Search in belongsToMany-relation for item by pivot value - laravel

Question

I got these models:
Order
Invoice
An Order can have many Invoices and an Invoice can belong to many Orders.
Example:
Orders:
Order #1
Order #2
Order #3
Invoices:
Invoice #1 -> belongs To Order #1 and Order #2 (so this Invoice contains both Orders)
Invoice #2 -> belongsTo Order #2 and Order #3
Each belongsTo-relation saves a date as pivot, which defines the last date this order has been invoiced.
Now I'd like to create a isInvoiceable() getter for my Order-Model, which returns, whether the order has been invoiced within the last month or not. If the latest date is older than one month, return true, as this Order should create a new invoice.
So now I need your help: I need to check all invoices, whether there's an Order (belongsToMany) with the order_id of the current Order, and a date-pivot that's older than now - one month. I need to check the order_id because the Invoice could possibly contain information about other Orders, too.
And this is the missing link for me: How can I check the belongsToMany-relation in Invoice for date and order_id?

Answer 1

Asuming you have defined your relation as 'invoices', you may do something like this:
class Order extends Model {
...
public function isInvoiceable(){
$lastInvoiceDate = (date('Y-m-d', $this->invoices()->latest()->created_at));
$today = new Carbon(date('Y-m-d', strtotime(Input::get('startdate'))));
$diff_months = $lastInvoiceDate->diff($today)->months;
return $diff_months < 1;
}

Answer 2

There is a wherePivot method, which should do what you want.
From the docs:
Filtering Relationships Via Intermediate Table Columns:
You can also filter the results returned by belongsToMany using the
wherePivot, wherePivotIn, and wherePivotNotIn methods when defining
the relationship:
return $this->belongsToMany('App\Role')->wherePivot('approved', 1);
return $this->belongsToMany('App\Role')->wherePivotIn('priority', [1, 2]);
return $this->belongsToMany('App\Role')->wherePivotNotIn('priority', [1, 2]);
I have not tested it, but you should be able to do something like this:
public function isInvoiceable()
{
// replace 'invoices()' with your relationship
if ($this->invoices()->wherePivot('date', '>=', Carbon::now()->subMonth())->count() > 0) {
return false;
}
return true;
}

Answer 3

you have two choices:
1- like Remul said in his answer: using wherePivot();
2- using newPivotQuery()
witch give you more space to work with ...
when you use this method, the query will be on pivot table directly ...
class Order extends Model {
public function isInvoiceable()
{
return $this->invoices()-> newPivotQuery()->firstWhere('date', '>=', Carbon::now()->subMonth())!=null;
}
the advantage of using newPivotQuery() that you can insert,update, make overall queries ...