Added configurable date column

README.md

@@ -61,6 +61,46 @@ class MyProjectableModel extends Model
     ];
 }
 ```
+If you want to use a different date field from your Model instead of created_at then do the following :
+1) Make sure the field is casted to Carbon
+
+```php
+use App\Models\Projections\MyProjection;
+use TimothePearce\TimeSeries\Projectable;
+
+class MyProjectableModel extends Model
+{
+    use Projectable;
+
+    protected $casts = [
+        'other_date_time' => 'datetime:Y-m-d H:00',
+    ];
+
+    protected array $projections = [
+        MyProjection::class,
+    ];
+}
+```
+2) Add the dateColumn field in your Projection
+```php
+namespace App\Models\Projections;
+
+use Illuminate\Database\Eloquent\Model;
+use TimothePearce\TimeSeries\Contracts\ProjectionContract;
+use TimothePearce\TimeSeries\Models\Projection;
+
+class MyProjection extends Projection implements ProjectionContract
+{
+    /**
+     * The projected periods.
+     */
+    public array $periods = [];
+
+    public string $dateColumn = 'other_date_time';
+....
+
+```
+
 
 ### Implement a Projection
 

composer.json

@@ -26,6 +26,7 @@
         "php": "^8.0"
     },
     "require-dev": {
+        "brianium/paratest": "^6.11",
         "nunomaduro/collision": "^6.0",
         "nunomaduro/larastan": "^2.0.1",
         "orchestra/testbench": "^7.0",

src/Projector.php

@@ -9,11 +9,17 @@
 
 class Projector
 {
+    public string $dateColumn = 'created_at';
+
     public function __construct(
         protected Model  $projectedModel,
         protected string $projectionName,
         protected string $eventName,
     ) {
+        $projection = (new $this->projectionName());
+        if (isset($projection->dateColumn)) {
+            $this->dateColumn = $projection->dateColumn;
+        }
     }
 
     /**
@@ -104,7 +110,7 @@ private function findProjection(string $period): Projection|null
             ['projection_name', $this->projectionName],
             ['key', $this->hasKey() ? $this->key() : null],
             ['period', $period],
-            ['start_date', app(TimeSeries::class)->resolveFloorDate($this->projectedModel->created_at, $period)],
+            ['start_date', app(TimeSeries::class)->resolveFloorDate($this->projectedModel->{$this->dateColumn}, $period)],
         ]);
     }
 
@@ -117,7 +123,7 @@ private function createProjection(string $period): void
             'projection_name' => $this->projectionName,
             'key' => $this->hasKey() ? $this->key() : null,
             'period' => $period,
-            'start_date' => app(TimeSeries::class)->resolveFloorDate($this->projectedModel->created_at, $period),
+            'start_date' => app(TimeSeries::class)->resolveFloorDate($this->projectedModel->{$this->dateColumn}, $period),
             'content' => $this->mergeProjectedContent((new $this->projectionName())->defaultContent(), $period),
         ]);
     }
@@ -193,7 +199,7 @@ private function resolveCallableMethod(array $content, string $period): array
      */
     private function resolveStartDate(string $periodType, int $quantity): Carbon
     {
-        $startDate = $this->projectedModel->created_at->floorUnit($periodType, $quantity);
+        $startDate = $this->projectedModel->{$this->dateColumn}->floorUnit($periodType, $quantity);
 
         if (in_array($periodType, ['week', 'weeks'])) {
             $startDate->startOfWeek(config('time-series.beginning_of_the_week'));

tests/Models/Projections/TableReservationPerDiningDayProjection.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace TimothePearce\TimeSeries\Tests\Models\Projections;
+
+use Illuminate\Database\Eloquent\Model;
+use TimothePearce\TimeSeries\Contracts\ProjectionContract;
+use TimothePearce\TimeSeries\Models\Projection;
+
+class TableReservationPerDiningDayProjection extends Projection implements ProjectionContract
+{
+    /**
+     * Lists the time intervals used to compute the projections.
+     */
+    public array $periods = ['1 day'];
+
+    public string $dateColumn = 'reservation_date';
+
+    /**
+     * The default projection content.
+     */
+    public function defaultContent(): array
+    {
+        return [
+            'total_people' => 0,
+            'number_reservations' => 0,
+        ];
+    }
+
+    /**
+     * Computes the content when a projectable model is created.
+     */
+    public function projectableCreated(array $content, Model $model): array
+    {
+        return [
+            'total_people' => $content['total_people'] += $model->number_people,
+            'number_reservations' => $content['number_reservations'] + 1,
+        ];
+    }
+
+    /**
+     * Computes the content when a projectable model is deleted.
+     */
+    public function projectableDeleted(array $content, Model $model): array
+    {
+        return [
+            'total_people' => $content['total_people'] -= $model->number_people,
+            'number_reservations' => $content['number_reservations'] - 1,
+        ];
+    }
+}

tests/Models/Projections/TableReservationPerDiningDayProjectionWithKey.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace TimothePearce\TimeSeries\Tests\Models\Projections;
+
+use Illuminate\Database\Eloquent\Model;
+use TimothePearce\TimeSeries\Contracts\ProjectionContract;
+use TimothePearce\TimeSeries\Models\Projection;
+
+class TableReservationPerDiningDayProjectionWithKey extends TableReservationPerDiningDayProjection
+{
+    /**
+     * The key used to query the projection.
+     */
+    public static function key(Model $model): string
+    {
+        return (string)$model->table_id;
+    }
+}

tests/Models/Projections/TableReservationPerMadeDayProjection.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace TimothePearce\TimeSeries\Tests\Models\Projections;
+
+use Illuminate\Database\Eloquent\Model;
+use TimothePearce\TimeSeries\Contracts\ProjectionContract;
+use TimothePearce\TimeSeries\Models\Projection;
+
+class TableReservationPerMadeDayProjection extends TableReservationPerDiningDayProjection
+{
+    public function __construct() {
+        $this->dateColumn = 'reservation_made_date';
+    }
+}

tests/Models/TableReservation.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace TimothePearce\TimeSeries\Tests\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use TimothePearce\TimeSeries\Models\Traits\Projectable;
+use TimothePearce\TimeSeries\Tests\Models\Projections\TableReservationPerMadeDayProjection;
+use TimothePearce\TimeSeries\Tests\Models\Projections\TableReservationPerDiningDayProjection;
+
+class TableReservation extends Model
+{
+    use HasFactory;
+    use Projectable;
+    use SoftDeletes;
+
+    protected $casts = [
+        'reservation_date'      => 'datetime:Y-m-d',
+        'reservation_made_date' => 'datetime:Y-m-d H:00',
+    ];
+    /**
+     * The projections list.
+     */
+    protected array $projections = [
+        TableReservationPerMadeDayProjection::class,
+        TableReservationPerDiningDayProjection::class,
+    ];
+}