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post.scala

val QueryType = ObjectType(
  "Query",
  fields[ShopRepository, Unit](
    Field("allProducts", ListType(ProductType),
      description = Some("Returns a list of all available products."),
      complexity = constantComplexity(200),
      resolve = _.ctx.allProducts
    ),
    Field("product", OptionType(ProductType),
      description = Some("Returns a product with specific `id`."),
      arguments = Argument("id", IntType) :: Nil,
      resolve = c => productsFetcher.defer(c.arg[ProductId]("id"))),
    Field("products", ListType(ProductType),
      description = Some("Returns a list of products for provided IDs."),
      arguments = Argument("ids", ListInputType(IntType)) :: Nil,
      resolve = c => productsFetcher.deferSeqOpt(c.arg[List[ProductId]]("ids"))
    ),
    Field("category", OptionType(CategoryType),
      description = Some("Returns a category with specific `id`."),
      arguments = Argument("id", IntType) :: Nil,
      resolve = c => categoriesFetcher.deferOpt(c.arg[CategoryId]("id"))),
    Field("categories", ListType(CategoryType),
      description = Some("Returns categories by provided ids"),
      arguments = Argument("ids", ListInputType(IntType)) :: Nil,
      complexity = constantComplexity(30),
      resolve = c => categoriesFetcher.deferSeqOpt(c.arg[List[CategoryId]]("ids"))
    ),
    Field("allCategories", ListType(CategoryType),
      description = Some("Returns a list of all available categories."),
      complexity = constantComplexity(250),
      resolve = _.ctx.allCategories
    )
  )
)