A Flutter plugin that allows communication with a Parse Server

by Flutter Awesome

Parse For Flutter!

Hi, this is a Flutter plugin that allows communication with a Parse Server, (https://parseplatform.org) either hosted on your own server or another, like (http://Back4App.com).

This is a work in progress and we are consistently updating it. Please let us know if you think anything needs changing/adding, and more than ever, please do join in on this project. (Even if it is just to improve our documentation)

Getting Started

To install, either add dependency in your pubspec.yaml file.

Once you have the library added to your project, upon first call to your app (Similar to what your application class would be) add the following…

await Parse().initialize(
        keyApplicationId,
        keyParseServerUrl);

If you want to use secure storage or use the Flutter web/desktop SDK, please change to the below instance of CoreStorage as it has no dependencies on Flutter.

The CoreStoreSembastImp does not encrypt the data on web! (Web is not safe anyway. Encrypt fields manually as needed.)

await Parse().initialize(
  	keyParseApplicationId, 
  	keyParseServerUrl,
    coreStore: await CoreStoreSembastImp.getInstance());

It’s possible to add other parameters to work with your instance of Parse Server:-

  await Parse().initialize(
        keyApplicationId,
        keyParseServerUrl,
        clientKey: keyParseClientKey, // Required for some setups
        debug: true, // When enabled, prints logs to console
        liveQueryUrl: keyLiveQueryUrl, // Required if using LiveQuery 
        autoSendSessionId: true, // Required for authentication and ACL
        securityContext: securityContext, // Again, required for some setups
	coreStore: await CoreStoreSharedPrefsImp.getInstance()); // Local data storage method. Will use SharedPreferences instead of Sembast as an internal DB

⚠️ Please note that the master key should only be used in safe environments and never on client side ‼️

Web support

Due to Cross-origin resource sharing (CORS) restrictions, this requires adding X-Parse-Installation-Id as an allowed header to parse-server. When running directly via docker, set the env var PARSE_SERVER_ALLOW_HEADERS=X-Parse-Installation-Id. When running via express, set ParseServerOptions allowHeaders: ['X-Parse-Installation-Id'].

Network client

By default, this SDK uses the ParseHTTPClient. Another option is use ParseDioClient. This client supports the most features (for example a progress callback at the file upload), but a benchmark has shown, that dio is slower than http on web.

If you want to use the ParseDioClient, which uses the dio network library, you can provide a custom ParseClientCreator at the initialization of the SDK.

await Parse().initialize(
  //...
  clientCreator: ({bool? sendSessionId, SecurityContext? securityContext}) => ParseDioClient(sendSessionId: sendSessionId, securityContext: securityContext),
);

Objects

You can create custom objects by calling:

var dietPlan = ParseObject('DietPlan')
	..set('Name', 'Ketogenic')
	..set('Fat', 65);
await dietPlan.save();

Or update existing object by its objectId by calling:

var dietPlan = ParseObject('DietPlan')
	..objectId = 'R5EonpUDWy'
	..set('Fat', 70);
await dietPlan.save();

Verify that the object has been successfully saved using

var response = await dietPlan.save();
if (response.success) {
   dietPlan = response.results.first;
}

Types supported:

  • String
  • Double
  • Int
  • Boolean
  • DateTime
  • File
  • Geopoint
  • ParseObject/ParseUser (Pointer)
  • Map
  • List (all types supported)

You then have the ability to do the following with that object: The features available are:-

  • Get
  • GetAll
  • Create
  • Save
  • Query – By object Id
  • Delete
  • Complex queries as shown above
  • Pin
  • Plenty more
  • Counters
  • Array Operators

Custom Objects

You can create your own ParseObjects or convert your existing objects into Parse Objects by doing the following:

class DietPlan extends ParseObject implements ParseCloneable {

  DietPlan() : super(_keyTableName);
  DietPlan.clone(): this();

  /// Looks strangely hacky but due to Flutter not using reflection, we have to
  /// mimic a clone
  @override clone(Map map) => DietPlan.clone()..fromJson(map);

  static const String _keyTableName = 'Diet_Plans';
  static const String keyName = 'Name';
  
  String get name => get<String>(keyName);
  set name(String name) => set<String>(keyName, name);
}

When receiving an ParseObject from the SDK, you can often provide an instance of your custom object as an copy object. To always use your custom object class, you can register your subclass at the initialization of the SDK.

