toFields method
The function removes all outside {} from gql and returns clear string
Implementation
String toFields({required final String gqlFragment}) {
final arrOrigin = gqlFragment.split('{');
arrOrigin.removeAt(0);
final cuttedStart = arrOrigin.join('{');
final cuttedStartArr = cuttedStart.split('}');
cuttedStartArr.removeAt(cuttedStartArr.length - 1);
final finalStr = cuttedStartArr.join('}');
return finalStr;
}