Array into metadata of vector

[MUSS-Davs]

Hi, in the example the code is like this:

var vectors = new[] { new Vector { Id = "vector1", Values = new float[] { 0.1f, 0.2f, 0.3f }, Metadata = new MetadataMap { ["genre"] = "horror", ["duration"] = 120 } } };

Now suppose I have a list of identifiers

List<string> idList = new() { "id1", "id2", "id3" };

How can i add this to the metadata?, I've try this:

var vectors = new[] { new Vector { Id = "vector1", Values = new float[] { 0.1f, 0.2f, 0.3f }, Metadata = new MetadataMap { ["genre"] = "horror", ["duration"] = 120, ["idList"] = idList } } };

but it doesn't work.
I need this for search with filters like: $in or $nin

[neon-sunset]

Hi @MUSS-Davs ,
This is a restriction due to how metadata operates in relation to C# being strongly typed. Because MetadataMap is a dictionary of string:MetadataValues, List<string> has to be converted to List<MetadataValue> which itself can be implicitly converted to MetadataValue node.

The way to deal with this is to map sequences / maps of your values to corresponding MetadataValues like this:

var idList = new List<string> { "id1", "id2", "id3" };

var metadata = new MetadataMap
{
    ["genre"] = "horror",
    ["duration"] = 120,
    ["idList"] = idList
        .Select(id => (MetadataValue)id)
        .ToArray()
};

var vector = new Vector
{
    Id = "vector1",
    Values = [0.1f, 0.2f, 0.3f],
    Metadata = metadata
};

[neon-sunset]

Since this is far from the first time the issue with metadata is raised, I've released an new version which should help with this: https://github.com/neon-sunset/Pinecone.NET/releases/tag/1.3.2