How to convert object {__ob__: Observer}?

Question

firebase

Good evening.
Please tell me how to solve the following problem

export default {
  data() {
    return {
      locations: [],
      posts: [],
      page: 1,
      perPage: 10,
      pages: []
    };
  },
  firestore() {
    <b>return {
      locations: db.collection("testTask")  Здесь приходят данные из БД в читаемом виде 
    };</b>
  },
  computed: {
    displayedPosts() {
      return this.paginate(this.posts);
    }
  },
  methods: {
    getPosts() {
      this.posts = [];
      this.pages = [];
      <b>const data = this.locations;   </b>  <--- здесь объект превращается в {__ob__: Observer}
      console.log(data);
      for (let i = 0; i < data.length; i++) {
        this.posts.push({
          title: data[i].title,
          id: i + 1,
          index: i
        });
      }
    },

Some data comes from the database, and if the locations are immediately substituted and sorted out in the markup, then everything works as it should.
But the data needs to be passed through methods, because there is pagination. As far as I understand, the same observer observer is attached to the object there, and then it is not possible to disassemble it into components.