Cannot delete item from CosmosDB

Question

I am trying to use an Azure Functions httpTrigger call to delete an item from my database.

import { CosmosClient,  } from '@azure/cosmos'

const httpTrigger: AzureFunction = async function (context: Context, req: HttpRequest): Promise<void> {
    const client = new CosmosClient(process.env.cosmosDB)
    const database = client.database('testDB');
    const container = database.container('workers');
    const item = container.item('28a31558-ff8c-40c3-a7e8-1e8904c5ff72', '/id')
    console.log(await item.delete())
}

I even tried to hardcode the values into the code (as you can see) but I will always get 404 not found error:

Executed 'Functions.worker-delete' (Failed, Id=81ab43cf-a223-48af-89e1-a15676346ef0)
System.Private.CoreLib: Exception while executing function: Functions.worker-delete. System.Private.CoreLib: Result: Failure
Exception: Error: Entity with the specified id does not exist in the system., 
RequestStartTime: 2020-05-11T12:30:44.4010890Z, RequestEndTime: 2020-05-11T12:30:44.4010890Z,  Number of regions attempted:1
ResponseTime: 2020-05-11T12:30:44.4010890Z, StoreResult: StorePhysicalAddress: xxx, LSN: 769914, GlobalCommittedLsn: 769914, PartitionKeyRangeId: 0, IsValid: True, StatusCode: 404, SubStatusCode: 0, RequestCharge: 1.24, ItemLSN: -1, SessionToken: -1#769914, UsingLocalLSN: False, TransportException: null, ResourceType: Document, OperationType: Delete
, Microsoft.Azure.Documents.Common/2.10.0
Stack: Error: Entity with the specified id does not exist in the system., 
RequestStartTime: 2020-05-11T12:30:44.4010890Z, RequestEndTime: 2020-05-11T12:30:44.4010890Z,  Number of regions attempted:1
ResponseTime: 2020-05-11T12:30:44.4010890Z, StoreResult: StorePhysicalAddress: xxx, LSN: 769914, GlobalCommittedLsn: 769914, PartitionKeyRangeId: 0, IsValid: True, StatusCode: 404, SubStatusCode: 0, RequestCharge: 1.24, ItemLSN: -1, SessionToken: -1#769914, UsingLocalLSN: False, TransportException: null, ResourceType: Document, OperationType: Delete
, Microsoft.Azure.Documents.Common/2.10.0
    at xxx/node_modules/@azure/cosmos/dist/index.js:6973:39
    at Generator.next (<anonymous>)
    at fulfilled (xxx/node_modules/tslib/tslib.js:110:62)
    at process._tickCallback (internal/process/next_tick.js:68:7).

I tripple checked:

• connection string
• database name
• container name
• item-id
• partition

Answer 1

When retrieving a document via container.item(), the two parameters are:

• document id
• partition key

The 2nd parameter (partition key) needs to be the value of the partition key. In your example, you had the path to the partition key instead, so it's checking for a partition key value of "/id":

const item = container.item('28a31558-ff8c-40c3-a7e8-1e8904c5ff72', '/id')

This needs to be changed to:

const item = container.item('28a31558-ff8c-40c3-a7e8-1e8904c5ff72', '<partition-key-value')