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First try: using Sprintf mainRouteTable, err := ec2.LookupRouteTable(ctx, &ec2.LookupRouteTableArgs{ RouteTableId: pulumi.Sprintf("%s", vpc.MainRouteTableId), }) Error: cannot use pulumi.Sprintf("%s", vpc.MainRouteTableId) (value of type pulumi.StringOutput) as *string value in struct literal

I'm not familiar with the Pulumi Go SDK, but since the vpc.MainRouteTableId is an

Output

and the

ec2.LookupRouteTableArgs.RouteTableId

expects a string I think you need to perform the lookup inside the apply, something like:

mainRouteTable, err := vpc.MainRouteTableId.ApplyT(
    func (routeTableId string) (*LookupRouteTableResult, error) {
        return ec2.LookupRouteTable(ctx, &ec2.LookupRouteTableArgs{
            RouteTableId: routeTableId
        })
    }
)

Ok! Thank you! Still having a lot of issues but it looks like i'm getting closer assignment mismatch: 2 variables but vpc.MainRouteTableId.OutputState.ApplyT returns 1 values undefined: LookupRouteTableResult err is not a type cannot use routeTableId (type string) as type *string in field value

*LookupRouteTableResult

should probably be

*ec2.LookupRouteTableResult

, and yeah I think the ApplyT returns a single value, so it should just be

mainRouteTable := ...

Unfortunately I'm not that familiar with Go

Also quite new to Go, but i found out how to do it! It looks like that: mainRouteTable := vpc.MainRouteTableId.ApplyT( func (routeTableId string) (*ec2.LookupRouteTableResult, error) { return ec2.LookupRouteTable(ctx, &ec2.LookupRouteTableArgs{ RouteTableId: &routeTableId, }) }) Thank you for your help! I never tried to do it the other way around (lookup inside of the apply)