Parse().initialize(
   ...,
   registeredSubClassMap: <String, ParseObjectConstructor>{
     'Diet_Plans': () => DietPlan(),
   },
   parseUserConstructor: (username, password, emailAddress, {client, debug, sessionToken}) => CustomParseUser(username, password, emailAddress),
);

Additionally you can register SubClasses after the initialization of the SDK.

ParseCoreData().registerSubClass('Diet_Plans', () => DietPlan());
ParseCoreData().registerUserSubClass((username, password, emailAddress, {client, debug, sessionToken}) => CustomParseUser(username, password, emailAddress));

Providing a ParseObject as described above should still work, even if you have registered a different SubClass.

For custom file classes have a lock at here.

Add new values to objects

To add a variable to an object call and retrieve it, call

dietPlan.set<int>('RandomInt', 8);
var randomInt = dietPlan.get<int>('RandomInt');

Save objects using pins

You can now save an object by calling .pin() on an instance of an object

dietPlan.pin();

and to retrieve it

var dietPlan = DietPlan().fromPin('OBJECT ID OF OBJECT');

Storage

We now have 2 types of storage, secure and unsecure. We currently rely on 2 third party options:

  • SharedPreferences
  • Sembast Sembast offers secured storage, whilst SharePreferences wraps NSUserDefaults (on iOS) and SharedPreferences (on Android).

The storage method is defined in the parameter coreStore in Parse().initialize

Check sample code for options

Increment Counter values in objects

Retrieve it, call

var response = await dietPlan.increment("count", 1);

or using with save function

dietPlan.setIncrement('count', 1);
dietPlan.setDecrement('count', 1);
var response = dietPlan.save()

Array Operator in objects

Retrieve it, call

var response = await dietPlan.add("listKeywords", ["a", "a","d"]);

var response = await dietPlan.addUnique("listKeywords", ["a", "a","d"]);

var response = await dietPlan.remove("listKeywords", ["a"]);

or using with save function

dietPlan.setAdd('listKeywords', ['a','a','d']);
dietPlan.setAddUnique('listKeywords', ['a','a','d']);
dietPlan.setRemove('listKeywords', ['a']);
var response = dietPlan.save()

Queries

Once you have setup the project and initialised the instance, you can then retreive data from your server by calling:

var apiResponse = await ParseObject('ParseTableName').getAll();

if (apiResponse.success){
  for (var testObject in apiResponse.result) {
    print(ApplicationConstants.APP_NAME + ": " + testObject.toString());
  }
}

Or you can get an object by its objectId:

var dietPlan = await DietPlan().getObject('R5EonpUDWy');

if (dietPlan.success) {
  print(ApplicationConstants.keyAppName + ": " + (dietPlan.result as DietPlan).toString());
} else {
  print(ApplicationConstants.keyAppName + ": " + dietPlan.exception.message);
}

To query for user objects, you could use the function ParseUser.forQuery() like this:

var queryBuilder  = QueryBuilder<ParseUser>(ParseUser.forQuery())
  ..whereEqualTo('activated', true);

var response = await queryBuilder.query();

if (response.success) {
  print(response.results);
} else {
  print(response.exception.message);
}

Alternative query methods

The standard query method query() returns a ParseResponse that contains the result or the error. As an alternative, you can also use Future<List<T>> find() for receiving options. This method returns an Future that either resolves in an error (equivalent of the error in the ParseResponse) or an List containing the queried objects. One difference, you should be aware of, is the fact, that Future<List<T>> find() will return an empty list instead of the ‘No results’ error you receive in case no object matches you query.

