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Laravel – query builder – left join polymorphic relationship, distinct only

Asked By: Anonymous

So I’m using Vue 2.0 and Laravel 5.3 to create an application.

I’ve implemented my own sortable table with Vue, using the built-in pagination provided by Laravel.

Everything’s working perfect – except, I’m trying to left join a “media” polymorphic table, so I can show an image in my table.

To enable sorting, I’ve had to use the query builder, as you can’t sort on a relationship using Eloquent (AFAIK).

I define my relationships like:

$inventories = $inventories->leftjoin('users as inventory_user', 'inventories.user_id', '=', '');
$inventories = $inventories->leftjoin('categories as category', 'inventories.category_id', '=', '');
$inventories = $inventories->leftjoin('inventories as parent', 'inventories.parent_id', '=', '');

Which work great. However, how exactly do I left join a polymorphic relationship, without repeating (duplicating) any of the rows?

I’ve got this:

$inventories = $inventories->leftJoin('media', function($q) {
    $q->on('media.model_id', '=', '');
    $q->where('media.model_type', '=', 'AppModelsInventory');

Which does show media (if it has a relation in the polymorphic table). However, if for instance I have 5 images (media) for 1 particular inventory item, my query repeats the inventory for however media there are, which in my case it’s repeated 5 times.

This is my select query:

    $inventories = $inventories->select(DB::raw("
   as inventory_id,
   as inventory_name,
            inventories.order_column as inventory_order_column,
   as category_id,
   as category_name,
   as parent_name,
   as parent_id,
            inventories.updated_at as inventory_updated_at,

I think I need to use a groupBy, but I’m not sure where I define it. If I do

$inventories = $inventories->groupBy('');

I get
SQLSTATE[42000]: Syntax error or access violation: 1055 '' isn't in GROUP BY...

Has anyone been in a similar situation or know where to put my groupBy to show 1/distinct inventory items?


I was able to fix by using:

$inventories = $inventories->leftJoin('media', function($q) {
    $q->on('media.model_id', '=', '');
    $q->where('media.model_type', '=', 'AppModelsInventory');
    $q->orderBy('media.order_column', 'asc');

and then setting strict => false in my database.php.


Answered By: Anonymous

As the error states this issue occurs when name column not being in GROUP BY clause.

To solve this change

'strict' => true, 

In mysql configuration under connections in your config/database.php file to

'strict' => false,

Additionally I would highly encourage to use polymorphic relations over left join with eloquent.

techinplanet staff

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