How to get latest eloquent relationship by column name in Laravel - laravel

Question

I am building a small application on Laravel 5.6 where I am having two models Project and Status. In this I am having a relation as such:
In Project Model I am having:
public function statusUpdate()
{
return $this->hasMany('App\Status','project_id','id');
}
and to retrieve latest status I have:
public function latestStatus()
{
return $this->hasOne('App\Status','project_id','id')->latest();
}
In status I have columns: date, status, sub_status, comments.
I want to retrieve Status where I am having latest status by date mentioned in the column
I tried doing this in my model:
public function latestStatus()
{
return $this->hasOne('App\Status','project_id','id')->latest('date');
}
But this thing is not working out, help me out in this. Thanks
edit
I am using this relation in eager loading something like this:
Project::when( $request->name , function( $q) use( $request ) {
$q->where('name', 'like', '%' . $request->name .'%');
})->with('latestStatus')
->orderBy($request->sort_by_col, $request->order_by)
->paginate(30);

Answer 1

You can use orderBy in the relationship.
public function latestStatus()
{
return $this->hasOne('App\Status','project_id','id')->orderBy('date', 'desc');
}
Try it out.

Answer 2

You got your models wrong. This is what should be in the Project model
public function statuses() //plural because a project has many statuses
{
return $this->hasMany('App\Status','id','project_id');
}
If you want the latest status, call this in your controller:
Project::where('name', 'like', "%{$request->name}%")->with('statuses', function($q) {
return $q->orderBy('date', $request->order_by);
})->paginate(30);
If you want the latest project where the status has changed, first the Status model:
public function project()
{
return $this->hasOne('App\Project','project_id','id');
}
And in your controller:
$project = Status::latest()->first()->project;

Answer 3

Add first to the end of the query.
public function latestStatus()
{
return $this->hasOne('App\Status','project_id','id')->latest()->first();
}
This is how it works
The statusUpdate method builds the query and does the setup for has many relationship
The latest method adds the order by clause
The first methods adds the limit 1 clause, then executes the query and returns the first result