How to Show Previous Pull Requests in a New Stack's PR Tab

When creating a new stack after a Pull Request (PR) is already open, you may notice the PR doesn't automatically appear in the stack's PR tab. Here are two methods to make the PR visible:

Method 1: Push an Update to the PR

The simplest solution is to push a minor update to the PR after the stack is created:

1. Make a trivial change to your code (such as adding a blank space)

2. Commit and push the change to the PR

3. The PR will now appear in the stack's PR tab

Method 2: Using a Policy with Comment Trigger

Alternatively, you can set up a policy that responds to specific PR comments:

1. Add the following policy snippet to your stack:

propose {
    input.pull_request.action == "commented"
    input.pull_request.comment == concat(" ", ["/spacelift", "plan", input.stack.id])
}

Once the policy is in place:

1. Go to your PR

2. Add a comment in the format: /spacelift plan <stack_id>

   • Reminder to replace <stack_id> with your actual stack ID.

This will trigger Spacelift to evaluate the PR and initiate a propose run for the stack, making the PR visible in the PR tab.