Commercetools - Use query predicates to filter on a collection attribute

I'd like to get all the Category items that have between their ancestors an ancestor with a certain "id".

Here is the JSON of one of the categories returned by GETting from /categories:

{
        "id": "4627f3b0-fe52-4cc6-b03e-3fd72e701342",
        "version": 1,
        "lastMessageSequenceNumber": 1,
        "createdAt": "2019-02-18T13:48:51.677Z",
        "lastModifiedAt": "2019-02-18T13:48:51.677Z",
        "lastModifiedBy": {
            "clientId": "_anonymous"
        },
        "createdBy": {
            "clientId": "_anonymous"
        },
        "key": "snowboard-gloves",
        "name": {
            "en": "Snowboard Gloves"
        },
        "slug": {
            "en": "snowboard-gloves"
        },
        "description": {
            "en": "Gloves specifically designed for snowboarding"
        },
        "ancestors": [
            {
                "typeId": "category",
                "id": "b27086d2-33f2-43c3-aad1-4c01b2b9a886"
            }
        ],
        "parent": {
            "typeId": "category",
            "id": "b27086d2-33f2-43c3-aad1-4c01b2b9a886"
        },
        "orderHint": "0.000016",
        "metaTitle": {
            "en": "Snowboard Gloves"
        },
        "metaDescription": {
            "en": "Gloves specifically designed for snowboarding"
        },
        "assets": []
    }

I'd like to call the /categories API with a where clause on ancestors[x].id = "b27086d2-33f2-43c3-aad1-4c01b2b9a886" but from the documentation I don't understand how I should write the query predicate.

Can anyone help me?

Solution

The query predicate follows the structure of the json response. Nested fields are accessed with () brackets.

Try this out

ancestors(id = "idb27086d2-33f2-43c3-aad1-4c01b2b9a886")