eloquent querybuilder pass column to nested query - database

Question

I would like to query the db to retrieve all events that do not have a comment created after the start date. Following structure for EVENT and COMMENT
EVENT
id
start
created_at
updated_at
COMMENT
id
comment
event_id
created_at
updated_at
Create a query ( $query = Event::query()->with('comments'); ) which gives me the following construct.
[{
"id": 1,
"start": "2018-06-18 12:00:00",
"created_at": "2018-06-18 11:50:07",
"updated_at": "2018-07-02 12:13:15",
"comments": [
{
"id": 1,
"created_at": "2018-06-18 12:44:35",
"updated_at": "2018-06-18 12:44:35",
"comment": "cascsac"
}
]
}]
I want to retrieve all entries where comment.created_at is after the start date of the event. I tried with the following:
$query->orWhere(function ($query) {
$value = $query->where(function ($query) use ('start') {
$query->whereHas('comments', function ($query) use ('start') {
$query->where('created_at','<=','start');
//->whereColumn('created_at', '<=', 'start');
});
});
});
But its does not like my attempts to pass start to a nested query and am not sure how to pass it for whereColumn query.
How do I pass values from columns to a nested where.
Or how else do I query a with the value of a separate column.
Edit1
On request the whole query
$query
Event::query()->with('comments');
$query->orWhere(function ($query) {
$value = $query->where(function ($query) use ('start') {
$query->whereHas('comments', function ($query) use ('start') {
$query->where('created_at','>=','start');
//->whereColumn('created_at', '>=', 'start');
});
});
});
$events = $query->get();
Passing variable $start would work too but I cannot convert column value of start to variable $start to pass the nested query

Answer 1

Answered on https://laracasts.com/discuss/channels/eloquent/querybuilder-pass-column-to-nested-query
$events = Event::with('comments')->whereHas('comments',function ($query) {
$query->whereColumn('comments.created_at','<','events.start');
})->get();
whereColumn is function to compare columns in query.

Answer 2

Wrong code is 'start'> It must be $start
$start = Carbon::now()->subYears(100); // for examplee
$query->orWhere(function ($query) {
$value = $query->where(function ($query) use ($start) {
$query->whereHas('comments', function ($query) use ($start) {
$query->where('created_at','<=', $start);
//->whereColumn('created_at', '<=', $start);
});
});
})