Flutter firebase: get data from subcollection

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In my app, person A makes a post in a collection called "ADS". Person B clicks on the post and clicks on the button to send a request to person A. This creates a subcollection called "REQUESTS".

I want that in the case where person B clicks on the same post again and and if a request has already been sent to that particular post, a Text should appear that a request has already been sent.

Any help please?

What I have tried:

This is what I'm trying to do but I'm not sure if I'm right.

Dart

final uid = FirebaseAuth.instance.currentUser!.uid;
    
StreamBuilder(
                      stream: FirebaseFirestore.instance
                          .collection("ADS")
                          .doc(widget.selectedAds?['Uid'] ?? "")//the doc 
                          // id here is the id of the user who made the post. 
                          // User B selects that post and makes the request
                          .collection("REQUESTS")
                          .snapshots(),
                      builder: (context, snapshot) {
                        if (snapshot.connectionState == 
                        ConnectionState.done && snapshot.hasData) {
                          return ListView.builder(
                              // shrinkWrap: true,
                              itemCount: snapshot.data!.docs.length,
                              itemBuilder: (context, index) {
                                final passengerId =
                                    snapshot.data!.docs[index].get("UID"); //This is the id of the currentUser who sent the request
                                passengerId == uid
                                    ? Text(
                                        "Request already sent",
                                        style: TextStyle(color: Colors.white),
                                      )
                                    : Text(
                                        "Send a request",
                                        style: TextStyle(color: Colors.white),
                                      );
                                return null;
                              });
                        } else {
                          return Text(
                            "No data found",
                            style: TextStyle(color: Colors.white),
                          );
                        }
                      })

Can anyone help me? You can change the entire code if that will help me. Thank you!

Posted 27-Aug-23 2:09am

EBENEZER OCANSEY

Updated 28-Aug-23 9:30am

Deeksha Shenoy

v2

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Andre Oosthuizen · Answer 1 · 2023-08-28T04:01:00

Your code is generally on the right track, I made small tweaks for you but as your code is now, you should be fine -

Dart

StreamBuilder(
  stream: FirebaseFirestore.instance
      .collection("ADS")
      .doc(widget.selectedAds?['Uid'] ?? "")
      .collection("REQUESTS")
      .snapshots(),
  builder: (context, snapshot) {
    if (snapshot.connectionState == ConnectionState.done && snapshot.hasData) {
      return ListView.builder(
        itemCount: snapshot.data!.docs.length,
        itemBuilder: (context, index) {
          final passengerId = snapshot.data!.docs[index].get("UID");
          if (passengerId == uid) {
            return Text(
              "Request already sent",
              style: TextStyle(color: Colors.white),
            );
          } else {
            return Text(
              "Send a request",
              style: TextStyle(color: Colors.white),
            );
          }
        },
      );
    } else {
      return Text(
        "No data found",
        style: TextStyle(color: Colors.white),
      );
    }
  },
)