group list object with out using groupBy plugin , how to implement-CodePudding

this is the input

{ "product": [ { "name": "cake", "message": "Message1", "time":"2020-06-16" }, { "name": "apple", "message": "Message2", "time": "2020-06-16" }, { "name": "fish", "message": "Message4", "time": "2020-06-15" }, { "name": "toy", "message": "Message5", "time": "2020-06-15" }
] }

want this output below

[ { "time": "2020-06-16", "product": [ { "name": "cake", "message": "Message1" }, { "name": "apple", "message": "Message2" } ] }, { "time": "2020-06-15", "product": [ { "name": "fish", "message": "Message4' }, { "name": "toy", "message": "Message5" } ]
} ]

bez using plugin it tack some time

CodePudding user response：

    final struct = <String, dynamic>{
      { "product": [ { "name": "cake", "message": "Message1", "time":"2020-06-16" }, { "name": "apple", "message": "Message2", "time": "2020-06-16" }, { "name": "fish", "message": "Message4", "time": "2020-06-15" }, { "name": "toy", "message": "Message5", "time": "2020-06-15" }
] }
    };

and add what you need

struct["time"] = "2020-06-16";

CodePudding user response：

Follow the below.

List dataList=[];

var data={ "product": [ { "name": "cake", "message": "Message1", "time":"2020-06-16" }, { "name": "apple", "message": "Message2", "time": "2020-06-16" }, { "name": "fish", "message": "Message4", "time": "2020-06-15" }, { "name": "toy", "message": "Message5", "time": "2020-06-15" }
] };

In init call,

dataList.add(data);

Print result:

[ { "time": "2020-06-16", "product": [ { "name": "cake", "message": "Message1" }, { "name": "apple", "message": "Message2" } ] }, { "time": "2020-06-15", "product": [ { "name": "fish", "message": "Message4' }, { "name": "toy", "message": "Message5" } ]
} ]