How to reuse parts of Eloquent builder in Laravel-CodePudding

Is there a way to reuse parts of a query in Laravel? For example if I have two queries which share some arbitrarily long section, can I create a function/variable that can be used in place of that section?

Toy queries:

$a = TableA::join('tableb', 'tablea.bid', '=', tableb.id)
           ->join('talbec', 'tableb.cid', '=', tablec.id)
           ->join('tabled', 'tablec.did', '=', tabled.id)
           ->where('tablea_col', '=', true)->get();

$b = TableA::join('tableb', 'tablea.bid', '=', tableb.id)
           ->join('talbec', 'tableb.cid', '=', tablec.id)
           ->join('tabled', 'tablec.did', '=', tabled.id)
           ->where('tableb_col', '=', true)->get();

I would like something like:

$shared = TableA::join('tableb', 'tablea.bid', '=', tableb.id)
           ->join('talbec', 'tableb.cid', '=', tablec.id)
           ->join('tabled', 'tablec.did', '=', tabled.id);

$a = shared->where('tablea_col', '=', true)->get();

$b = shared->where('tableb_col', '=', true)->get();

CodePudding user response：

From Laravel 8 , you can clone it then reuse as you wish:

$shared = TableA::join('tableb', 'tablea.bid', '=', tableb.id)
           ->join('talbec', 'tableb.cid', '=', tablec.id)
           ->join('tabled', 'tablec.did', '=', tabled.id);

$a = $shared->clone()->where('tablea_col', '=', true)->get();

$b = shared->clone()->where('tableb_col', '=', true)->get();

before Laravel 8, use

$a = clone $shared;
$b = clone $shared;
$a = $a->where('tablea_col', '=', true)->get();
$b = $b->where('tableb_col', '=', true)->get();

CodePudding user response：

You should be able to use a scope for this:

function scopeWithBCandD($query) {
    $query->join('tableb', 'tablea.bid', '=', 'tableb.id')
      ->join('talbec', 'tableb.cid', '=', 'tablec.id')
      ->join('tabled', 'tablec.did', '=', 'tabled.id');   
}

Which would permit:

TableA::withBCandD()->where('tablea_col', true)->get();
TableA::withBCandD()->where('tableb_col', true)->get();