AWS SAM, unable to dynamically change the CodeUri based on Variable

Question

I have different local directories for three different environments with differnet codes. I can map all other properties dynamically except the codeUri.
The current code below shows up an error "'CodeUri' requires Bucket and Key properties to be specified."

```
  AuditEventsToDynamo:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: !Sub 'AuditEventsToDynamo${ENV}'
      CodeUri: !Sub 'AuditEventsToDynamo${ENV}/'
      Handler: !Join [ "", ["AuditEventsToDynamo" ,!Ref "ENV",".lambda_handler"]]
      Runtime: python3.9
      Environment:
        Variables:
          DB_TABLE: !Ref DBTABLE
      Architectures:
        - arm64
```

The code is local, if I replace the CodeUri with a literal string, it works. Is there a workaround?

Steve Kinsman · Answer

What's the "literal string" you used that works, and what's the value of "ENV" when it fails?  If ENV is something like "Dev", "Prod" etc then the error makes sense - your CodeUri wouldn't have both a Bucket and Key specified.

AWS SAM, unable to dynamically change the CodeUri based on Variable

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