DDO Fields interactions

After creating DDO instance based on DDO's version, we can interact with the DDO fields through the following methods:

• getDDOFields() which returns DDO fields such as:

  • id: The Decentralized Identifier (DID) of the asset.

  • version: The version of the DDO.

  • metadata: The metadata describing the asset.

  • services: An array of services associated with the asset.

  • credentials: An array of verifiable credentials.

  • chainId: The blockchain chain ID where the asset is registered.

  • nftAddress: The address of the NFT representing the asset.

• getAssetFields() which returns Asset fields such as:

  • datatokens (optional): The datatokens associated with the asset.

  • indexedMetadata (optional): Encapsulates data about blockchain asset related event, NFT, stats (pricing of the asset, number of orders per asset), purgatory (if the asset belongs or not in the purgatory).

    • event (optional): The last event related to the asset.

    • nft (optional): Information about the NFT representing the asset.

    • purgatory (optional): Purgatory status of the asset, if applicable.

    • stats (optional): Statistical information about the asset (e.g., usage, views).Example of indexedMetadata

   indexedMetadata: {
     event: {
       txid: '0xceb617f13a8db82ba9ef24efcee72e90d162915fd702f07ac6012427c31ac952',
       block: 39326976,
       from: '0x0DB823218e337a6817e6D7740eb17635DEAdafAF',
       contract: '0xBB1081DbF3227bbB233Db68f7117114baBb43656',
       datetime: '2023-02-15T16:42:22'
     },
     nft: {
       address: '0xBB1081DbF3227bbB233Db68f7117114baBb43656',
       name: 'Ocean Data NFT',
       symbol: 'OCEAN-NFT',
       state: 0,
       tokenURI:
         'data:application/json;base64,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',
       owner: '0x0DB823218e337a6817e6D7740eb17635DEAdafAF',
       created: '2022-12-30T08:40:43'
     },
     purgatory: {
       state: false
     },
     stats: [
       {
           datatokenAddress: "0x34e84f653Dcb291838aa8AF8Be1E1eF30e749ba0",
           name: "BDT2",
           symbol: "DT2",
           serviceId: "1",
           orders: 5,
           prices: [
                       {  
                           type: "fixedrate", 
                           price: "1",
                           token:"0x967da4048cD07aB37855c090aAF366e4ce1b9F48",
                           contract: "freContractAddress", 
                           exchangeId:  "0x23434" 
                       }
                   ]
       }
     ]
   }

• getDDOData() which simply retruns as Record<string, any> the full DDO structure including DDO and Asset fields.

• getDid() which returns only the Decentralized Identifier (DID), as string, of the asset.

Usage of DDO Manager Functions

Now let's use DDO V4 example, DDOExampleV4 into the following javascript code, assuming @oceanprotocol/ddo-js has been installed as dependency before:

const { DDOManager } = require ('@oceanprotocol/ddo-js');

const ddoInstance = DDOManager.getDDOClass(DDOExampleV4);

// DDO V4
console.log('DDO V4 Fields: ', ddoInstance.getDDOFields());
// Individual fields access
console.log('DDO V4 chain ID: ', ddoInstance.getDDOFields().chainId);
console.log('DDO V4 Asset Fields: ', ddoInstance.getAssetFields());
console.log('DDO V4 Data: ', ddoInstance.getDDOData());
console.log('DDO V4 DID: ', ddoInstance.getDid());

// The same script can be applied on DDO V5 and deprecated DDO from `Instantiate DDO section`.

Execute script

node retrieve-ddo-fields.js