Laravel: Query across relation-defined table - laravel

Question

I have $donor, which is the Donor model.
Also, I have Log that is associated with Donor as defined by this relationship in the Donor model:
public function Log(){
return $this->hasMany(Log::class,'DonorID','DonorID');
}
$donor->load('Log');, which eager load the Donor with all Log associated to it, would return this following
{
"DonorID": "59060001",
"DonorCitizenID": "1000000000009",
"DonorPrefix": "Mx.",
"DonorName": "John",
"DonorSurname": "Smith",
"created_at": "2016-06-21 08:06:44.000",
"updated_at": "2016-06-23 02:15:10.000",
"log": [
{
"LogID": 6,
"DonorID": "59060001",
"EventTypeID": "1",
"EventDate": "2016-06-15",
"EventBrief": "Donor Added",
"created_at": "2016-06-15 06:01:06.000",
"updated_at": "2016-06-15 06:01:06.000"
},
{
"LogID": 21,
"DonorID": "59060001",
"EventTypeID": "2",
"EventDate": "2016-06-23",
"EventBrief": "Donor has rested in peace.",
"created_at": "2016-06-23 02:30:49.000",
"updated_at": "2016-06-23 02:30:49.000"
}
]
}
Now, I have this code of query that takes the inputted text from the field, finds the specific donor, and returns it.
$donors = Donor::
where('DonorCitizenID', 'LIKE', '%'.Input::get('DonorCitizenID').'%')->
where('DonorName', 'LIKE', '%'.Input::get('DonorName').'%')->
where('DonorSurname', 'LIKE', '%'.Input::get('DonorSurname').'%')->
get();
It does as it says, get all the Donors, only if it match the several criteria, and it worked well, as long as the data I matched is stored in the Donor.
But, I want another search field. This one would match the latest Log (as one Donor can has many Logs) in any donor by matching the EventTypeID in the loaded Log. How can I write the condition to do this?
Please kindly note that the returned value is expected to be the list of all Donors matching the criteria.

Answer 1

its should be done like this if i understood what you are saying
edit
$donors = Donor::
where('DonorCitizenID', 'LIKE', '%'.Input::get('DonorCitizenID').'%')
->where('DonorName', 'LIKE', '%'.Input::get('DonorName').'%')
->where('DonorSurname', 'LIKE', '%'.Input::get('DonorSurname').'%')
->with(['Log' => function ($query) {
$query->where('EventType', 'LIKE', '%'.Input::get('EventType').'%')->get();
}])->get();
$donor->Log // result

Answer 2

Use whereHasmethod
$donors = Donor::
where('DonorCitizenID', 'LIKE', '%'.Input::get('DonorCitizenID').'%')
->where('DonorName', 'LIKE', '%'.Input::get('DonorName').'%')
->where('DonorSurname', 'LIKE', '%'.Input::get('DonorSurname').'%')
->whereHas('Log', function ($query) {
$query->where('EventType', 'LIKE', '%'.Input::get('EventType').'%');
})->get();