Hello Pulumi people! After using Terraform for a while, I just discovered Pulumi and trying out if it's worth migrating! I though encountered an issue with the input/output concept, and the documentation is not enough for me to be unstuck. Let me explain: I would like to do a base setup of our AWS infrastructure, using Go language. I started up by creating a VPC with pulumi and AWS sdk. Then, I wanted to grab the main route table id from that VPC (the one created by default), to associate more routes to it. I failed miserably at that step.

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)