meta {
  name: grouped category
  type: http
  seq: 5
}

get {
  url: {{baseUrl}}/music-categories/:id/grouped
  body: none
  auth: inherit
}

params:path {
  id: 1
}

settings {
  encodeUrl: true
  timeout: 0
}

docs {
  A music category with each of its sub-categories, and each sub-category's playlists:
  { category: { id, title, description, image_url },
    sub_categories: [ { sub_category: { id, title, description, image_url }, playlists: [...] } ] }
}