如何正确调用selectCommoditiesByOwner查询？求可用调用示例

I've run into this exact issue before with Hyperledger Composer queries—when dealing with resource-type parameters like owner, you need to pass the full resource URI for the query to match correctly. Let me break down the working examples for different scenarios:

1. Calling the query in a transaction processor (JavaScript) #

If you're executing this query inside a transaction function, the cleanest way is to use the resource object's built-in toURI() method, which generates the properly formatted string the query expects:

/**
 * Sample transaction handler
 * @param {org.acme.biznet.YourSampleTransaction} tx The incoming transaction
 * @transaction
 */
async function handleSampleTransaction(tx) {
    // Assume your transaction includes an 'owner' reference to a Participant
    const targetOwner = tx.owner;

    // Set up query parameters with the full resource URI
    const queryArgs = {
        owner: targetOwner.toURI()
    };

    // Execute the query
    const matchingCommodities = await query('selectCommoditiesByOwner', queryArgs);

    // Work with the results
    console.log(`Retrieved ${matchingCommodities.length} commodities for ${targetOwner.email}`);
    // Add your business logic here
}

If you're fetching the owner from a registry instead of getting it from the transaction, you can also manually construct the URI:

// Get the participant registry first
const participantRegistry = await getParticipantRegistry('org.acme.biznet.Participant');
const targetOwner = await participantRegistry.get('john-doe-123'); // Use the owner's ID

// Manually build the resource URI
const queryArgs = {
    owner: `resource:${targetOwner.getFullyQualifiedIdentifier()}`
};

const matchingCommodities = await query('selectCommoditiesByOwner', queryArgs);

2. Calling the query via REST API #

If you're using the auto-generated Composer REST API, you need to pass the full resource URI as the parameter value:

GET Request #

Encode the URI and append it as a query parameter:

GET /api/queries/selectCommoditiesByOwner?owner=resource%3Aorg.acme.biznet.Participant%23john-doe-123

(Note: resource:org.acme.biznet.Participant#john-doe-123 is URL-encoded here)

POST Request #

Send the parameter in a JSON body:

{
    "owner": "resource:org.acme.biznet.Participant#john-doe-123"
}

Why your previous attempts didn't work #

Let's quickly cover why your earlier tries failed:

• Passing the owner object directly: Queries expect string values for resource parameters, not the object itself.
• owner.getFullyQualifiedIdentifier(): This returns the identifier without the resource: prefix, which the query needs to recognize it as a valid resource reference.
• If "resource:" + owner.getFullyQualifiedIdentifier() didn't work, double-check that the owner's fully qualified identifier includes the correct type (e.g., org.acme.biznet.Participant#john-doe-123—make sure the # and ID are present).

内容的提问来源于stack exchange，提问作者PPCM