Dart Example Parse/Decode JSON Nested Classes

file.dart

import 'package:dart_date/dart_date.dart';
import 'dart:convert';
class LastActivities {
  Date all;
  MoviesActivities movies;
  EpisodesActivities episodes;
  ShowsActivities shows;
  SeasonsActivities seasons;
  CommentsActivities comments;
  ListsActivities lists;
  LastActivities(this.all, this.movies, this.episodes, this.shows, this.seasons, this.comments, this.lists);
  String toJson() {
    var jsm = Map<String, Object>();
    jsm['all'] = all.toIso8601String();
    jsm['movies'] = movies.toMap();
    jsm['episodes'] = episodes.toMap();
    jsm['shows'] = shows.toMap();
    jsm['seasons'] = seasons.toMap();
    jsm['comments'] = comments.toMap();
    jsm['lists'] = lists.toMap();
    var jss = json.encode(jsm);
    return jss;
  }

  Map toMap() {
    return json.decode(this.toJson());
  }

  static LastActivities fromJson(String jsonStr) {
    Map jsm = json.decode(jsonStr);
    return LastActivities.fromMap(jsm);
  }

  static LastActivities fromMap(Map jsm) {
    Date all = Date.parse(jsm["all"]);
    MoviesActivities movies = MoviesActivities.fromMap(jsm["movies"]);
    EpisodesActivities episodes = EpisodesActivities.fromMap(jsm["episodes"]);
    ShowsActivities shows = ShowsActivities.fromMap(jsm["shows"]);
    SeasonsActivities seasons = SeasonsActivities.fromMap(jsm["seasons"]);
    CommentsActivities comments = CommentsActivities.fromMap(jsm["comments"]);
    ListsActivities lists = ListsActivities.fromMap(jsm["lists"]);
    return LastActivities(
      all,
      movies,
      episodes,
      shows,
      seasons,
      comments,
      lists
    );
  }
}

class MoviesActivities {
  Date watched_at;
  Date collected_at;
  Date rated_at;
  Date watchlisted_at;
  Date commented_at;
  Date paused_at;
  Date hidden_at;
  MoviesActivities(
  this.watched_at,
  this.collected_at,
  this.rated_at,
  this.watchlisted_at,
  this.commented_at,
  this.paused_at,
  this.hidden_at);

  String toJson() {
    var jsm = Map<String, Object>();
    jsm['watched_at'] = watched_at.toIso8601String();
    jsm['collected_at'] = collected_at.toIso8601String();
    jsm['rated_at'] = rated_at.toIso8601String();
    jsm['watchlisted_at'] = watchlisted_at.toIso8601String();
    jsm['commented_at'] = commented_at.toIso8601String();
    jsm['paused_at'] = paused_at.toIso8601String();
    jsm['hidden_at'] = hidden_at.toIso8601String();
    var jss = json.encode(jsm);
    return jss;
  }

  Map toMap() {
    return json.decode(this.toJson());
  }

  static MoviesActivities fromJson(String jsonStr) {
    Map jsm = json.decode(jsonStr);
    return MoviesActivities.fromMap(jsm);
  }

  static MoviesActivities fromMap(Map jsm) {
    return MoviesActivities(
      Date.parse(jsm["watched_at"]),
      Date.parse(jsm["collected_at"]),
      Date.parse(jsm["rated_at"]),
      Date.parse(jsm["watchlisted_at"]),
      Date.parse(jsm["commented_at"]),
      Date.parse(jsm["paused_at"]),
      Date.parse(jsm["hidden_at"]),
    );
  }
}

class EpisodesActivities {
  Date watched_at;
  Date collected_at;
  Date rated_at;
  Date watchlisted_at;
  Date commented_at;
  Date paused_at;
  EpisodesActivities(
    this.watched_at,
    this.collected_at,
    this.rated_at,
    this.watchlisted_at,
    this.commented_at,
    this.paused_at
  );
  String toJson() {
    var jsm = Map<String, Object>();
    jsm['watched_at'] = watched_at.toIso8601String();
    jsm['collected_at'] = collected_at.toIso8601String();
    jsm['rated_at'] = rated_at.toIso8601String();
    jsm['watchlisted_at'] = watchlisted_at.toIso8601String();
    jsm['commented_at'] = commented_at.toIso8601String();
    jsm['paused_at'] = paused_at.toIso8601String();
    var jss = json.encode(jsm);
    return jss;
  }

