How to filter json using angular filter

Question

Hey i have little problem with angular filter. I import post from wordpress, and i would really like to filter them by tags, like, now show only post with tag = ENG, or show only post with tag = GER. This is how my html looks like

    <div ng-controller="ThreeMainPosts">
        <div ng-repeat="threePost in threePosts | filter : {data.data.posts[0].tags[0].slug = 'ENG'} ">
            <div three-post="threePost">
                <h1>CONTENT</h1></div>
        </div>
    </div>

Controller

myModule.controller('ThreeMainPosts', function($scope, $location, WordPressNewsService) {
var postsPerPage = 3;
var orderBy = 0;
WordPressNewsService.getPosts(postsPerPage, orderBy).then(function(data) {
    $scope.threePosts = data.data.posts;
});

}); and the json

    { id: 312, type: "post", slug: "la-bamba-3", url: "sada2", … }
    attachments:[]
    author:{ id: 1, slug: "ds", name: "hnews", first_name: "", last_name: "", … }
    categories:[{ id: 6, slug: "ludzie", title: "Ludzie", description: "", parent: 0, post_count: 2 }]
    tags: [{ id: 32, slug: "en", title: "EN", description: "EN", post_count: 1 }]
    url:"http://xxx0.co,/?p=312"
    previous_url:"http://hirsch-news.iterative.pl/?p=306"
    status:"ok"

I tried make the filter in the controller but i can only do this for single element, for example:

if(data.data.posts[0].tags[0].slug == "ENG"){
    $scope.threePosts = data.data.posts;
}

Any ideas guys? Have nice day! :)

Answer 1

Made a quick filter, can change it up to your needs. Hope it helps. Angular $filter Docs

Here's a Codepen with angular's built in $filter.

myModule
  .controller('ThreeMainPosts', function($scope, $location, WordPressNewsService, $filter) {
    var postsPerPage = 3;
    var orderBy = 0;
    var tagToSortBy = 'EN'
    WordPressNewsService.getPosts(postsPerPage, orderBy).then(function(data) {
      $scope.threePosts = $filter('postFilter')(data.data.posts, tagToSortBy);
    });
  })
  .filter('postFilter', function() {
    return function(post, tag) {
      if (post.tags.slug === tag) {
        return post;
      }
    };
  });

If you wanted to do this in the template it would be like this.

<div ng-controller="ThreeMainPosts">
  <div ng-repeat="post in threePosts | postFilter : 'ENG' ">
    <div three-post="threePost">
      <h1>CONTENT</h1>
    </div>
  </div>
</div>