fetchStarredUser(onchange) {
  const self1 = this
  const myUserId = self1.state.userId
  var onValueChange1 = firebase.database().ref('/users/' + myUserId + '/starred_users').on('value', function(snapshot) {
    const starred_users = [];
    snapshot.forEach(function(childSnapshot) {
      starred_users.push(childSnapshot.val())
      console.log(childSnapshot.val())
    })
    self1.setState({
      starred_users: starred_users
    }, function() {
      if (onchange) onchange();
    });
  });
  this.setState({
    off_starred_user: onValueChange1
  })
}

fetchStarredUserPosts() {
  const self2 = this
  const posts = [];
  const stateStarredUsers = this.state.starred_users
  console.log("Hello")
  for (var i = 0; i < stateStarredUsers.length; i++) {
    const starredUser = stateStarredUsers[i]
    console.log(starredUser)
    firebase.database().ref('/users/' + starredUser + '/user_posts/').limitToFirst(1).once('value', function(snapshot) {
      console.log(snapshot.val())
      snapshot.forEach(function(childSnapshot) {
        posts.push(childSnapshot.val())
        self2.setState({
          posts: posts
        });
      })
    });
  }
}

fetchStarAll() {
  const self = this
  this.fetchStarredUser(function() {
    self.fetchStarredUserPosts()
  })
}