Laravel where on relationship object

Question

I\'m developing a web API with Laravel 5.0 but I\'m not sure about a specific query I\'m trying to build.

My classes are as follows:

class Event exte         


        

Answer 1

    return Deal::with(["redeem" => function($q){
        $q->where('user_id', '=', 1);
    }])->get();

this worked for me

Answer 2

The correct syntax to do this on your relations is:

Event::whereHas('participants', function ($query) {
    return $query->where('IDUser', '=', 1);
})->get();

Read more at https://laravel.com/docs/5.8/eloquent-relationships#eager-loading

Answer 3

I created a custom query scope in BaseModel (my all models extends this class):

/**
 * Add a relationship exists condition (BelongsTo).
 *
 * @param  Builder        $query
 * @param  string|Model   $relation   Relation string name or you can try pass directly model and method will try guess relationship
 * @param  mixed          $modelOrKey
 * @return Builder|static
 */
public function scopeWhereHasRelated(Builder $query, $relation, $modelOrKey = null)
{
    if ($relation instanceof Model && $modelOrKey === null) {
        $modelOrKey = $relation;
        $relation   = Str::camel(class_basename($relation));
    }

    return $query->whereHas($relation, static function (Builder $query) use ($modelOrKey) {
        return $query->whereKey($modelOrKey instanceof Model ? $modelOrKey->getKey() : $modelOrKey);
    });
}

You can use it in many contexts for example:

Event::whereHasRelated('participants', 1)->isNotEmpty(); // where has participant with id = 1 

Furthermore, you can try to omit relationship name and pass just model:

$participant = Participant::find(1);
Event::whereHasRelated($participant)->first(); // guess relationship based on class name and get id from model instance

Answer 4

@Cermbo's answer is not related to this question. In their answer, Laravel will give you all Events if each Event has 'participants' with IdUser of 1.

But if you want to get all Events with all 'participants' provided that all 'participants' have a IdUser of 1, then you should do something like this :

Event::with(["participants" => function($q){
    $q->where('participants.IdUser', '=', 1);
}])

N.B:

in where use your table name, not Model name.

Answer 5

With multiple joins, use something like this code:

$someId = 44;
Event::with(["owner", "participants" => function($q) use($someId){
    $q->where('participants.IdUser', '=', 1);
    //$q->where('some other field', $someId);
}])

Answer 6

[OOT]

A bit OOT, but this question is the most closest topic with my question.

Here is an example if you want to show Event where ALL participant meet certain requirement. Let's say, event where ALL the participant has fully paid. So, it WILL NOT return events which having one or more participants that haven't fully paid .

Simply use the whereDoesntHave of the others 2 statuses.

Let's say the statuses are haven't paid at all [eq:1], paid some of it [eq:2], and fully paid [eq:3]

Event::whereDoesntHave('participants', function ($query) {
   return $query->whereRaw('payment = 1 or payment = 2');
})->get();

Tested on Laravel 5.8 - 7.x