."id" = $1 LIMIT 1  [["id", 10]]
  Spree::Variant Load (0.7ms)  SELECT "spree_variants".* FROM "spree_variants" INNER JOIN "spree_assemblies_parts" ON "spree_variants"."id" = "spree_assemblies_parts"."part_id" WHERE "spree_assemblies_parts"."assembly_id" = 10
 => [#<Spree::Variant id: 14, sku: "C3", price: #<BigDecimal:7fd289b39148,'0.7495E2',18(18)>, weight: nil, height: nil, width: nil, depth: nil, deleted_at: nil, is_master: true, product_id: 12, count_on_hand: -425, cost_price: #<BigDecimal:7fd289b37ff0,'0.0',9(18)>, position: nil, course_id: nil>, 
 #<Spree::Variant id: 13, sku: "C55", price: #<BigDecimal:7fd289b373c0,'0.3295E2',18(18)>, weight: nil, height: nil, width: nil, depth: nil, deleted_at: nil, is_master: true, product_id: 11, count_on_hand: -1081, cost_price: #<BigDecimal:7fd286446af0,'0.0',9(18)>, position: nil, course_id: nil>] 
 
 Spree::AssembliesPart.all
  Spree::AssembliesPart Load (0.4ms)  SELECT "spree_assemblies_parts".* FROM "spree_assemblies_parts" 
 => [#<Spree::AssembliesPart assembly_id: 10, part_id: 14, count: 2>, 
 #<Spree::AssembliesPart assembly_id: 10, part_id: 13, count: 2>]