MultiChain Developer Q&A - Recent questions tagged keys-array

What is the syntax for an array of keys when using liststreamkeys (multichain 1.0.4)?

Fri, 27 Jul 2018 16:09:52 +0000

liststreamkeys allows the user to "Pass a single key in keys to retrieve information about one key only, pass an array for multiple keys, or * for all keys".

JSON syntax for an array is something like

{"name":"John",
"age":30,
"cars":[ "Ford", "BMW", "Fiat" ]

But when I've tried to pass in an array of keys to search with liststreamkeys, it thinks that I'm passing in the whole thing (curly brackets and all) as the key.

testChain: liststreamkeys teststream {"key":"1522317920788t1t63342t3t6tFILE_ACCESStMOD_FlyBase","key":"1522000002801t1t1t1t1tREQ_RESOURCEtMOD_UCSC_Genome_Bioinformatics"}

Here's the output:

[

{

"key" : "{key:1522317920788t1t63342t3t6tFILE_ACCESStMOD_FlyBase,key:1522000002801t1t1t1t1tREQ_RESOURCEtMOD_UCSC_Genome_Bioinformatics}",

"items" : 0,

"confirmed" : 0

}

]

I've also tried

testChain: liststreamkeys teststream ["1522317920788t1t63342t3t6tFILE_ACCESStMOD_FlyBase","1522000002801t1t1t1t1tREQ_RESOURCEtMOD_UCSC_Genome_Bioinformatics"]

Why are "keys" and "publishers" properties arrays

Tue, 15 May 2018 08:43:48 +0000

When I call liststreamitems it returns a list of objects like this:

       {
            "publishers": [
                "13hhTLheZXjFj5owddcBNMu2jnNPxvbUZrrnHx"
            ],
            "keys": [
                "ASDF"
            ],
            "data": "7b2274656d70223a31322c2268756d223a36357d",
            "confirmations": 25,
            "blocktime": 1526372965,
            "txid": "6c2e0eeee735233241081000bf06895482e1329eede1ac62d22ce4f11e38bec9"
        }

The keys property is an array, but I don't understand why, since I published this data to this particular key. Then I published more values to the same key, and to other keys and the keys property will never accumulate inside an array. Every published item is returned as separate object with only 1 value in the keys array.
Same goes for publishers.

What is the purpose behind them being an array?

Tell me one simple usecase for storing mutiple keys with json data

Thu, 25 Jan 2018 08:43:11 +0000

Hello Multichain team, I know this stream feature has come as enhancement on multichain 1.x version . what I am not able to understand is how to use multiple keys against json data ? can you please give a simple usecase where it helps .

MultiChain2.0 alfa issues on stream keys array and data-json

Fri, 08 Dec 2017 10:09:19 +0000

Cheching 2.0 alfa 1 release and try to write several keys with data-json structure instead a key and data-hex.

CLI help notifies this^

Arguments:
1. "from-address"                   (string, required) Address used for issuing.
2. "stream-identifier"              (string, required) Stream identifier - one of the following: stream txid, stream reference, stream name.
3. "key"                            (string, required) Item key
or
3. keys                             (array, required) Array of item keys
4. "data-hex"                       (string, required) Data hex string
or
4. data-json                        (object, required) JSON data object
    {
      "json" : data-json            (object, required) Valid JSON object
    }
or
4. data-text                        (object, required) Text data object
    {
      "text" : "data-text"          (string, required) Data string
    }

However any keys arrays variants came back as string and no way to send any data-json or data-text.

Please check this options work and send your variant of example.