Total Participants for Client

Here's an example of how you can set this up:

1. **Client model**: A `Client` has many `Project` models.
2. **Project model**: A `Project` has many `Participant` models.
3. **Participant model**: Belongs to `Project`.

### Defining Relationships:

#### Client Model:

class Client extends Model
{
    public function projects()
    {
        return $this->hasMany(Project::class);
    }
}

#### Project Model:

class Project extends Model
{
    public function participants()
    {
        return $this->hasMany(Participant::class);
    }

    public function client()
    {
        return $this->belongsTo(Client::class);
    }
}

#### Participant Model:

class Participant extends Model
{
    public function project()
    {
        return $this->belongsTo(Project::class);
    }
}

### Query to Get Total Number of Participants:

You can use a query to count the participants for all projects that belong to a particular client. Here's how you can do it:

$client = Client::find($clientId); // Assuming you have the client ID
$totalParticipants = Participant::whereHas('project', function($query) use ($clientId) {
    $query->where('client_id', $clientId);
})->count();

### Explanation:
– `whereHas('project')`: Ensures we are selecting participants that belong to projects.
– `where('client_id', $clientId)`: Filters projects that belong to the specific client.
– `count()`: Returns the total number of participants for that client.

You can also access it directly from the `Client` model by chaining through relationships:

$totalParticipants = $client->projects()->withCount('participants')->get()->sum('participants_count');

This will give you the total number of participants for all projects under the given client.