Flutter Remove Duplicated ListView - flutter

Question

In my application, i'm getting an API response as follows
{
"success": true,
"data": {
"items": [
{
"sequenceno": 1933,
"_id": "5eff1",
"chapter": "Numbers and Numeration",
"title": "Place Value: 3-digits",
"package_description": "This learning module helps to familiarise with the concept of place value of 3-digit numbers.",
"age_level": [
99,
8
],
"pkg_sequence": "2501",
"packagescors": {
"score": [
50
],
"date": [
"1600259121340"
]
}
},
{
"sequenceno": 1933,
"_id": "5d79",
"chapter": "Numbers and Numeration",
"title": "Place Value: 4-digits",
"package_description": "This learning module helps the kids familiarise with the concept of Place value of a number.",
"age_level": [
99,
8
],
"pkg_sequence": "2501",
"packagescors": {
"score": [
60
],
"date": [
"1615283866457"
]
}
},
]
The data is modules from a subject with chapters and titles under chapters. Each data has a key named 'chapter'. Whenever the listview is built the data gets duplicated
How can I remove duplicates and properly build the list?

Answer 1

Try out this.
final ids = myList.map((e) => e.id).toSet();
myList.retainWhere((x) => ids.remove(x.id)); // set your response param instead of id.