[Firebase] 4. Firebase Object related Database

The idea: This post we are going to learn how to build a Firebase Forage with object related database.

Form the pic we can see that there are two object: users and items. This helps to orginzie the datastructure better.

The way to do this is following:

We have a base firebase uri

app.constant('FIREBASE_URI', 'https://zhentiw-angular-fire.firebaseio.com/');

Here we create a users object database:

var userRef = new Firebase(FIREBASE_URI + 'users');

Here is how we create a items object database:

var ref = new Firebase(FIREBASE_URI + 'items');

Yeap, it is quite simple and not hard at all. But for the beginner we have comfuses at the begining.

Here is an example how we add data into those two objects.

We have an select tag for display all users.

        <select class="form-control" ng-model="currentUser" ng-options="userId as user.name for (userId, user) in users">
            <option value="">Select a user</option>
        </select>

Notice the words here:

　　userId as user.name for (userId, user) in users, looks like coffeeScript

Then forms for add users and items, and also for displaying items.

Code:

<!DOCTYPE html>
<html ng-app="app">
<head lang="en">
    <meta charset="UTF-8">
    <title>Angular Firebase</title>
    <link href="bower_components/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet"/>
    <link href="bower_components/angular-material/angular-material.min.css" rel="stylesheet" />
</head>
<body ng-controller="MainCtrl">
<ui-view>
    <button class="btn-info" ui-sref="login()">FirebaseSimpleLogin</button>
    <h2>Current User</h2>
    <div class="well">
        <select class="form-control" ng-model="currentUser" ng-options="userId as user.name for (userId, user) in users">
            <option value="">Select a user</option>
        </select>
        <h3>Add User</h3>
        <form class="form-inline" role="form" novalidate ng-submit="addUser()">
            <div class="form-group">
                <input type="text" class="form-control" ng-model="newUser.name" placeholder="Name">
            </div>
            <button type="submit" class="btn btn-default">Add</button>
        </form>
    </div>

    <h2>Current Item</h2>
    <table class="table edit">
        <thead>
        <tr>
            <th>Name</th>
            <th>Description</th>
            <th>Count</th>
            <th></th>
        </tr>
        </thead>
        <tbody>
        <tr ng-repeat="(id, item) in items">
            <td><input type="text" ng-model="item.name" ng-blur="updateItem(id)"/></td>
            <td><input type="text" ng-model="item.description" ng-blur="updateItem(id)"/></td>
            <td><input type="text" ng-model="item.count" ng-blur="updateItem(id)"/></td>
            <td>
                <a href="#" ng-click="removeItem(id)" class="navbar-link">Remove</a>
            </td>
        </tr>
        </tbody>
    </table>

    <div class="well">
        <h4>Add Item</h4>

        <form class="form-inline" role="form" novalidate ng-submit="addItem()">
            <div class="form-group">
                <input type="text" class="form-control" ng-model="newItem.name" placeholder="Name">
            </div>
            <div class="form-group">
                <input type="text" class="form-control" ng-model="newItem.description" placeholder="Description">
            </div>
            <div class="form-group">
                <input type="text" class="form-control" ng-model="newItem.count" placeholder="Count">
            </div>
            <button type="submit" class="btn btn-default">Add</button>
        </form>
    </div>

</ui-view>


<script src="bower_components/jquery/dist/jquery.min.js"></script>
<script src="bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
<script src="bower_components/angular/angular.min.js"></script>
<script src="bower_components/angular-material/angular-material.js"></script>
<script src="bower_components/firebase/firebase.js"></script>
<script src="https://cdn.firebase.com/libs/angularfire/0.6.0/angularfire.js"></script>
<script src="bower_components/angular-ui-router/release/angular-ui-router.min.js"></script>
<script src="bower_components/oclazyload/dist/ocLazyLoad.min.js"></script>
<script src="public/js/app.js"></script>
</body>
</html>

/**
 * Created by Answer1215 on 11/9/2014.
 */

var app = angular.module('app', ['ui.router','firebase', 'oc.lazyLoad']);

app.constant('FIREBASE_URI', 'https://<your app>.firebaseio.com/');

app.config(function($stateProvider){
    $stateProvider
        .state('login', {
            url: '/login',
            templateUrl: 'public/login.tmpl.html',
            controller: 'LoginCtrl',
            resolve: {
                'login@': function($ocLazyLoad){
                    return $ocLazyLoad.load(
                        {
                            name: "login",  //module name is "store"
                            files: ["public/js/login.js",
                            'bower_components/firebase-simple-login/firebase-simple-login.js']
                        }
                    )
                }
        }});
});

app.controller('MainCtrl', ['$scope', 'ItemsService', 'UserService',function ($scope, ItemsService, UserService) {
    $scope.newItem = { name: '', description: '', count: 0 };
    $scope.newUser = {name: ''};
    $scope.currentItem = null;
    $scope.isUpdated = false;

    $scope.items = ItemsService.getItems();
    $scope.users = UserService.getUsers();

    $scope.items.$on('change', function(){
        if(!$scope.isUpdated){return;}
        console.log("ITEMS CHANGE");
    });

    $scope.items.$on('loaded', function(){
        console.log("ITEMS LOADED");
    });

    //Deattach the change event from the items
    //$scope.items.$off('change');


    $scope.addItem = function () {
        ItemsService.addItem(angular.copy($scope.newItem));
        $scope.newItem = { name: '', description: '', count: 0 };
    };

    $scope.updateItem = function (id){
        $scope.isUpdated = true;
        ItemsService.updateItem(id);
    };

    $scope.removeItem = function (id) {
        ItemsService.removeItem(id);
    };

    $scope.addUser = function(){
        UserService.addUser(angular.copy($scope.newUser));
        $scope.newUser = {name: ''};
    }
}]);

app.factory('UserService', ['$firebase', 'FIREBASE_URI', function ($firebase, FIREBASE_URI) {
    var userRef = new Firebase(FIREBASE_URI + 'users');
    var users = $firebase(userRef);

    var getUsers = function () {
        return users;
    };

    var addUser = function (user) {
        users.$add(user);
    };


    return {
        getUsers: getUsers,
        addUser: addUser
    }
}]);

app.factory('ItemsService', ['$firebase', 'FIREBASE_URI', function ($firebase, FIREBASE_URI) {
    var ref = new Firebase(FIREBASE_URI + 'items');
    var items = $firebase(ref);

    var getItems = function () {
        return items;
    };

    var addItem = function (item) {
        items.$add(item);
    };

    var updateItem = function (id) {
        items.$save(id);
    };

    var removeItem = function (id) {
        items.$remove(id);
    };

    return {
        getItems: getItems,
        addItem: addItem,
        updateItem: updateItem,
        removeItem: removeItem
    }
}]);

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