如何在Laravel和Eager负载关系中将多个个体雄辩模型合并为一个模型

Question

I have many individual models and I want to combine them all to take advantage of eagerloading.

$match_query = "select * from feeds " .
                "WHERE (user_id IN ($users_size)) " .
                "OR (target_id IN ($slugs_size) AND feedable_type = 'review') " .
                "ORDER BY created_at DESC LIMIT 5;";

//Query works fine and return 2 results 
$results = DB::select($match_query, $consolidatedArray);

    //to convert returned php standard obj to array
    $results = json_decode(json_encode($results), True);

    $all = [];

    foreach($results as $result){
        $x = new \App\Feed($result);

        //I am able to get relation like this for single item
        // $x->user;

        $all[] =  $x;
    }

    //but this thing is not working (i am trying to eager load)
    $data = $all->with('user');

I get the following error

ErrorException in FeedsRepository.php line 67:
Trying to get property of non-object

What is the solution?

Answer 1

$all is an array. Array is not an object. So when you call $all->with(), you get an error "Trying to get property of non-object". Pretty straightforward :).

Your code seems to be needlessly convoluted. You query is not too hard to do in Eloquent and Query Builder. Read a bit of documentation and start using its awesome features instead of hacking your way around that :).

You code could be replaced with this much more readable snippet (or something like this):

$results = Feed::whereIn('user_id', $users_size)
            ->orWhere(function($q) use($slugs_size) {
                $q->whereIn('target_id', $slugs_size)->orWhere('feedable_type', 'review');
            })
            ->with('user')
            ->orderBy('created_at', 'desc')->take(5)->get();

The important thing to remember here is that eloquent also packs all the power of query builder. In most cases it will be easier to read and maintain than full SQL queries.

Reading material:

https://laravel.com/docs/master/eloquent

https://laravel.com/docs/master/queries