Getting this error:

{
  "level": 50,
  "time": 1727061558607,
  "pid": 34285,
  "hostname": "Zestsystems-MacBook-Pro.local",
  "err": {
    "type": "ImportError",
    "message": "0 documents imported successfully, 1 documents failed during import. Use `error.importResults` from the raised exception to get a detailed error reason for each document.",
    "stack": "ImportError: 0 documents imported successfully, 1 documents failed during import. Use `error.importResults` from the raised exception to get a detailed error reason for each document.\n    at ImportError.TypesenseError [as constructor] (/Users/mikeyim/projects/work/utc/node_modules/typesense/lib/Typesense/Errors/TypesenseError.js:23:28)\n    at new ImportError (/Users/mikeyim/projects/work/utc/node_modules/typesense/lib/Typesense/Errors/ImportError.js:25:28)\n    at Documents.<anonymous> (/Users/mikeyim/projects/work/utc/node_modules/typesense/lib/Typesense/Documents.js:154:39)\n    at step (/Users/mikeyim/projects/work/utc/node_modules/typesense/lib/Typesense/Documents.js:48:23)\n    at Object.next (/Users/mikeyim/projects/work/utc/node_modules/typesense/lib/Typesense/Documents.js:29:53)\n    at fulfilled (/Users/mikeyim/projects/work/utc/node_modules/typesense/lib/Typesense/Documents.js:20:58)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)",
    "name": "ImportError",
    "importResults": [
      {
        "code": 400,
        "document": "{\"id\":\"65OhIDFEa1QQdVqyoiX2n\",\"name\":\"Awesome Duo\",\"imageUrl\":null,\"size\":2,\"battlerId\":\"icXdIXHSZhAsu8XYMRQI0\",\"createdAt\":\"1727054133\",\"updatedAt\":\"1727054133\",\"isDeleted\":false,\"members\":[{\"id\":\"jUHsJXvZc5_iRYS25n5Cn\",\"teamId\":\"65OhIDFEa1QQdVqyoiX2n\",\"position\":\"Leader\",\"inviteStatus\":\"Accepted\",\"userId\":\"ReslWXNd8UDVy4bkmP1h0\",\"dancer\":{\"id\":\"UipZeQKJPjKilUUoimsSA\",\"userId\":\"ReslWXNd8UDVy4bkmP1h0\",\"battlerId\":\"c5dTrKcIc2s-ITfUvzNFg\",\"username\":\"mikeyimfb\",\"imageUrl\":null,\"nationality\":\"KR\",\"createdAt\":\"1727053829\",\"updatedAt\":\"1727054343793\",\"isDeleted\":false}},{\"id\":\"hUEV0wprXe77xiErLpj0J\",\"teamId\":\"65OhIDFEa1QQdVqyoiX2n\",\"position\":\"Member\",\"inviteStatus\":\"Pending\",\"userId\":\"kUW8XapcgRxpt7eyKVHk8\",\"dancer\":{\"id\":\"YgvcGnXGAI7Oce_QGiuwD\",\"userId\":\"kUW8XapcgRxpt7eyKVHk8\",\"battlerId\":\"_SYSdbsTsSo249We4AlRW\",\"username\":\"facebookmike\",\"imageUrl\":null,\"nationality\":null,\"createdAt\":\"1726979136\",\"updatedAt\":\"1726979136\",\"isDeleted\":false}}],\"leaderUsername\":\"mikeyimfb\"}",
        "error": "Field `members.dancer.nationality` must be an array of string.",
        "success": false
      }
    ]
  },
  "msg": "0 documents imported successfully, 1 documents failed during import. Use `error.importResults` from the raised exception to get a detailed error reason for each document."
}

The schema for team:

team: {
            name: 'team',
            num_documents: 0,
            enable_nested_fields: true,
            fields: [
                { name: 'name', type: 'string' },
                { name: 'leaderUsername', type: 'string' },
                { name: 'imageUrl', type: 'string', optional: true },
                { name: 'size', type: 'int32' },
                { name: 'members', type: 'object[]' },
            ] as const,
        },

What could be an issue? I thought the issue would be because the value of members.dancer.nationality being null but members.dancer.imageUrl should be null as well 🤔

It mainly has to do with how you defined your schema. You specified members as an array of objects, without defining any sub fields for the

members

array, resulting in Typesense using

auto

for whatever type you pass in for the sub fields from then on. When you first pass a nationality for the first imported documents, Typesense expects each subsequent member to include a string nationality (it says it expects a string array because members is an array). You would have to manually define your members schema underneath it accordingly e.g.

{ name: "members.nationality", type: "string[]", "optional": true}

@Fanis Tharropoulos I think its axios not omitting null value. I have cleared the collection and still getting the issue. I have axios resolved to "0.26.1" because newer version of axios within typesense-instantsearch-adapter preventing react native to build. There should be a help thread that I made in the past you can reference (i don't have pro) new schema:

team: {
            name: 'team',
            num_documents: 0,
            enable_nested_fields: true,
            fields: [
                { name: 'name', type: 'string' },
                { name: 'leaderUsername', type: 'string' },
                { name: 'imageUrl', type: 'string', optional: true },
                { name: 'size', type: 'int32' },
                { name: 'members', type: 'object[]' },
                { name: "members.dancer.imageUrl", type: "string[]", "optional": true},
                { name: "members.dancer.nationality", type: "string[]", "optional": true},
            ] as const,
        },

I'll check it out and try to find a fix for it

Ok I discovered the cause of the issue. When I upgrade to yarn-berry the resolution field in package.json starts to work and pins axios to v0.26.1. If I remove the resolution field and yarn install again I get axios v1.7.7 which works fine without breaking. Now the issue is will using the latest version of axios without the resolution field cause my typesense-instantsearch-adapter to break my react native project (this was the fix for the last help thread)