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I've been trying out Angular JS for the past couple of days and one thing I can't figure out is how to work with relationships between models.
The project I'm working on has a Users model and an Accounts model. I have it set up on my database that each Account has a field called 'ownedBy' which is a foreign key reference to the id of the user that owns that account.
In Angular I have the following set up in a file called main.js
var myApp = angular.module('myApp', ['ngResource']); var Users = myApp.factory('Users', function($resource) { var User = $resource('http://api.mydomain.ca/users/:id', {id:'@id'}, {}); return User; }); var Accounts = myApp.factory('Accounts', function($resource) { var Accounts = $resource('http://api.mydomain.ca/accounts/:id', {id:'@id'}, {}); return Accounts; }); function UsersCtrl($scope, Users) { $scope.users = Users.query(); } function AccountsCtrl($scope, Accounts) { $scope.accounts = Accounts.query(); } and the following template
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <title>Angular Test</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="stylesheet" href="/bootstrap/css/bootstrap.min.css?v=2.2.1"> </head> <body> <div ng-app="myApp"> <div ng-controller="UsersCtrl"> <table class="table table-striped"> <thead> <tr> <th>ID</th> <th>First Name</th> <th>Last Name</th> </tr> </thead> <tbody> <tr ng-repeat="user in users"> <td>{{user.id}}</td> <td>{{user.firstName}}</td> <td>{{user.lastName}}</td> </tr> </tbody> </table> </div> <div ng-controller="AccountsCtrl"> <table class="table table-striped"> <thead> <tr> <th>ID</th> <th>Owned By</th> </tr> </thead> <tbody> <tr ng-repeat="account in accounts"> <td>{{account.id}}</td> <td>{{account.ownedBy}}</td> </tr> </tbody> </table> </div> </div> <script src="http://code.jquery.com/jquery-latest.js"></script> <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.4/angular.min.js"></script> <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.4/angular-resource.min.js"></script> <script src="/bootstrap/js/bootstrap.min.js?v=2.2.1"></script> <script src="js/main.js"></script> </body> </html> and this is working. It pulls a JSON resource from my REST server and displays it in a table. What's the next step I need to take to end up with one table that shows users and their account numbers? (the equivalent of a database JOIN?) Is there a different way to do it for a one to many relationship? (ie... an account has many transactions)
Thanks for the help :)
541
$resource doesn't contain any way to deal with relationships that aren't handled by the server, but it's pretty simply with $http:
module.factory( 'UserService', function ( $http, $q ) { return { get: function getUser( id ) { // We create our own promise to return var deferred = $q.defer(); $http.get('/users/'+id).then( function ( user ) { $http.get('/accounts/'+user.id).then( function ( acct ) { // Add the account info however you want user.account = acct; // resolve the promise deferred.resolve( user ); }, function getAcctError() { deferred.reject(); } ); }, function getUserError() { deferred.reject(); } ); return deferred.promise; } }; }); And then in your controller, you can just use it like any other promise:
UserService.get( $scope.userId ).then( function ( user ) { $scope.user = user; }); And it's available for your template!
<div> User: "{{user.firstName}} {{user.lastName}}" with Acct ID "{{user.acct.id}}". </div> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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