Angular keeps throwing an error saying "Provider not found" when trying to inject a factory

Issue:

Encountering an Unknown Provider Error in Angular App for: UnitProvider <- Unit

Error Details:

Error: [$injector:unpr] Unknown provider: UnitProvider <- Unit

Codepen Link:

View LIVE CODE Example


I recently came across a fascinating video about Angular on YouTube titled:

Crafting the Perfect AngularJS Model and Making it Real Time

Find more info on Github: Repo


Insight:

Feeling motivated after watching the video, I believe I grasp the concept and outcome of this method, but I'm struggling to connect all the dots. Any additional comments or explanations would greatly assist me!

Code:

JavaScript Code:

angular.module('Modelbuildr', []).config(function() {});
var app = angular.module('Modelbuildr');

app.controller("MainCtrl", function($scope, Unit)           
{
  $scope.name = "world";
  $scope.units = Unit;
  var vecA = [1,2,3,4,5];

    $scope.vecB = _.map(vecA, function(num){
      return num * 2;
    });
});

function Resource($http, path) {
    _.extend(this, {
      _http: $http,
      _path: path
    });
}

Resource.$factory =  ['$http', function($http) {
    return function(path) {
      return new Resource($http, path);
    };
}];

app.factory('bdResource', Resource.$factory);

Resource.prototype.find = function(uid) {
    var deferred = Q.defer();

    this._http.get(this.path(uid))
      .success(deferred.resolve)
      .error(deferred.reject);

    return deferred.promise;
};

Resource.prototype.path = function(uid) {
    return uid ? this._path + '/' + uid : this._path;
};

Resource.prototype.set = function(uid, newValue) {
    var deferred = Q.defer();
    var path = this._path + '/' + uid;

    this._http
      .put(path, newValue)
      .success(deferred.resolve)
      .error(deferred.reject);

    return deferred.promise;
};


function Unit(futureUnitData) {

    if (!futureUnitData.inspect) {
      _.extend(this, futureUnitData);
      return;
    }

    this.$unwrap(futureUnitData);
}

Unit.$factory = ['$timeout', 'bdResource', function($timeout, Resource) {
    _.extend(Unit, {
      $$resource: new Resource('/units'),
      $timeout: $timeout
    });

    return Unit;
}];

angular.module('Modelbuildr').factory('bdUnit', Unit.$factory);

Unit.$find = function(uid) {

    var futureUnitData = this.$$resource.find(uid);

    if (uid) return new Unit(futureUnitData);

    return Unit.$unwrapCollection(futureUnitData);
};

Unit.prototype.$unwrap = function(futureUnitData) {
    var self = this;

...

**HTML Code:**

<body ng-app="Modelbuildr" ng-controller="MainCtrl">
  <h1>Empty Angular App</h1>
  Hello {{name}}.
  Lo-dash {{vecB}}.
</body>

Answer №1

When incorporating the Unit into angular's module, it is defined as bdUnit:

angular.module('Modelbuildr').factory('bdUnit', Unit.$factory);

Therefore, when utilizing it, make sure to do so in the following manner:

app.controller("MainCtrl", function($scope, bdUnit) { .. });

Alternatively, you can explicitly instruct angular to rename bdUnit as Unit:

app.controller("MainCtrl", ['$scope', 'bdUnit', function($scope, Unit) {
  ..
}]);

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