Choosing between query() and find() comes down to personal preference. Both methods can be used for querying a ParseQuery, just the output method differs.

Similar to find() the QueryBuilder also has a function called Future<T>? first(). Just like find() first() is just a convenience method that makes querying the first object satisfying the query simpler. first() returns an Future, that resoles in an error or the first object matching the query. In case no object satisfies the query, the result will be null.

Complex queries

You can create complex queries to really put your database to the test:

var queryBuilder = QueryBuilder<DietPlan>(DietPlan())
  ..startsWith(DietPlan.keyName, "Keto")
  ..greaterThan(DietPlan.keyFat, 64)
  ..lessThan(DietPlan.keyFat, 66)
  ..equals(DietPlan.keyCarbs, 5);

var response = await queryBuilder.query();

if (response.success) {
  print(ApplicationConstants.keyAppName + ": " + ((response.results as List<dynamic>).first as DietPlan).toString());
} else {
  print(ApplicationConstants.keyAppName + ": " + response.exception.message);
}

if you want to find objects that match one of several queries, you can use QueryBuilder.or method to construct a query that is an OR of the queries passed in. For instance if you want to find players who either have a lot of wins or a few wins, you can do:

ParseObject playerObject = ParseObject("Player");

QueryBuilder<ParseObject> lotsOfWins =
    QueryBuilder<ParseObject>(playerObject))
      ..whereGreaterThan('wins', 50);

QueryBuilder<ParseObject> fewWins =
    QueryBuilder<ParseObject>(playerObject)
      ..whereLessThan('wins', 5);

QueryBuilder<ParseObject> mainQuery = QueryBuilder.or(
      playerObject,
      [lotsOfWins, fewWins],
    );

var apiResponse = await mainQuery.query();

The features available are:-

  • Equals
  • Contains
  • LessThan
  • LessThanOrEqualTo
  • GreaterThan
  • GreaterThanOrEqualTo
  • NotEqualTo
  • StartsWith
  • EndsWith
  • Exists
  • Near
  • WithinMiles
  • WithinKilometers
  • WithinRadians
  • WithinGeoBox
  • WithinPolygon
  • MatchesQuery
  • DoesNotMatchQuery
  • MatchesKeyInQuery
  • DoesNotMatchKeyInQuery
  • Regex
  • Order
  • Limit
  • Skip
  • Ascending
  • Descending
  • Plenty more!

Relational queries

If you want to retrieve objects where a field contains an object that matches another query, you can use the whereMatchesQuery condition. For example, imagine you have Post class and a Comment class, where each Comment has a pointer to its parent Post. You can find comments on posts with images by doing:

QueryBuilder<ParseObject> queryPost =
    QueryBuilder<ParseObject>(ParseObject('Post'))
      ..whereValueExists('image', true);

QueryBuilder<ParseObject> queryComment =
    QueryBuilder<ParseObject>(ParseObject('Comment'))
      ..whereMatchesQuery('post', queryPost);

var apiResponse = await queryComment.query();

If you want to retrieve objects where a field contains an object that does not match another query, you can use the whereDoesNotMatchQuery condition. Imagine you have Post class and a Comment class, where each Comment has a pointer to its parent Post. You can find comments on posts without images by doing:

QueryBuilder<ParseObject> queryPost =
    QueryBuilder<ParseObject>(ParseObject('Post'))
      ..whereValueExists('image', true);

QueryBuilder<ParseObject> queryComment =
    QueryBuilder<ParseObject>(ParseObject('Comment'))
      ..whereDoesNotMatchQuery('post', queryPost);

var apiResponse = await queryComment.query();

