Yii2 - Query count per day to ActiveRecord - php

Question

I have the following table structure and using Yii2 ActiveRecord methods I'd like to extract the number of bookings (OrderLine) a supplier has for each day for the next week (0 entries also required). So some way of getting a row per day per supplier, with num_bookings or potentially 0 depending on the supplier.
/--------------------\ /------------\
| OrderLine |------------------|Availability|
|--------------------| 0..n 1 |------------|
|ID {PK} | |ID {PK} |
|availabilityID {FK} | |start |
|line_status | \------------/
|supplierID {FK} |
\--------------------/
| 1
|
|
| 1
/----------\
| Supplier |
|----------|
|ID {PK} |
\----------/
Querying the database directly, using DAO, with the following SQL gives me (almost) the desired result,
select count(ol.ID) as num_bookings,
day(from_unixtime(a.start)) as order_day,
ol.supplierID
from order_line ol left join
availability a on ol.availabilityID = a.ID
where ol.line_status = "booked"
and a.start >= 1451952000 //magic number for midnight today
and a.start <= 1452556800 //magic number for seven days from now
group by order_day, ol.supplierID;
something along the lines of
------------------------------------
| num_bookings|order_day|supplierID|
------------------------------------
| 1 | 5 | 3 |
| 2 | 5 | 7 |
| 1 | 6 | 7 |
| 1 | 7 | 7 |
------------------------------------
So there should be entries of 0 for the days the given Supplier has no bookings, like so
------------------------------------
| num_bookings|order_day|supplierID|
------------------------------------
| 1 | 5 | 3 |
| 0 | 6 | 3 |
| 0 | 7 | 3 |
| 2 | 5 | 7 |
| 1 | 6 | 7 |
| 1 | 7 | 7 |
------------------------------------
[days 8+ omitted for brevity...]
I've got some php/Yii code which will [eventually] give me something similar but involves multiple queries and database connections as follows,
$suppliers = Supplier::find()->all(); // get all suppliers
$start = strtotime('tomorrow');
$end = strtotime('+7 days', $start); // init times
// create empty assoc array with key for each of next 7 days
$booking_counts[date('D j', $start)] = 0;
for ($i=1; $i<7; ++$i) {
$next = strtotime('+'.$i." days", $start);
$booking_counts[date('D j', $next)] = 0;
}
foreach ($suppliers as $supplier) {
$bookings = OrderLine::find()
->joinWith('availability')
->where(['order_line.supplierID' => $supplier->ID])
->andWhere(['>=', 'availability.start', $start])
->andWhere(['<=', 'availability.start', $end])
->andWhere(['order_line.line_status' => 'booked'])
->orderBy(['availability.start' => SORT_ASC])
->all();
$booking_count = $booking_counts;
foreach ($bookings as $booking) {
$booking_count[date('D j', $booking->availability->start)] += 1;
}
}
This gives me an array for each supplier with the count stored under the appropriate day's index but that feels quite inefficient.
Can I refactor this code to return the desired data with fewer database calls and less 'scaffold' code?

Answer 1

This could be is the trasposition of your firt select
$results = OrderLine::find()
->select('count(order_line.ID) as num_bookings, day(from_unixtime(availability.start)) as order_day', order_line.supplierID )
->from('order_line')
->leftjoin('availability', 'order_line.availabilityID = availability.ID')
->where( 'order_line.line_status = "booked"
and a.start >= 1451952000
and a.start <= 1452556800')
->groupBy(order_day, order_line.supplierID)
->orderBy(['availability.start' => SORT_ASC])
->all();
in this way you should obtain a row for supplierID (and order_day) avoinding the foreach on supplier
For getting the data in $results->num_bookings and order_day you need add
public $num_bookings;
public $order_day;
in your OrderLine model
I hope this is what you are looking for.