[SOLVED] FLUTTER, FIRESTORE : I have a streambuilder that returns a certain field from all the documents in the collection..how do I add query?

FLUTTER, FIRESTORE : I have a streambuilder that returns a certain field from all the documents in the collection..how do I add query?

I have a collection called todo and each document in todo contains the fields : task, boolean isDone, user_id, and task_id. Each user in my app has an ID so I only want to retrieve the tasks for their id. I have the code to retrieve the task field from all the documents but I want to query the collection so that I only retrieve the tasks for where the user_id=docid..docid is the variable i know.

body: StreamBuilder(
          stream: FirebaseFirestore.instance.collection('todo').snapshots(),
          builder: (context, snapshot) {
            return ListView.builder(
                itemCount: snapshot.data.docs.length,
                itemBuilder: (context, index) {
                  DocumentSnapshot course = snapshot.data.docs[index];
                  return ListTile(title: Text(course['task']));
                });
          },
        )

So I need help adding a query to this. I don't think i can use index anymore, though i am unsure . I am new to Flutter and Firestore so all the Streambuiler and Futurebuilder things haven't clicked yet. Please lmk if there any easy to understand references out there also.

Solution

You can add a query like so.

stream: FirebaseFirestore.instance
            .collection('todo')
            .where('user_id', isEqualTo: docid)
            .snapshots(),