Getting 'query in command must target a single shard' - azure-cosmosdb

Question

I have a CosmosDB setup using the Mongo API. I have a collection with a hashed shard on one of the field of the document. When I run commands like db.collection.remove or db.collection.deleteMany I get the following error.
Command deleteMany failed: query in command must target a single shard key.: {"message":"Command deleteMany failed: query in command must target a single shard key."}
I'm not sure how can I mention a shard key as part of the query considering I want the query to run across all the shards.

Answer 1

You need to provide shard key when you want to run commands like db.collection.remove or db.collection.deleteMany.
For example :
My data source as below:
[
{
"id" : "2",
"name" : "b"
},
{
"id" : "1",
"name" : "a"
}
]
And my shared key is "/name". Use db.coll.deleteMany({"name":"a"}) to delete specific shard.
Hope it helps you.

Answer 2

It should be ShardKey which you have chosen when you created cosmosDb collection.
FilterDefinition<Product> filter = Builders<Product>.Filter.Eq("id", 2);
=== 2 is my shardKey
await this._dbContext.GetProducts.DeleteOneAsync(filter);
return RedirectToAction("Index");
Kindly refer an image below , how does it look like in CosmosDB

Answer 3

Shard Key(Partition Key) has to be provided during specification of schema model in the code. Once its provided, we can perform regular operation like save, update and delete as usual.
Example:
const mySchema = new Schema({
requestId: { type: String, required: true },
data: String,
documents: [{ docId: String, name: String, attachedBy: String }],
updatedBy: {
type: {
name: { type: String, required: true },
email: { type: String, required: true },
}, required: true
},
createdDate: { type: Date, required: true },
updatedDate: { type: Date },
}, { shardKey: { requestId: 1 } }
);
In the above code we specified requestId as Shard Key, now we can perform any mongo operations
Example:
let request:any = await myModel.findById(requestId);
request.data ="New Data";
await request.save();
Hope that helps.
This works with all Mongo operations