You can use the whereMatchesKeyInQuery method to get objects where a key matches the value of a key in a set of objects resulting from another query. For example, if you have a class containing sports teams and you store a user’s hometown in the user class, you can issue one query to find the list of users whose hometown teams have winning records. The query would look like::

QueryBuilder<ParseObject> teamQuery =
    QueryBuilder<ParseObject>(ParseObject('Team'))
      ..whereGreaterThan('winPct', 0.5);

QueryBuilder<ParseUser> userQuery =
    QueryBuilder<ParseUser>ParseUser.forQuery())
      ..whereMatchesKeyInQuery('hometown', 'city', teamQuery);

var apiResponse = await userQuery.query();

Conversely, to get objects where a key does not match the value of a key in a set of objects resulting from another query, use whereDoesNotMatchKeyInQuery. For example, to find users whose hometown teams have losing records:

QueryBuilder<ParseObject> teamQuery =
    QueryBuilder<ParseObject>(ParseObject('Team'))
      ..whereGreaterThan('winPct', 0.5);

QueryBuilder<ParseUser> losingUserQuery =
    QueryBuilder<ParseUser>ParseUser.forQuery())
      ..whereDoesNotMatchKeyInQuery('hometown', 'city', teamQuery);

var apiResponse = await losingUserQuery.query();

To filter rows based on objectId’s from pointers in a second table, you can use dot notation:

QueryBuilder<ParseObject> rolesOfTypeX =
    QueryBuilder<ParseObject>(ParseObject('Role'))
      ..whereEqualTo('type', 'x');

QueryBuilder<ParseObject> groupsWithRoleX =
    QueryBuilder<ParseObject>(ParseObject('Group')))
      ..whereMatchesKeyInQuery('objectId', 'belongsTo.objectId', rolesOfTypeX);

var apiResponse = await groupsWithRoleX.query();

Counting Objects

If you only care about the number of games played by a particular player:

QueryBuilder<ParseObject> queryPlayers =
    QueryBuilder<ParseObject>(ParseObject('GameScore'))
      ..whereEqualTo('playerName', 'Jonathan Walsh');
var apiResponse = await queryPlayers.count();
if (apiResponse.success && apiResponse.result != null) {
  int countGames = apiResponse.count;
}

Live Queries

This tool allows you to subscribe to a QueryBuilder you are interested in. Once subscribed, the server will notify clients whenever a ParseObject that matches the QueryBuilder is created or updated, in real-time.

Parse LiveQuery contains two parts, the LiveQuery server and the LiveQuery clients. In order to use live queries, you need to set up both of them.

The Parse Server configuration guide on the server is found here https://docs.parseplatform.org/parse-server/guide/ and is not part of this documentation.

Initialize the Parse Live Query by entering the parameter liveQueryUrl in Parse().initialize:

Parse().initialize(
      keyApplicationId,
      keyParseServerUrl,
      clientKey: keyParseClientKey,
      debug: true,
      liveQueryUrl: keyLiveQueryUrl,
      autoSendSessionId: true);

Declare LiveQuery:

final LiveQuery liveQuery = LiveQuery();

Set the QueryBuilder that will be monitored by LiveQuery:

QueryBuilder<ParseObject> query =
  QueryBuilder<ParseObject>(ParseObject('TestAPI'))
  ..whereEqualTo('intNumber', 1);

Create a subscription You’ll get the LiveQuery events through this subscription. The first time you call subscribe, we’ll try to open the WebSocket connection to the LiveQuery server for you.

Subscription subscription = await liveQuery.client.subscribe(query);

Event Handling We define several types of events you’ll get through a subscription object:

Create event When a new ParseObject is created and it fulfills the QueryBuilder you subscribe, you’ll get this event. The object is the ParseObject which was created.

subscription.on(LiveQueryEvent.create, (value) {
    print('*** CREATE ***: ${DateTime.now().toString()}\n $value ');
    print((value as ParseObject).objectId);
    print((value as ParseObject).updatedAt);
    print((value as ParseObject).createdAt);
    print((value as ParseObject).get('objectId'));
    print((value as ParseObject).get('updatedAt'));
    print((value as ParseObject).get('createdAt'));
});

Update event When an existing ParseObject which fulfills the QueryBuilder you subscribe is updated (The ParseObject fulfills the QueryBuilder before and after changes), you’ll get this event. The object is the ParseObject which was updated. Its content is the latest value of the ParseObject.

subscription.on(LiveQueryEvent.update, (value) {
    print('*** UPDATE ***: ${DateTime.now().toString()}\n $value ');
    print((value as ParseObject).objectId);
    print((value as ParseObject).updatedAt);
    print((value as ParseObject).createdAt);
    print((value as ParseObject).get('objectId'));
    print((value as ParseObject).get('updatedAt'));
    print((value as ParseObject).get('createdAt'));
});

Enter event When an existing ParseObject’s old value does not fulfill the QueryBuilder but its new value fulfills the QueryBuilder, you’ll get this event. The object is the ParseObject which enters the QueryBuilder. Its content is the latest value of the ParseObject.

subscription.on(LiveQueryEvent.enter, (value) {
    print('*** ENTER ***: ${DateTime.now().toString()}\n $value ');
    print((value as ParseObject).objectId);
    print((value as ParseObject).updatedAt);
    print((value as ParseObject).createdAt);
    print((value as ParseObject).get('objectId'));
    print((value as ParseObject).get('updatedAt'));
    print((value as ParseObject).get('createdAt'));
});

Leave event When an existing ParseObject’s old value fulfills the QueryBuilder but its new value doesn’t fulfill the QueryBuilder, you’ll get this event. The object is the ParseObject which leaves the QueryBuilder. Its content is the latest value of the ParseObject.

subscription.on(LiveQueryEvent.leave, (value) {
    print('*** LEAVE ***: ${DateTime.now().toString()}\n $value ');
    print((value as ParseObject).objectId);
    print((value as ParseObject).updatedAt);
    print((value as ParseObject).createdAt);
    print((value as ParseObject).get('objectId'));
    print((value as ParseObject).get('updatedAt'));
    print((value as ParseObject).get('createdAt'));
});

Delete event When an existing ParseObject which fulfills the QueryBuilder is deleted, you’ll get this event. The object is the ParseObject which is deleted

subscription.on(LiveQueryEvent.delete, (value) {
    print('*** DELETE ***: ${DateTime.now().toString()}\n $value ');
    print((value as ParseObject).objectId);
    print((value as ParseObject).updatedAt);
    print((value as ParseObject).createdAt);
    print((value as ParseObject).get('objectId'));
    print((value as ParseObject).get('updatedAt'));
    print((value as ParseObject).get('createdAt'));
});

Unsubscribe If you would like to stop receiving events from a QueryBuilder, you can just unsubscribe the subscription. After that, you won’t get any events from the subscription object and will close the WebSocket connection to the LiveQuery server.

liveQuery.client.unSubscribe(subscription);

Disconnection In case the client’s connection to the server breaks, LiveQuery will automatically try to reconnect. LiveQuery will wait at increasing intervals between reconnection attempts. By default, these intervals are set to [0, 500, 1000, 2000, 5000, 10000] for mobile and [0, 500, 1000, 2000, 5000] for web. You can change these by providing a custom list using the liveListRetryIntervals parameter at Parse.initialize() (“-1” means “do not try to reconnect”).

ParseLiveList

ParseLiveList makes implementing a dynamic List as simple as possible.

General Use

It ships with the ParseLiveList class itself, this class manages all elements of the list, sorts them, keeps itself up to date and Notifies you on changes.

ParseLiveListWidget is a widget that handles all the communication with the ParseLiveList for you. Using ParseLiveListWidget you can create a dynamic List by just providing a QueryBuilder.

ParseLiveListWidget<ParseObject>(
      query: query,
    );

To customize the List Elements, you can provide a childBuilder.

ParseLiveListWidget<ParseObject>(
  query: query,
  reverse: false,
  childBuilder:
      (BuildContext context, ParseLiveListElementSnapshot<ParseObject> snapshot) {
    if (snapshot.failed) {
      return const Text('something went wrong!');
    } else if (snapshot.hasData) {
      return ListTile(
        title: Text(
          snapshot.loadedData.get("text"),
        ),
      );
    } else {
      return const ListTile(
        leading: CircularProgressIndicator(),
      );
    }
  },
);

Similar to the standard ListView, you can provide arguments like reverse or shrinkWrap. By providing the listLoadingElement, you can show the user something while the list is loading.

ParseLiveListWidget<ParseObject>(
  query: query,
  childBuilder: childBuilder,
  listLoadingElement: Center(
    child: CircularProgressIndicator(),
  ),
);

By providing the duration argument, you can change the animation speed.

ParseLiveListWidget<ParseObject>(
  query: query,
  childBuilder: childBuilder,
  duration: Duration(seconds: 1),
);

included Sub-Objects

By default, ParseLiveQuery will provide you with all the objects you included in your Query like this:

queryBuilder.includeObject(/*List of all the included sub-objects*/);

ParseLiveList will not listen for updates on this objects by default. To activate listening for updates on all included objects, add listenOnAllSubItems: true to your ParseLiveListWidgets constructor. If you want ParseLiveList to listen for updates on only some sub-objects, use listeningIncludes: const <String>[/*all the included sub-objects*/] instead. Just as QueryBuilder, ParseLiveList supports nested sub-objects too.

Lazy loading

By default, ParseLiveList lazy loads the content. You can avoid that by setting lazyLoading: false. In case you want to use lazyLoading but you need some columns to be preloaded, you can provide a list of preloadedColumns. Preloading fields of a pointer is supported by using the dot-notation. You can access the preloaded data is stored in the preLoadedData field of the ParseLiveListElementSnapshot.

ParseLiveListWidget<ParseObject>(
  query: query,
  lazyLoading: true,
  preloadedColumns: ["test1", "sender.username"],
  childBuilder:
      (BuildContext context, ParseLiveListElementSnapshot<ParseObject> snapshot) {
    if (snapshot.failed) {
      return const Text('something went wrong!');
    } else if (snapshot.hasData) {
      return ListTile(
        title: Text(
          snapshot.loadedData.get<String>("text"),
        ),
      );
    } else {
      return ListTile(
        title: Text(
          "loading comment from: ${snapshot.preLoadedData?.get<ParseObject>("sender")?.get<String>("username")}",
        ),
      );
    }
  },
);

NOTE: To use this features you have to enable Live Queries first.

Users

You can create and control users just as normal using this SDK.

To register a user, first create one :

var user =  ParseUser().create("TestFlutter", "TestPassword123", "TestFlutterSDK@gmail.com");

Then have the user sign up:

var response = await user.signUp();
if (response.success) user = response.result;

You can also login with the user:

var response = await user.login();
if (response.success) user = response.result;

You can also logout with the user:

var response = await user.logout();
if (response.success) {
    print('User logout');
}

Also, once logged in you can manage sessions tokens. This feature can be called after Parse().init() on startup to check for a logged in user.

user = ParseUser.currentUser();

To add additional columns to the user:

var user = ParseUser("TestFlutter", "TestPassword123", "TestFlutterSDK@gmail.com")
            ..set("userLocation", "FlutterLand");

Other user features are:-

  • Request Password Reset
  • Verification Email Request
  • Get all users
  • Save
  • Destroy user
  • Queries

Facebook, OAuth and 3rd Party Login/User

Usually, each provider will provide their own library for logins, but the loginWith method on ParseUser accepts a name of provider, then a Map<String, dynamic> with the authentication details required. For Facebook and the example below, we used the library provided at https://pub.dev/packages/flutter_facebook_login

Future<void> goToFacebookLogin() async {
       final FacebookLogin facebookLogin = FacebookLogin();
       final FacebookLoginResult result = await facebookLogin.logInWithReadPermissions(['email']);
   
       switch (result.status) {
         case FacebookLoginStatus.loggedIn:
           final ParseResponse response = await ParseUser.loginWith(
               'facebook',
               facebook(result.accessToken.token,
                   result.accessToken.userId,
                   result.accessToken.expires));
   
           if (response.success) {
             // User is logged in, test with ParseUser.currentUser()
           }
           break;
         case FacebookLoginStatus.cancelledByUser:
               // User cancelled
           break;
         case FacebookLoginStatus.error:
               // Error
           break;
       }
     }

For Google and the example below, we used the library provided at https://pub.dev/packages/google_sign_in

class OAuthLogin {
  final GoogleSignIn _googleSignIn = GoogleSignIn( scopes: ['email', 'https://www.googleapis.com/auth/contacts.readonly'] );
  
  signInGoogle() async {
    GoogleSignInAccount account = await _googleSignIn.signIn();
    GoogleSignInAuthentication authentication = await account.authentication;
    await ParseUser.loginWith(
          'google',
          google(authentication.accessToken!, _googleSignIn.currentUser!.id,
              authentication.idToken!));
  }
}

Security for Objects – ParseACL

For any object, you can specify which users are allowed to read the object, and which users are allowed to modify an object. To support this type of security, each object has an access control list, implemented by the ParseACL class.

If ParseACL is not specified (with the exception of the ParseUser class) all objects are set to Public for read and write. The simplest way to use a ParseACL is to specify that an object may only be read or written by a single user. To create such an object, there must first be a logged in ParseUser. Then, new ParseACL(user) generates a ParseACL that limits access to that user. An object’s ACL is updated when the object is saved, like any other property.

ParseUser user = await ParseUser.currentUser() as ParseUser;
ParseACL parseACL = ParseACL(owner: user);
  
ParseObject parseObject = ParseObject("TestAPI");
...
parseObject.setACL(parseACL);
var apiResponse = await parseObject.save();

Permissions can also be granted on a per-user basis. You can add permissions individually to a ParseACL using setReadAccess and setWriteAccess

ParseUser user = await ParseUser.currentUser() as ParseUser;
ParseACL parseACL = ParseACL();
//grant total access to current user
parseACL.setReadAccess(userId: user.objectId, allowed: true);
parseACL.setWriteAccess(userId: user.objectId, allowed: true);
//grant read access to userId: 'TjRuDjuSAO' 
parseACL.setReadAccess(userId: 'TjRuDjuSAO', allowed: true);
parseACL.setWriteAccess(userId: 'TjRuDjuSAO', allowed: false);

ParseObject parseObject = ParseObject("TestAPI");
...
parseObject.setACL(parseACL);
var apiResponse = await parseObject.save();

You can also grant permissions to all users at once using setPublicReadAccess and setPublicWriteAccess.

ParseACL parseACL = ParseACL();
parseACL.setPublicReadAccess(allowed: true);
parseACL.setPublicWriteAccess(allowed: true);

ParseObject parseObject = ParseObject("TestAPI");
...  
parseObject.setACL(parseACL);
var apiResponse = await parseObject.save();

Operations that are forbidden, such as deleting an object that you do not have write access to, result in a ParseError with code 101: ‘ObjectNotFound’. For security purposes, this prevents clients from distinguishing which object ids exist but are secured, versus which object ids do not exist at all.

You can retrieve the ACL list of an object using:

ParseACL parseACL = parseObject.getACL();

Config

The SDK supports Parse Config. A map of all configs can be grabbed from the server by calling :

var response = await ParseConfig().getConfigs();

and to add a config:

ParseConfig().addConfig('TestConfig', 'testing');

Cloud Functions

The SDK supports call Cloud Functions.