  Map toMap() {
    return json.decode(this.toJson());
  }

  static EpisodesActivities fromJson(String jsonStr) {
    Map jsm = json.decode(jsonStr);
    return EpisodesActivities.fromMap(jsm);
  }

  static EpisodesActivities fromMap(Map jsm) {
    return EpisodesActivities(
      Date.parse(jsm["watched_at"]),
      Date.parse(jsm["collected_at"]),
      Date.parse(jsm["rated_at"]),
      Date.parse(jsm["watchlisted_at"]),
      Date.parse(jsm["commented_at"]),
      Date.parse(jsm["paused_at"]),
    );
  }
}

class ShowsActivities {
  Date rated_at;
  Date watchlisted_at;
  Date commented_at;
  Date hidden_at;
  ShowsActivities(
      this.rated_at,
      this.watchlisted_at,
      this.commented_at,
      this.hidden_at);

  String toJson() {
    var jsm = Map<String, Object>();
    jsm['rated_at'] = rated_at.toIso8601String();
    jsm['watchlisted_at'] = watchlisted_at.toIso8601String();
    jsm['commented_at'] = commented_at.toIso8601String();
    jsm['hidden_at'] = hidden_at.toIso8601String();
    var jss = json.encode(jsm);
    return jss;
  }

  Map toMap() {
    return json.decode(this.toJson());
  }

  static ShowsActivities fromJson(String jsonStr) {
    Map jsm = json.decode(jsonStr);
    return ShowsActivities.fromMap(jsm);
  }

  static ShowsActivities fromMap(Map jsm) {
    return ShowsActivities(
      Date.parse(jsm["rated_at"]),
      Date.parse(jsm["watchlisted_at"]),
      Date.parse(jsm["commented_at"]),
      Date.parse(jsm["hidden_at"]),
    );
  }
}

class SeasonsActivities {
  Date rated_at;
  Date watchlisted_at;
  Date commented_at;
  Date hidden_at;
  SeasonsActivities(
      this.rated_at,
      this.watchlisted_at,
      this.commented_at,
      this.hidden_at);

  String toJson() {
    var jsm = Map<String, Object>();
    jsm['rated_at'] = rated_at.toIso8601String();
    jsm['watchlisted_at'] = watchlisted_at.toIso8601String();
    jsm['commented_at'] = commented_at.toIso8601String();
    jsm['hidden_at'] = hidden_at.toIso8601String();
    var jss = json.encode(jsm);
    return jss;
  }

  Map toMap() {
    return json.decode(this.toJson());
  }

  static SeasonsActivities fromJson(String jsonStr) {
    Map jsm = json.decode(jsonStr);
    return SeasonsActivities.fromMap(jsm);
  }

  static SeasonsActivities fromMap(Map jsm) {
    return SeasonsActivities(
      Date.parse(jsm["rated_at"]),
      Date.parse(jsm["watchlisted_at"]),
      Date.parse(jsm["commented_at"]),
      Date.parse(jsm["hidden_at"]),
    );
  }
}

class CommentsActivities {
  Date liked_at;
  CommentsActivities(
      this.liked_at
  );

  String toJson() {
    var jsm = Map<String, Object>();
    jsm['liked_at'] = liked_at.toIso8601String();
    var jss = json.encode(jsm);
    return jss;
  }

  Map toMap() {
    return json.decode(this.toJson());
  }

  static CommentsActivities fromJson(String jsonStr) {
    Map jsm = json.decode(jsonStr);
    return CommentsActivities.fromMap(jsm);
  }

  static CommentsActivities fromMap(Map jsm) {
    return CommentsActivities(
      Date.parse(jsm["liked_at"])
    );
  }
}

class ListsActivities {
  Date liked_at;
  Date updated_at;
  Date commented_at;
  ListsActivities(
      this.liked_at,
      this.updated_at,
      this.commented_at
  );

  String toJson() {
    var jsm = Map<String, Object>();
    jsm['liked_at'] = liked_at.toIso8601String();
    jsm['updated_at'] = updated_at.toIso8601String();
    jsm['commented_at'] = commented_at.toIso8601String();
    var jss = json.encode(jsm);
    return jss;
  }

  Map toMap() {
    return json.decode(this.toJson());
  }

  static ListsActivities fromJson(String jsonStr) {
    Map jsm = json.decode(jsonStr);
    return ListsActivities.fromMap(jsm);
  }

  static ListsActivities fromMap(Map jsm) {
    return ListsActivities(
        Date.parse(jsm["liked_at"]),
        Date.parse(jsm["updated_at"]),
        Date.parse(jsm["commented_at"])
    );
  }
}

