Need a reference to a Cognito user pool before it was created

1

Hi!

I’m trying to refactor my mono-service Stack to a multi-services Cross-Stack. First I have my ApiGatway created with this route:

functions:
  contact-creation:
    handler: handler.creation
    environment:
      USER_POOL:
        Ref: ${self:custom.stage}-ContactsCognitoUserPoolId
    events:
      - http:
          method: post
          path: contact
          cors:
            origins: ${self:custom.cors.${self:custom.stage}

In this route, USER_POOL is needed to update the cognito profile of the user.

In my deployment process, I need to create the ApiGateway before the Cognito user pool and identity pool because I specify the access in the identity pool like this:

- Effect: 'Allow'
                Action:
                  - 'execute-api:Invoke'
                Resource:
                  Fn::Join:
                    - ''
                    -
                      - 'arn:aws:execute-api:'
                      - Ref: AWS::Region
                      - ':'
                      - Ref: AWS::AccountId
                      - ':'
                      - 'Fn::ImportValue': ${self:custom.stage}-ApiGatewayRestApiId
                      - '/*'

When I trigger the deployment, I get this error:

The CloudFormation template is invalid: Template format error: Unresolved resource dependencies [dev-ContactsCognitoUserPoolId] in the Resources block of the template

Do I need to import the ressources in my ApiGateway service or I can stay with the Cognito completely separated from others services? How can I handle this correctly?

Thank you for your help!

2

Oh I just saw your other comment but you can see we split this service out in Part II of our guide. Here is an example: