Support Relation (parse-community#179)

* create CoreStore interface to allow different implements for local storage (parse-community#166)

implement default local store using sembast and with encryption using XXTEA algorithm

add desktop support in example project

* make parse shared preferences default store (parse-community#168)

* add decion page to detect parse server availability
throw execption if server url is empty
navigate to correct page base on current user state

* working on example

throw exception if sever url is empty 
add decision page to check availability of parse server

 navigate to screen base on current user state

* create example flow for login and signup
display list of diet plan items and allow to remove and update it's status

* add shared preferences corestore
fix bug when create custom corestore implementation

* use shared shared preferences in example

* make parse shared preferences default store

* Update application_constants.dart

* README.md updated from https://stackedit.io/

* Support Relation.

* delete vscode config

* Update .gitignore

Author: yulingtianxia

.gitignore

@@ -10,3 +10,5 @@ build/
 .idea
 example/ios/Frameworks/
 example/lib/ui/
+
+.vscode/

README.md

@@ -25,7 +25,14 @@ Parse().initialize(
         ApplicationConstants.keyApplicationId,
         ApplicationConstants.keyParseServerUrl);
 ```
+if you want to use secure storage also that's allow using sdk on desktop application 
+```dart
 
+    Parse().initialize(keyParseApplicationId, keyParseServerUrl,
+        masterKey: keyParseMasterKey,
+        debug: true,
+        coreStore:  CoreStoreImp.getInstance());
+```
 It's possible to add other params, such as ...
 
 ```dart
@@ -530,6 +537,21 @@ final Map<String, String> params = <String, String>{'plan': 'paid'};
 function.execute(parameters: params);
 ```
 
+## Relation
+The SDK supports Relation.
+
+To Retrive a relation instance for user, call:
+```dart
+final relation = user.getRelation('dietPlans');
+```
+
+and then you can add a relation to the passed in object.
+
+```dart
+relation.add(dietPlan);
+final result = await user.save();
+```
+
 ## Other Features of this library
 Main:
 * Installation (View the example application)
@@ -552,5 +574,5 @@ Objects:
 ## Author:-
 This project was authored by Phill Wiggins. You can contact me at phill.wiggins@gmail.com
 <!--stackedit_data:
-eyJoaXN0b3J5IjpbNzE4NjUwNDIwXX0=
--->
+eyJoaXN0b3J5IjpbLTU4MDA4MDUwNCw3MTg2NTA0MjBdfQ==
+-->

example/assets/parse.png

@@ -44,9 +44,11 @@
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 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
 		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
+		5804EFBD11740E02FC51BC3E /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
 		7AFFD8ED1D35381100E5BB4D /* AppDelegate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
 		7AFFD8EE1D35381100E5BB4D /* AppDelegate.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
+		96499D95196B10F296043703 /* Pods-Runner.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.release.xcconfig"; path = "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"; sourceTree = "<group>"; };
 		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Debug.xcconfig; path = Flutter/Debug.xcconfig; sourceTree = "<group>"; };
 		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
 		9740EEBA1CF902C7004384FC /* Flutter.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Flutter.framework; path = Flutter/Flutter.framework; sourceTree = "<group>"; };

example/ios/Runner.xcodeproj/project.pbxproj

@@ -32,6 +32,6 @@ class DietPlan extends ParseObject implements ParseCloneable {
   num get fat => get<num>(keyFat);
   set fat(num fat) => set<num>(keyFat, fat);
 
-  int get status => get<int>(keyStatus);
-  set status(int status) => set<int>(keyStatus, status);
+  bool get status => get<bool>(keyStatus);
+  set status(bool status) => set<bool>(keyStatus, status);
 }

example/lib/data/model/diet_plan.dart

@@ -0,0 +1,97 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_plugin_example/data/repositories/diet_plan/provider_api_diet_plan.dart';
+import 'package:flutter_plugin_example/domain/constants/application_constants.dart';
+import 'package:parse_server_sdk/parse_server_sdk.dart';
+
+import 'home_page.dart';
+import 'login_page.dart';
+
+class DecisionPage extends StatefulWidget {
+  @override
+  _DecisionPageState createState() => _DecisionPageState();
+}
+
+class _DecisionPageState extends State<DecisionPage> {
+  String _parseServerState = 'Checking Parse Server...';
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _initParse();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: Container(
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            crossAxisAlignment: CrossAxisAlignment.center,
+            children: <Widget>[
+              _showLogo(),
+              const SizedBox(
+                height: 20,
+              ),
+              Center(
+                child: Text(_parseServerState),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _showLogo() {
+    return Hero(
+      tag: 'hero',
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(0.0, 70.0, 0.0, 0.0),
+        child: CircleAvatar(
+          backgroundColor: Colors.transparent,
+          radius: 48.0,
+          child: Image.asset('assets/parse.png'),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _initParse() async {
+    try {
+      Parse().initialize(keyParseApplicationId, keyParseServerUrl,
+          masterKey: keyParseMasterKey, debug: true);
+      final ParseResponse response = await Parse().healthCheck();
+      if (response.success) {
+        final ParseUser user = await ParseUser.currentUser();
+        if (user != null) {
+          _redirectToPage(context, HomePage(DietPlanProviderApi()));
+        } else {
+          _redirectToPage(context, LoginPage());
+        }
+      } else {
+        setState(() {
+          _parseServerState =
+              'Parse Server Not avaiable\n due to ${response.error.toString()}';
+        });
+      }
+    } catch (e) {
+      setState(() {
+        _parseServerState = e.toString();
+      });
+    }
+  }
+
+  Future<void> _redirectToPage(BuildContext context, Widget page) async {
+    final MaterialPageRoute<bool> newRoute =
+        MaterialPageRoute<bool>(builder: (BuildContext context) => page);
+
+    bool nav = await Navigator.of(context)
+        .pushAndRemoveUntil<bool>(newRoute, ModalRoute.withName('/'));
+    if (nav == true) {
+      _initParse();
+    }
+  }
+}

example/lib/pages/decision_page.dart

@@ -0,0 +1,133 @@
+import 'dart:convert';
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_plugin_example/data/base/api_response.dart';
+import 'package:flutter_plugin_example/data/model/diet_plan.dart';
+import 'package:flutter_plugin_example/data/repositories/diet_plan/contract_provider_diet_plan.dart';
+import 'package:parse_server_sdk/parse_server_sdk.dart';
+
+class HomePage extends StatefulWidget {
+  HomePage(this._dietPlanProvider);
+  final DietPlanProviderContract _dietPlanProvider;
+
+  @override
+  _HomePageState createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+  List<DietPlan> randomDietPlans = [];
+
+  @override
+  void initState() {
+    super.initState();
+    final List<dynamic> json = const JsonDecoder().convert(dietPlansToAdd);
+    for (final Map<String, dynamic> element in json) {
+      final DietPlan dietPlan = DietPlan().fromJson(element);
+      randomDietPlans.add(dietPlan);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return WillPopScope(
+      onWillPop: () async => false,
+      child: Scaffold(
+          appBar: AppBar(
+            automaticallyImplyLeading: false,
+            title: const Text('Parse Server demo'),
+            actions: <Widget>[
+              FlatButton(
+                  child: Text('Logout',
+                      style: TextStyle(fontSize: 17.0, color: Colors.white)),
+                  onPressed: () async {
+                    final ParseUser user = await ParseUser.currentUser();
+                    user.logout(deleteLocalUserData: true);
+                    Navigator.pop(context, true);
+                  })
+            ],
+          ),
+          body: _showDietList(),
+          floatingActionButton: FloatingActionButton(
+            onPressed: () async {
+              DietPlan dietPlan =
+                  randomDietPlans[Random().nextInt(randomDietPlans.length - 1)];
+              ParseUser user = await ParseUser.currentUser();
+              dietPlan.set('user', user);
+              await widget._dietPlanProvider.add(dietPlan);
+              setState(() {});
+            },
+            tooltip: 'Add Diet Plans',
+            child: const Icon(Icons.add),
+          )),
+    );
+  }
+
+  Widget _showDietList() {
+    return FutureBuilder<ApiResponse>(
+        future: widget._dietPlanProvider.getAll(),
+        builder: (BuildContext context, AsyncSnapshot<ApiResponse> snapshot) {
+          if (snapshot.hasData) {
+            if (snapshot.data.success) {
+              if (snapshot.data.results == null ||
+                  snapshot.data.results.isEmpty) {
+                return Center(
+                  child: const Text('No Data'),
+                );
+              }
+            }
+            return ListView.builder(
+                shrinkWrap: true,
+                itemCount: snapshot.data.results.length,
+                itemBuilder: (BuildContext context, int index) {
+                  DietPlan dietPlan = snapshot.data.results[index];
+                  String id = dietPlan.objectId;
+                  String name = dietPlan.name;
+                  String description = dietPlan.description;
+                  bool status = dietPlan.status;
+                  return Dismissible(
+                    key: Key(id),
+                    background: Container(color: Colors.red),
+                    onDismissed: (direction) async {
+                      widget._dietPlanProvider.remove(dietPlan);
+                    },
+                    child: ListTile(
+                      title: Text(
+                        name,
+                        style: TextStyle(fontSize: 20.0),
+                      ),
+                      subtitle: Text(description),
+                      trailing: IconButton(
+                          icon: status
+                              ? const Icon(
+                                  Icons.done_outline,
+                                  color: Colors.green,
+                                  size: 20.0,
+                                )
+                              : const Icon(Icons.done,
+                                  color: Colors.grey, size: 20.0),
+                          onPressed: () async {
+                            dietPlan.status = !dietPlan.status;
+                            await dietPlan.save();
+                            setState(() {});
+                          }),
+                    ),
+                  );
+                });
+          } else {
+            return Center(
+              child: const Text('No Data'),
+            );
+          }
+        });
+  }
+
+  String dietPlansToAdd =
+      '[{"className":"Diet_Plans","Name":"Textbook","Description":"For an active lifestyle and a straight forward macro plan, we suggest this plan.","Fat":25,"Carbs":50,"Protein":25,"Status":false},'
+      '{"className":"Diet_Plans","Name":"Body Builder","Description":"Default Body Builders Diet","Fat":20,"Carbs":40,"Protein":40,"Status":true},'
+      '{"className":"Diet_Plans","Name":"Zone Diet","Description":"Popular with CrossFit users. Zone Diet targets similar macros.","Fat":30,"Carbs":40,"Protein":30,"Status":true},'
+      '{"className":"Diet_Plans","Name":"Low Fat","Description":"Low fat diet.","Fat":15,"Carbs":60,"Protein":25,"Status":false},'
+      '{"className":"Diet_Plans","Name":"Low Carb","Description":"Low Carb diet, main focus on quality fats and protein.","Fat":35,"Carbs":25,"Protein":40,"Status":true},'
+      '{"className":"Diet_Plans","Name":"Paleo","Description":"Paleo diet.","Fat":60,"Carbs":25,"Protein":10,"Status":false},'
+      '{"className":"Diet_Plans","Name":"Ketogenic","Description":"High quality fats, low carbs.","Fat":65,"Carbs":5,"Protein":30,"Status":true}]';
+}