file.json

{
  "all": "2014-11-20T07:01:32.000Z",
  "movies": {
    "watched_at": "2014-11-19T21:42:41.000Z",
    "collected_at": "2014-11-20T06:51:30.000Z",
    "rated_at": "2014-11-19T18:32:29.000Z",
    "watchlisted_at": "2014-11-19T21:42:41.000Z",
    "commented_at": "2014-11-20T06:51:30.000Z",
    "paused_at": "2014-11-20T06:51:30.000Z",
    "hidden_at": "2016-08-20T06:51:30.000Z"
  },
  "episodes": {
    "watched_at": "2014-11-20T06:51:30.000Z",
    "collected_at": "2014-11-19T22:02:41.000Z",
    "rated_at": "2014-11-20T06:51:30.000Z",
    "watchlisted_at": "2014-11-20T06:51:30.000Z",
    "commented_at": "2014-11-20T06:51:30.000Z",
    "paused_at": "2014-11-20T06:51:30.000Z"
  },
  "shows": {
    "rated_at": "2014-11-19T19:50:58.000Z",
    "watchlisted_at": "2014-11-20T06:51:30.000Z",
    "commented_at": "2014-11-20T06:51:30.000Z",
    "hidden_at": "2016-08-20T06:51:30.000Z"
  },
  "seasons": {
    "rated_at": "2014-11-19T19:54:24.000Z",
    "watchlisted_at": "2014-11-20T06:51:30.000Z",
    "commented_at": "2014-11-20T06:51:30.000Z",
    "hidden_at": "2016-08-20T06:51:30.000Z"
  },
  "comments": {
    "liked_at": "2014-11-20T03:38:09.000Z"
  },
  "lists": {
    "liked_at": "2014-11-20T00:36:48.000Z",
    "updated_at": "2014-11-20T06:52:18.000Z",
    "commented_at": "2014-11-20T06:51:30.000Z"
  }
}

file_test.dart

import 'package:test/test.dart';
import './last_activities.dart';
import 'package:dart_date/dart_date.dart';

var dateStr = "2014-11-20T07:01:32.000Z";
var moviesJson = """
  {
    "watched_at": "$dateStr",
    "collected_at": "$dateStr",
    "rated_at": "$dateStr",
    "watchlisted_at": "$dateStr",
    "commented_at": "$dateStr",
    "paused_at": "$dateStr",
    "hidden_at": "$dateStr"
  }
""";
var episodesJson = """
  {
    "watched_at": "$dateStr",
    "collected_at": "$dateStr",
    "rated_at": "$dateStr",
    "watchlisted_at": "$dateStr",
    "commented_at": "$dateStr",
    "paused_at": "$dateStr"
  }
""";

var showsJson = """
  {
    "rated_at": "$dateStr",
    "watchlisted_at": "$dateStr",
    "commented_at": "$dateStr",
    "hidden_at": "$dateStr"
  }
""";
var seasonsJson = """
  {
    "rated_at": "$dateStr",
    "watchlisted_at": "$dateStr",
    "commented_at": "$dateStr",
    "hidden_at": "$dateStr"
  }
""";
var commentsJson = """
  {
    "liked_at": "$dateStr"
  }
""";
var listsJson = """
  {
    "liked_at": "$dateStr",
    "updated_at": "$dateStr",
    "commented_at": "$dateStr"
  }
""";

var lastActivitiesJson = """
  {
    "all": "$dateStr",
    "movies": $moviesJson,
    "episodes": $episodesJson,
    "shows": $showsJson,
    "seasons": $seasonsJson,
    "comments": $commentsJson,
    "lists": $listsJson
  }
""";

String flatJSON(String json) {
  return json.replaceAll(RegExp(r"(\n|\r\n|\ )"), '');
}

