Posting image to a product using the magento REST API 2 gives returns HTTP 500 and error in exception.log

Question

I am trying to add an image to a product in Magento 2.1 via the REST API using the catalogProductAttributeMediaGalleryManagementV1 service. The request is a POST request to https://example.com/rest/V1/products/$000000000093/media where $000000000093 is the sku of the item I am trying to add the image to. The body of the request is

{
  "entry":{
     "types":[
        "image",
        "thumbnail",
        "small_image"
      ],
      "label":"Image",
      "media_type":"image",
      "disabled":false,
      "content":[
        {
          "type":"image\/jpeg",
          "name":"Test123.jpg",
          "base64_encoded_data":"\/9j\/4AAQSkZJRgABAQAA..."
        }
     ],
   "position":1,
   "file":"\/t\/e\/Test123.jpg"
 }
}

This returns a 500 code and checking the Magento exception.log you get the following error:

main.CRITICAL: exception 'LogicException' with message 'Property "0" does not have corresponding setter in class "Magento\Framework\Api\Data\ImageContentInterface".'

Answer 1

Look like you need to define content field as object, not array.

Try to use:

"content": {
    "type":"image\/jpeg",
    "name":"Test123.jpg",
    "base64_encoded_data":"\/9j\/4AAQSkZJRgABAQAA..."
},

Source: \Magento\Catalog\Api\Data\ProductAttributeMediaGalleryEntryInterface