mysql - Relation not loaded when using column constraint in find -


i have strange problem eloquent. let me give code first , explain: 

$article = article::with('comment.reply')->find($id)->tojson();

this query supposed do. loads data articles table, loads comments comments table , replies replies table , spits out in json. everything's great. 

$article = article::with('comment.reply')->find($id, array('short_title'))->tojson();

theoretically query should exact same thing limitation short_title being loaded articles table, right? guess again. happens short title being loaded, comments table gets queried somehow magically returns empty result , replies table ignored.

do have wrong expectations or doing wrong here? relationships relatively simple, articles->hasmany('comments') , comments->hasmany('replies').

the problem don't select keys, , needed eloquent build collection. this:

$article = article::with('comment.reply')->find($id, array('id', 'short_title'))->tojson();

should query loaded relations need select parent key (article_id, comment_id etc) well


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