Question 120887 in Firebase Question posted in
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Firebase – How to use a specific path to write/read data to firestore in flutter

I wanted to use dynamic paths selected by the user in my app to access/write data to my db. Sort of like a file path that the user can type, Eg: "users/mike/age". Using this string, I need to fetch as well as write data to the path in the db. Is there any way this is possible??

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2

Answers


  1. 0

    Firebase works in a way like

    Collections/Documents/Collections/Documents …

    You can create a Document & Collection dynamically in firebase, But you can not fetch any collection if are not known the name of Collection.

    It means if there is a List of Documents in a Collection you can fetch the list by using its parent collection name but a List of Collection nested under a Document can not be fetched unless you are known to names.

    For Example,
    if there is a path users/mike/age. You can fetch users because you know that you created a Collection named users and all of its Documents like mike can also be fetched. But if you have not known the age of user. You cannot fetch it.

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  2. 0

    Kind of strange, but you could split the string then refactor with firebase path.

    String pathStr = 'users/mike/age';
List<String> list = pathStr.split('/'); //now we have a list with the fields.
var ref;
switch (list.length) {
  case 0:
    break;
  case 1:
    ref = FirebaseFirestore.instance.collection(list[0]);
    break;
  case 2:
    ref = FirebaseFirestore.instance.collection(list[0]).doc(list[1]);
    break;  
  case 3:
    ref = FirebaseFirestore.instance.collection(list[0]).doc(list[1]).collection(list[2]);
    break;    
  case 4:
    ref = FirebaseFirestore.instance.collection(list[0]).doc(list[1]).collection(list[2]).doc(list[3]);
    break;      
  default: ref = null;
}
//Do whatevar with the ref path.
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