content mapping in jq :: the filter maps each post to its slug, and the reverse filter reverts it

README.md

content mapping in jq :: the filter maps each post to its slug, and the reverse filter reverts it

data.json

{
  "content": [
    {
      "title": "first post",
      "slug": "one",
      "body": "The quick brown fox jumps over the lazy dog.",
      "author": "anon",
      "updated": "NaN"
    },
    {
      "title": "another one",
      "slug": "two",
      "body": "The second brown fox jumps over the lazy dog.",
      "author": "anon",
      "updated": "NaN"
    }
  ]
}

filter.jq

reduce .content[] as {$title, $slug, $body, $author, $updated} ({}; (.[$slug] += {$title, $body, $author, $updated}))

reversed-filter.jq

to_entries | map(.value += {slug:.key}) | {content:[.[].value]}

reversed-input.json

{
  "one": {
    "title": "first post",
    "body": "The quick brown fox jumps over the lazy dog.",
    "author": "anon",
    "updated": "NaN"
  },
  "two": {
    "title": "another one",
    "body": "The second brown fox jumps over the lazy dog.",
    "author": "anon",
    "updated": "NaN"
  }
}