Correct way to store Json doc

Getting started with Redis
1

Hi,
what is the correct way to store a Json document and prevent duplicates?

doc = { “hash” : “fc02971b2415481499f7b5e376f4f582”, “abc”: “xyz” }

The “hash” value identifies the Json docs.

I’m uncertain how to to prevent storing the same Json doc multiple times.
I guess something like:

with r.pipeline() as pipe:
   while True:
      try:
         pipe.watch("article:index")
         id = int(pipe.incr("article:index"))
         if r.ft().search(Query("fc02971b2415481499f7b5e376f4f582").return_field("$.hash", as_field="hash")).docs:
            pipe.unwatch()
            break

         pipe.multi()
         pipe.json().set(f"article:{id}", Path.root_path(), dict(doc))
         pipe.execute()
    except WatchError:
         pass

Or should I use “hash” as key:

id = f"article:{hash}"

What is the preferred way to store Json docs and prevent duplicates?