施肥散布実績機能を実装し運搬・作業記録・在庫連携を追加

backend/apps/fertilizer/models.py

@@ -69,6 +69,13 @@ class FertilizationEntry(models.Model):
         Fertilizer, on_delete=models.PROTECT, verbose_name='肥料'
     )
     bags = models.DecimalField(max_digits=8, decimal_places=2, verbose_name='袋数')
+    actual_bags = models.DecimalField(
+        max_digits=10,
+        decimal_places=4,
+        null=True,
+        blank=True,
+        verbose_name='実績袋数',
+    )
 
     class Meta:
         verbose_name = '施肥エントリ'
@@ -179,3 +186,63 @@ class DeliveryTripItem(models.Model):
 
     def __str__(self):
         return f"{self.trip} / {self.field.name} / {self.fertilizer.name}: {self.bags}袋"
+
+
+class SpreadingSession(models.Model):
+    """散布日単位の実績"""
+    year = models.IntegerField(verbose_name='年度')
+    date = models.DateField(verbose_name='散布日')
+    name = models.CharField(max_length=100, blank=True, verbose_name='名前')
+    notes = models.TextField(blank=True, default='', verbose_name='備考')
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        verbose_name = '散布実績'
+        verbose_name_plural = '散布実績'
+        ordering = ['-date', '-id']
+
+    def __str__(self):
+        label = self.name.strip() or f'{self.date}'
+        return f'{self.year} {label}'
+
+
+class SpreadingSessionItem(models.Model):
+    """散布実績明細：圃場×肥料ごとの実績"""
+    session = models.ForeignKey(
+        SpreadingSession,
+        on_delete=models.CASCADE,
+        related_name='items',
+        verbose_name='散布実績',
+    )
+    field = models.ForeignKey(
+        'fields.Field', on_delete=models.PROTECT, verbose_name='圃場'
+    )
+    fertilizer = models.ForeignKey(
+        Fertilizer, on_delete=models.PROTECT, verbose_name='肥料'
+    )
+    actual_bags = models.DecimalField(max_digits=10, decimal_places=4, verbose_name='実散布袋数')
+    planned_bags_snapshot = models.DecimalField(
+        max_digits=10,
+        decimal_places=4,
+        verbose_name='計画袋数スナップショット',
+    )
+    delivered_bags_snapshot = models.DecimalField(
+        max_digits=10,
+        decimal_places=4,
+        verbose_name='運搬済み袋数スナップショット',
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        verbose_name = '散布実績明細'
+        verbose_name_plural = '散布実績明細'
+        unique_together = [['session', 'field', 'fertilizer']]
+        ordering = ['field__display_order', 'field__id', 'fertilizer__name']
+
+    def __str__(self):
+        return (
+            f'{self.session} / {self.field.name} / '
+            f'{self.fertilizer.name}: {self.actual_bags}袋'
+        )