how to pass ontap updated string to search document in firebase - flutter

Question

#override
Widget build(BuildContext context) {
return Scaffold(
key: scaffoldKey,
backgroundColor: FlutterFlowTheme.of(context).primaryBackground,
body: SafeArea(
child: GestureDetector(
onTap: () => FocusScope.of(context).requestFocus(_unfocusNode),
child: StreamBuilder<List<UsersRecord>>(
stream: queryUsersRecord(
queryBuilder: (usersRecord) =>
usersRecord.where('display_name', isEqualTo: usertag==""?"Nischal Nayak":usertag),
singleRecord: true,
),
builder: (context, snapshot) {
// Customize what your widget looks like when it's loading.
if (!snapshot.hasData) {
return Center(
child: SizedBox(
width: 38,
height: 38,
child: SpinKitThreeBounce(
color: FlutterFlowTheme.of(context).primaryColor,
size: 38,
),
),
);
}
List<UsersRecord> textUsersRecordList = snapshot.data!;
// Return an empty Container when the item does not exist.
if (snapshot.data!.isEmpty) {
return Container();
}
final textUsersRecord = textUsersRecordList.isNotEmpty
? textUsersRecordList.first
: null;
return InkWell(
onTap: () async {
logFirebaseEvent('TEST_PAGE_Text_i1by10in_ON_TAP');
logFirebaseEvent('Text_navigate_to');
context.pushNamed(
'Profile',
queryParams: {
'userref': serializeParam(
textUsersRecord!.reference,
ParamType.DocumentReference,
),
}.withoutNulls,
);
},
child: LinkifyText(
widget.text,
textStyle: TextStyle(
color: Colors.blue),
linkStyle: TextStyle(
color: widget.linkColor, fontSize: widget.fontSize),
onTap: (Link) {
if(Link.type == LinkType.url) {
_launchInBrowser(Uri(scheme: "https", host: Link.value),);
}else
if(Link.type == LinkType.userTag) {
setState(() {
usertag = Link.value!.substring(1);
});
}
} ,
),
);
},
),
),
),
);
}
}
how to pass Link.value to isEqualto in usersRecord.where('display_name', isEqualTo: usertag==""?"Nischal Nayak":usertag) please help i want to open the profile by pssing useref from linkytext . how to pass usertag string to streambuilder and everytime i tap it serch the doc and pass the userref . when i tap on the text (linkyfy text )now the linkvalue is still empty and "Nischal Nayak " is passed in the streambuilder