Files for http://mickzijdel.com/blog/2025-05-19-setting-up-a-debugger-for-ruby-on-rails-8

Gemfile

gem "rdbg" # Ruby debug integration
gem "foreman" # Necessary for the procfile to work

launch.json

// .vscode/launch.json
{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "rdbg",
      "name": "Run bin/dev & Attach with rdbg",
      "request": "attach",
      "preLaunchTask": "runBinDev",
      "localfs": true,
      "localfsMap": "${workspaceFolder}:${workspaceFolder}"
    },
    {
      "type": "rdbg",
      "name": "Attach with rdbg",
      "request": "attach",
      "localfs": true,
      "localfsMap": "${workspaceFolder}:${workspaceFolder}"
    },
  ]
}

Procfile.dev

web: RUBY_DEBUG_OPEN=TRUE RUBY_DEBUG_NONSTOP=TRUE rdbg --command --open --stop-at-load -- bundle exec bin/rails server

tasks.json

// .vscode/tasks.json
{
  "version": "2.0.0",
  "tasks": [
    {
      "label": "runBinDev",
      "type": "shell",
      "command": "bin/dev",
      "isBackground": true,
      "problemMatcher": [
        {
          "owner": "custom-rdbg-task",
          "pattern": [
            {
              "regexp": "^.*DEBUGGER: Debugger can attach.*$",
              "kind": "info",
              "file": 1,
              "location": 1,
              "message": 0
            }
          ],
          "background": {
            "activeOnStart": true,
            "beginsPattern": "^.*DEBUGGER: Debugger can attach.*$",
            "endsPattern": "^.*DEBUGGER: Debugger can attach.*$"
          }
        }
      ],
      "presentation": {
        "reveal": "always",
        "panel": "dedicated",
        "clear": true
      },
      "group": {
        "kind": "build",
        "isDefault": false
      }
    }
  // If you have other tasks, they would be here
  ]
}