var list = [
  { name: 'yo', status: "good", spec: {
    selector: {
      app: "reviews"
    }
  }},
  { user: 'wha',  status: "bad", spec: {
  selector: {
      app: "details",
      test: "yo"
    }
  }}
];

result = _.filter(list, ['spec.selector', {app:"details"}]);