AngularJS 1.x custom filter can't be injected, unknown provider

Question

I\'m trying to create a custom filter, but when I try to inject it into my controller, I get an \'Unknown provider\' error. I have checked and double checked all the references,

Answer 1

According to Angular's documentation :

if you want to use your filter in a template

then you just need to inject it in your module and then use it like this {{ expression | filter }} or {{ expression | filter:argument1:argument2:... }} .

doc

if you want to use your filter in a controller, directive, and stuffs :

inject a dependency with the name Filter, like this :

controller('MyController', ['filterFilter', function(filterFilter) {}]);

doc

so for this particular case :

angular.module('equiclass.controllers')
  .controller('CourseCtrl', function ($scope, testFilterFilter) {

  });