category_ids attribute missing while searching for products via REST API (rest/V1/products)

Question

The response does not have the "category_ids" key. I need this key. Is there any other API which can provide this key?

  "id": 10,
  "sku": "Nike 3 color half sleeve tshirt",
  "name": "Nike 3 color half sleeve tshirt",
  "attribute_set_id": 4,
  "price": 0,
  "status": 1,
  "visibility": 4,
  "type_id": "configurable",
  "created_at": "2015-12-01 23:05:47",
  "updated_at": "2015-12-25 00:22:27",
  "weight": 2,
  "product_links": [],
  "options": [],
  "tier_prices": [],
  "custom_attributes": [
    {
      "attribute_code": "description",
      "value": "<p>Nike summer wear hal sleeve tshirt in 3 colors</p>"
    },
    {
      "attribute_code": "meta_title",
      "value": "Nike 3 color half sleeve tshirt"
    },
    {
      "attribute_code": "meta_keyword",
      "value": "Nike 3 color half sleeve tshirt"
    },
    {
      "attribute_code": "meta_description",
      "value": "Nike 3 color half sleeve tshirt <p>Nike summer wear hal sleeve tshirt in 3 colors</p>"
    },
    {
      "attribute_code": "image",
      "value": "/p/w/pwp_sheet2.jpeg"
    },
    {
      "attribute_code": "small_image",
      "value": "/p/w/pwp_sheet2.jpeg"
    },
    {
      "attribute_code": "thumbnail",
      "value": "/p/w/pwp_sheet2.jpeg"
    },
    {
      "attribute_code": "options_container",
      "value": "container2"
    },
    {
      "attribute_code": "required_options",
      "value": "1"
    },
    {
      "attribute_code": "has_options",
      "value": "1"
    },
    {
      "attribute_code": "url_key",
      "value": "nike-3-color-half-sleeve-tshirt"
    },
    {
      "attribute_code": "tax_class_id",
      "value": "2"
    },
    {
      "attribute_code": "vendor",
      "value": "Paxcel Cloth House"
    }
  ]

Answer 1

category_ids is not joined when list of products is loaded. There are two options to get it:

1. Get list of product IDs, then load each one separately (when requesting GET rest/V1/products/:sku, category_ids attribute is loaded)
2. Add plugin for \Magento\Catalog\Api\ProductRepositoryInterface::getList which will populate it