Eloquent - using a closure with a relationship - php

Question

I have this problem with Laravel Eloquent.
I have two models - for simplicity's sake named:
A (id, name)
B (id, a_id, created_at)
relationship: A hasMany B
I need to return all B records filtered by these conditions:
A.name = given_name
B.created_at >= given_date
I want to do this by passing in a closure.
I searched through the laravel documentation on models:
https://laravel.com/docs/7.x/eloquent
https://laravel.com/docs/7.x/eloquent-relationships
and found these examples, but how do I put this together?
public function user()
{
return $this->belongsTo('App\User')->withDefault(function ($user, $post) {
$user->name = 'Guest Author';
});
}
function (Builder $builder) {
$builder->where('age', '>', 200);
}

Answer 1

You can do it using whereHas but first you need to define the relationship in your models like so:
A Model
class A extends Model
{
/**
* Get all B for the A.
*/
public function b()
{
return $this->hasMany(B::class);
}
}
B Model
class B extends Model
{
/**
* Get the B's A.
*/
public function a()
{
return $this->belongsTo(A::class);
}
}
Now after we defined the relationships just use whereHas with a Closure to check for extra conditions:
$allB = B::whereHas('a', function (Builder $query) {
$query->where('A.name', $givenName);
})->where('created_at','>=',$givenDate)->get();

Answer 2

You need to write this on A model
class A extends Model
{
public function aToB()
{
return $this->hasMany('App\B', 'a_id', 'id');
}
}
Then you need to write the query
$userData = A::where('name', $givenName)->with('aToB');
$userData = $userData->whereHas('aToB', function($query) use($givenDate){
$query->whereDate('created_at', date('Y-m-d', strtotime($givenDate)));
});
$userData = $userData->get();
dd($userData->aToB);