[BUG] Can't .findData() if queries exist for collection

[oceans404]

Describe the bug
The secretvaults-ts throws an error if you try to .findData() for a collection where queries exist.

How to reproduce

1. Clone blind-module-examples repo

git clone https://github.com/NillionNetwork/blind-module-examples.git

2. Navigate into sdk-examples https://github.com/NillionNetwork/blind-module-examples/tree/main/nildb/secretvaults-ts/sdk-examples and run the string query example - this creates a collection, creates queries, and runs queries successfully

npm run example:query-string

3. Add this code above the CLEANUP_AFTER_EXAMPLE block to try to read all records in collection

// this will fail to read records / find data because queries exist
const readRecords = await builderClient.findData({
  collection: collectionId,
  filter: {}, // Empty filter returns all records
 });
console.log('📋 Read records:', JSON.stringify(readRecords.data, null, 2));

4. Re-run run npm run example:query-string and see error from secretvaults-ts library:

TypeError: Do not know how to serialize a BigInt
    at JSON.stringify (<anonymous>)

Expected behavior
.findData() should return records even if queries exist

[tim-hm]

I could be missing something, but to me this looks like an issue with the JSON.stringify(readRecords.data) because the payload contains BigInts which JSON.stringify doesn't now how to deal with?

I can use a custom replacer with JSON.stringify to handle the BigInts and then the code runs without error:

const readRecords = await builderClient.findData({
  collection: collectionId,
  filter: {}, // Empty filter returns all records
});
const records = JSON.stringify(readRecords.data, (key, value) => {
    return typeof value === 'bigint' ? value.toString() + 'n' : value
 }, 2);
console.log('📋 Read records:', records);

And the console output:

📋 Read records: [
  {
    "_id": "9962f4d7-e65c-471a-8192-65f83f928d31",
    "name": "Frank Johnson",
    "phone_number": "555-0006",
    "country_code": "1n"
  },
  {
    "_id": "ab0ed59c-3f5c-4ec4-aef5-e5e9d444c59d",
    "name": "Eve Anderson",
    "phone_number": "555-0005",
    "country_code": "55n"
  },
  {
    "_id": "4c868eee-f4d1-44aa-b8f6-fd9a052e79db",
    "name": "Diana Prince",
    "phone_number": "555-0004",
    "country_code": "44n"
  },
  {
    "_id": "d6eba6c5-88c8-4885-acd8-7f737139fa94",
    "name": "Charlie Anderson",
    "phone_number": "555-0003",
    "country_code": "44n"
  },
  {
    "_id": "4f9d2d07-a4a9-4020-8b64-06c13eea73f4",
    "name": "Bob Smith",
    "phone_number": "555-0002",
    "country_code": "1n"
  },
  {
    "_id": "55473a6a-fdd2-44bf-9f68-c20e77506fa4",
    "name": "Alice Johnson",
    "phone_number": "555-0001",
    "country_code": "1n"
  }
]

Blindfold is returning a BigInt to your original country_code: { %allot: number }.