I have an ordered array containing external user ids. I want to upload this array to a mongo aggregation pipeline, then iterate through every element and perform a query on each element by filtering where the document external user id equals the element. How do I do this.
Here is an example of some documents:
{
_id: 0ao8feub0aoleuc
externalId: aaaaaaaa
}
{
_id: 93084u98aoegu9
externalId: bbbbbbb
}
{
_id: fdhcfidgcfyid8
externalId: ccccc
}
I have an array, formed client side, that is [aaaaaaaa, ccccc]. I want to retrieve the documents with external Ids that match the array elements, but I want them to come back in the order of the array, so the order of the external ids are aaaaaaaa, ccccc.
The reason I want to do this is so I can then limit the number of documents returned.