void main(){
  group('LastActivies', () {
    test('.toJSON() converts to a json string', () {
      var date = Date.parse(dateStr);
      var la = LastActivities(
        date,
        MoviesActivities(date, date, date, date, date, date, date),
        EpisodesActivities(date, date, date, date, date, date),
        ShowsActivities(date, date, date, date),
        SeasonsActivities(date, date, date, date),
        CommentsActivities(date),
        ListsActivities(date, date, date)
      );
      expect(la.toJson(), equals(flatJSON(lastActivitiesJson)));
    });
    test('.fromJSON() converts a json string to a object', () {
      var date = Date.parse(dateStr);
      var la = LastActivities.fromJson(lastActivitiesJson);
      expect(la.all, equals(date));
      expect(la.movies.toJson(), equals(MoviesActivities(date, date, date, date, date, date, date).toJson()));
      expect(la.episodes.toJson(), equals(EpisodesActivities(date, date, date, date, date, date).toJson()));
      expect(la.shows.toJson(), equals(SeasonsActivities(date, date, date, date).toJson()));
      expect(la.seasons.toJson(), equals(SeasonsActivities(date, date, date, date).toJson()));
      expect(la.comments.toJson(), equals(CommentsActivities(date).toJson()));
      expect(la.lists.toJson(), equals(ListsActivities(date, date, date).toJson()));
    });
  });
  group('MoviesActivities', () {
    test('.toJSON() converts to a json string', () {
      var flatJsonStr = flatJSON(moviesJson);
      var date = Date.parse(dateStr);
      var ma = MoviesActivities(date, date, date, date, date, date, date);
      expect(ma.toJson(), equals(flatJsonStr));
    });
    test('.fromJSON() converts a json string to a object', () {
      var date = Date.parse(dateStr);
      var la = MoviesActivities.fromJson(moviesJson);
      var li = MoviesActivities(date, date, date, date, date, date, date);
      expect(la.watched_at, equals(li.watched_at));
      expect(la.collected_at, equals(li.collected_at));
      expect(la.rated_at, equals(li.rated_at));
      expect(la.watchlisted_at, equals(li.watchlisted_at));
      expect(la.commented_at, equals(li.commented_at));
      expect(la.paused_at, equals(li.paused_at));
      expect(la.hidden_at, equals(li.hidden_at));
    });
  });
  group('EpisodesActivities', () {
    test('.toJSON() converts to a json string', () {
      var flatJsonStr = flatJSON(episodesJson);
      var date = Date.parse(dateStr);
      var ma = EpisodesActivities(date, date, date, date, date, date);
      expect(ma.toJson(), equals(flatJsonStr));
    });
    test('.fromJSON() converts a json string to a object', () {
      var date = Date.parse(dateStr);
      var la = EpisodesActivities.fromJson(episodesJson);
      var li = EpisodesActivities(date, date, date, date, date, date);
      expect(la.watched_at, equals(li.watched_at));
      expect(la.collected_at, equals(li.collected_at));
      expect(la.rated_at, equals(li.rated_at));
      expect(la.watchlisted_at, equals(li.watchlisted_at));
      expect(la.commented_at, equals(li.commented_at));
      expect(la.paused_at, equals(li.paused_at));
    });
  });
  group('ShowsActivities', () {
    test('.toJSON() converts to a json string', () {
      var flatJsonStr = flatJSON(showsJson);
      var date = Date.parse(dateStr);
      var ma = ShowsActivities(date, date, date, date);
      expect(ma.toJson(), equals(flatJsonStr));
    });
    test('.fromJSON() converts a json string to a object', () {
      var date = Date.parse(dateStr);
      var la = ShowsActivities.fromJson(showsJson);
      var li = ShowsActivities(date, date, date, date);
      expect(la.rated_at, equals(li.rated_at));
      expect(la.watchlisted_at, equals(li.watchlisted_at));
      expect(la.commented_at, equals(li.commented_at));
      expect(la.hidden_at, equals(li.hidden_at));
    });
  });
  group('SeasonsActivities', () {
    test('.toJSON() converts to a json string', () {
      var flatJsonStr = flatJSON(seasonsJson);
      var date = Date.parse(dateStr);
      var ma = SeasonsActivities(date, date, date, date);
      expect(ma.toJson(), equals(flatJsonStr));
    });
    test('.fromJSON() converts a json string to a object', () {
      var date = Date.parse(dateStr);
      var la = SeasonsActivities.fromJson(seasonsJson);
      var li = SeasonsActivities(date, date, date, date);
      expect(la.rated_at, equals(li.rated_at));
      expect(la.watchlisted_at, equals(li.watchlisted_at));
      expect(la.commented_at, equals(li.commented_at));
      expect(la.hidden_at, equals(li.hidden_at));
    });
  });
  group('CommentsActivities', () {
    test('.toJSON() converts to a json string', () {
      var flatJsonStr = flatJSON(commentsJson);
      var date = Date.parse(dateStr);
      var ma = CommentsActivities(date);
      expect(ma.toJson(), equals(flatJsonStr));
    });
    test('.fromJSON() converts a json string to a object', () {
      var date = Date.parse(dateStr);
      var la = CommentsActivities.fromJson(commentsJson);
      var li = CommentsActivities(date);
      expect(la.liked_at, equals(li.liked_at));
    });
  });
  group('ListsActivities', () {
    test('.toJSON() converts to a json string', () {
      var flatJsonStr = flatJSON(listsJson);
      var date = Date.parse(dateStr);
      var ma = ListsActivities(date, date, date);
      expect(ma.toJson(), equals(flatJsonStr));
    });
    test('.fromJSON() converts a json string to a object', () {
      var date = Date.parse(dateStr);
      var la = ListsActivities.fromJson(listsJson);
      var li = ListsActivities(
          date, date, date
      );
      expect(la.liked_at, equals(li.liked_at));
      expect(la.updated_at, equals(li.updated_at));
      expect(la.commented_at, equals(li.commented_at));
    });
  });
}