how to make drop down in flutter using split for removing comma on column value of sqflite database

问题

i want dropdown of stages in flutter which values come from sqflite database. the sample value in json is in below format and these values are store locally. there are two dropdown

if i select 'teacher' pipeline then it's id 54 was passed to future builder of stages's dropdown and i want to select one stage.

         {
            "id": 54,
            "name": "teacher",
            "stages": "{\"advertise\":false,\"interview\":false}",
            "created_at": "2019-08-23 20:11:54",
            "updated_at": "2019-08-23 20:12:48",
            "deleted_at": null
        },

the below is future builder for dropdown

                             FutureBuilder(
                              future: pipelineHelper.getPipeStage(pipelineId),
                              builder: (BuildContext context,
                                  AsyncSnapshot<List<Pipeline>>
                                  snapshot) {
                                if (!snapshot.hasData)
                                  return CircularProgressIndicator();
                                return DropdownButton(
                                  items: snapshot.data
                                      .map((stageList) => DropdownMenuItem<Pipeline>(
                                    value: stageList, child: Text(stageList.stages),))
                                      .toList(),
                                  onChanged: (value) {
                                    setState(() {
                                      stageName = value.stages;
                                      debugPrint('stage selected');
                                    });
                                  },
                                  isExpanded: true,
                                  hint: Column(
                                    mainAxisAlignment: MainAxisAlignment.start,
                                    crossAxisAlignment: CrossAxisAlignment.start,
                                    children: <Widget>[
                                      SizedBox(height: 8.0),
                                      Text('Stage',style: _fontSize,),
                                      stageName == null ? Text('') : Text(stageName,style: _blackColor)
                                    ],),
                                );
                              }),

when i try

 items: snapshot.data.stages.split(',')

i got Error: The getter 'stages' isn't defined for the class 'List' error. The below is my helper function

Future<List<Pipeline>> getPipeStage(int number) async {
Database db = await this.database;
var orgMapList = await db.rawQuery('SELECT $colStages from $pipeTable WHERE $colId = $number'); // Get 'Map List' from database
int count = orgMapList.length;
 List<Pipeline> pipeList = List<Pipeline>();
// For loop to create a 'Pipeline List' from a 'Map List'
for (int i = 0; i < count; i++) {
  pipeList.add(Pipeline.fromMapObject(orgMapList[i]));
}
return pipeList;

}

来源：https://stackoverflow.com/questions/58056814/how-to-make-drop-down-in-flutter-using-split-for-removing-comma-on-column-value

标签

json

Flutter

split

dropdown

sqflite