Executes a cloud function that returns a ParseObject type

final ParseCloudFunction function = ParseCloudFunction('hello');
final ParseResponse result =
    await function.executeObjectFunction<ParseObject>();
if (result.success) {
  if (result.result is ParseObject) {
    final ParseObject parseObject = result.result;
    print(parseObject.className);
  }
}

Executes a cloud function with parameters

final ParseCloudFunction function = ParseCloudFunction('hello');
final Map<String, String> params = <String, String>{'plan': 'paid'};
function.execute(parameters: params);

Relation

The SDK supports Relation.

To add relation to object:

dietPlan.addRelation('fruits', [ParseObject("Fruits")..set("objectId", "XGadzYxnac")]);

To remove relation to object:

dietPlan.removeRelation('fruits', [ParseObject("Fruits")..set("objectId", "XGadzYxnac")]);

To Retrive a relation instance for user, call:

final relation = dietPlan.getRelation('fruits');

and then you can add a relation to the passed in object:

relation.add(dietPlan);
final result = await user.save();

To retrieve objects that are members of Relation field of a parent object:

QueryBuilder<ParseObject> query =
    QueryBuilder<ParseObject>(ParseObject('Fruits'))
      ..whereRelatedTo('fruits', 'DietPlan', DietPlan.objectId);

File

There are three different file classes in this SDK:

  • ParseFileBase is and abstract class and is the foundation of every file class that can be handled by this SDK.
  • ParseFile (former the only file class in the SDK) extends ParseFileBase and is by default used as the file class on every platform but web. This class uses a File from dart:io for storing the raw file.
  • ParseWebFile is the equivalent to ParseFile used at Flutter Web. This class uses an Uint8List for storing the raw file.

These classes are used by default to represent files, but you can also build your own class extending ParseFileBase and provide a custom ParseFileConstructor similar to the SubClasses.

Have a look at the example application for a small (non web) example.

When uploading or downloading a file, you can use the progressCallback-parameter to track the progress of the http request.

//A short example for showing an image from a ParseFileBase
Widget buildImage(ParseFileBase image){
  return FutureBuilder<ParseFileBase>(
    future: image.download(),
    builder: (BuildContext context,
    AsyncSnapshot<ParseFileBase> snapshot) {
      if (snapshot.hasData) {
        if (kIsWeb) {
          return Image.memory((snapshot.data as ParseWebFile).file);
        } else {
          return Image.file((snapshot.data as ParseFile).file);
        }
      } else {
        return CircularProgressIndicator();
      }
    },
  );
}

//A short example for storing a selected picture
//libraries: image_picker (https://pub.dev/packages/image_picker), image_picker_for_web (https://pub.dev/packages/image_picker_for_web)
PickedFile pickedFile = await ImagePicker().getImage(source: ImageSource.gallery);
ParseFileBase parseFile;
if (kIsWeb) {
  //Seems weird, but this lets you get the data from the selected file as an Uint8List very easily. 
  ParseWebFile file = ParseWebFile(null, name: null, url: pickedFile.path);
  await file.download();
  parseFile = ParseWebFile(file.file, name: file.name);
} else {
  parseFile = ParseFile(File(pickedFile.path));
}
someParseObject.set("image", parseFile);
//This saves the ParseObject as well as all of its children, and the ParseFileBase is such a child. 
await someParseObject.save();

Other Features of this library

Main:

  • Installation (View the example application)
  • GeoPoints (View the example application)
  • Persistent storage
  • Debug Mode – Logging API calls
  • Manage Session ID’s tokens

User:

  • Queries
  • Anonymous (View the example application)
  • 3rd Party Authentication

Objects:

  • Create new object
  • Extend Parse Object and create local objects that can be saved and retreived
  • Queries

Author:-

This project was authored by Phill Wiggins. You can contact me at phill.wiggins@gmail.com

GitHub

View Github