feat(server) Extend PUT /album/:id/assets endpoint (#857)

* Add new query parameter to API endpoint that allows adding assets to albums which potentially contain assets that are already part of this album.

* Change API endpoint

* Generate new APIs

* Fixed test

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/openapi/lib/model/add_assets_response_dto.dart

@@ -0,0 +1,138 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+part of openapi.api;
+
+class AddAssetsResponseDto {
+  /// Returns a new [AddAssetsResponseDto] instance.
+  AddAssetsResponseDto({
+    required this.successfullyAdded,
+    this.alreadyInAlbum = const [],
+    this.album,
+  });
+
+  int successfullyAdded;
+
+  List<String> alreadyInAlbum;
+
+  ///
+  /// Please note: This property should have been non-nullable! Since the specification file
+  /// does not include a default value (using the "default:" property), however, the generated
+  /// source code must fall back to having a nullable type.
+  /// Consider adding a "default:" property in the specification file to hide this note.
+  ///
+  AlbumResponseDto? album;
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || other is AddAssetsResponseDto &&
+     other.successfullyAdded == successfullyAdded &&
+     other.alreadyInAlbum == alreadyInAlbum &&
+     other.album == album;
+
+  @override
+  int get hashCode =>
+    // ignore: unnecessary_parenthesis
+    (successfullyAdded.hashCode) +
+    (alreadyInAlbum.hashCode) +
+    (album == null ? 0 : album!.hashCode);
+
+  @override
+  String toString() => 'AddAssetsResponseDto[successfullyAdded=$successfullyAdded, alreadyInAlbum=$alreadyInAlbum, album=$album]';
+
+  Map<String, dynamic> toJson() {
+    final _json = <String, dynamic>{};
+      _json[r'successfullyAdded'] = successfullyAdded;
+      _json[r'alreadyInAlbum'] = alreadyInAlbum;
+    if (album != null) {
+      _json[r'album'] = album;
+    } else {
+      _json[r'album'] = null;
+    }
+    return _json;
+  }
+
+  /// Returns a new [AddAssetsResponseDto] instance and imports its values from
+  /// [value] if it's a [Map], null otherwise.
+  // ignore: prefer_constructors_over_static_methods
+  static AddAssetsResponseDto? fromJson(dynamic value) {
+    if (value is Map) {
+      final json = value.cast<String, dynamic>();
+
+      // Ensure that the map contains the required keys.
+      // Note 1: the values aren't checked for validity beyond being non-null.
+      // Note 2: this code is stripped in release mode!
+      assert(() {
+        requiredKeys.forEach((key) {
+          assert(json.containsKey(key), 'Required key "AddAssetsResponseDto[$key]" is missing from JSON.');
+          assert(json[key] != null, 'Required key "AddAssetsResponseDto[$key]" has a null value in JSON.');
+        });
+        return true;
+      }());
+
+      return AddAssetsResponseDto(
+        successfullyAdded: mapValueOfType<int>(json, r'successfullyAdded')!,
+        alreadyInAlbum: json[r'alreadyInAlbum'] is List
+            ? (json[r'alreadyInAlbum'] as List).cast<String>()
+            : const [],
+        album: AlbumResponseDto.fromJson(json[r'album']),
+      );
+    }
+    return null;
+  }
+
+  static List<AddAssetsResponseDto>? listFromJson(dynamic json, {bool growable = false,}) {
+    final result = <AddAssetsResponseDto>[];
+    if (json is List && json.isNotEmpty) {
+      for (final row in json) {
+        final value = AddAssetsResponseDto.fromJson(row);
+        if (value != null) {
+          result.add(value);
+        }
+      }
+    }
+    return result.toList(growable: growable);
+  }
+
+  static Map<String, AddAssetsResponseDto> mapFromJson(dynamic json) {
+    final map = <String, AddAssetsResponseDto>{};
+    if (json is Map && json.isNotEmpty) {
+      json = json.cast<String, dynamic>(); // ignore: parameter_assignments
+      for (final entry in json.entries) {
+        final value = AddAssetsResponseDto.fromJson(entry.value);
+        if (value != null) {
+          map[entry.key] = value;
+        }
+      }
+    }
+    return map;
+  }
+
+  // maps a json object with a list of AddAssetsResponseDto-objects as value to a dart map
+  static Map<String, List<AddAssetsResponseDto>> mapListFromJson(dynamic json, {bool growable = false,}) {
+    final map = <String, List<AddAssetsResponseDto>>{};
+    if (json is Map && json.isNotEmpty) {
+      json = json.cast<String, dynamic>(); // ignore: parameter_assignments
+      for (final entry in json.entries) {
+        final value = AddAssetsResponseDto.listFromJson(entry.value, growable: growable,);
+        if (value != null) {
+          map[entry.key] = value;
+        }
+      }
+    }
+    return map;
+  }
+
+  /// The list of required keys that must be present in a JSON.
+  static const requiredKeys = <String>{
+    'successfullyAdded',
+    'alreadyInAlbum',
+  };
+}
+