149 lines
5.2 KiB
Python
149 lines
5.2 KiB
Python
from django.db import models
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from django.core.validators import MinValueValidator
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from django.utils.translation import gettext_lazy as _
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from decimal import Decimal
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from inventory.models import Supplier
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# Supplier model removed - using inventory.models.Supplier instead
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class PurchaseOrder(models.Model):
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"""Purchase order model"""
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ORDER_STATUS = [
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('draft', 'Draft'),
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('sent', 'Sent to Supplier'),
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('confirmed', 'Confirmed by Supplier'),
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('received', 'Received'),
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('cancelled', 'Cancelled'),
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]
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order_number = models.CharField(max_length=50, unique=True, help_text='Unique purchase order number')
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supplier = models.ForeignKey('inventory.Supplier', on_delete=models.CASCADE, related_name='purchase_orders')
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date = models.DateField()
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expected_delivery_date = models.DateField(blank=True, null=True)
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status = models.CharField(max_length=20, choices=ORDER_STATUS, default='draft')
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# Financial information
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subtotal = models.DecimalField(
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max_digits=12,
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decimal_places=2,
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default=0,
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validators=[MinValueValidator(Decimal('0'))]
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)
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tax_amount = models.DecimalField(
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max_digits=12,
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decimal_places=2,
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default=0,
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validators=[MinValueValidator(Decimal('0'))]
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)
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shipping_cost = models.DecimalField(
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max_digits=12,
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decimal_places=2,
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default=0,
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validators=[MinValueValidator(Decimal('0'))]
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)
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total_amount = models.DecimalField(
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max_digits=12,
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decimal_places=2,
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default=0,
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validators=[MinValueValidator(Decimal('0'))]
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)
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# Additional information
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notes = models.TextField(blank=True)
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terms_conditions = models.TextField(blank=True)
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# User tracking
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created_by = models.ForeignKey('users.CustomUser', on_delete=models.SET_NULL, null=True)
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created_at = models.DateTimeField(auto_now_add=True)
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updated_at = models.DateTimeField(auto_now=True)
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class Meta:
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ordering = ['-date', '-created_at']
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verbose_name = _('Purchase Order')
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verbose_name_plural = _('Purchase Orders')
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def __str__(self):
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return f"PO-{self.order_number} - {self.supplier.name}"
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def save(self, *args, **kwargs):
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"""Override save to calculate total amount"""
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self.total_amount = self.subtotal + self.tax_amount + self.shipping_cost
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super().save(*args, **kwargs)
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def get_item_count(self):
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"""Get total number of items in this purchase order"""
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return self.items.count()
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def is_overdue(self):
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"""Check if delivery is overdue"""
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if self.expected_delivery_date and self.status not in ['received', 'cancelled']:
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from django.utils import timezone
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return timezone.now().date() > self.expected_delivery_date
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return False
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class PurchaseOrderItem(models.Model):
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"""Individual items in purchase orders"""
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purchase_order = models.ForeignKey(PurchaseOrder, on_delete=models.CASCADE, related_name='items')
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product = models.ForeignKey('inventory.Product', on_delete=models.CASCADE, related_name='purchase_order_items')
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quantity = models.DecimalField(
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max_digits=10,
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decimal_places=2,
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validators=[MinValueValidator(Decimal('0.01'))]
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)
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unit_price = models.DecimalField(
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max_digits=10,
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decimal_places=2,
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validators=[MinValueValidator(Decimal('0'))]
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)
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total_price = models.DecimalField(
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max_digits=12,
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decimal_places=2,
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validators=[MinValueValidator(Decimal('0'))]
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)
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# Additional information
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description = models.CharField(max_length=200, blank=True)
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notes = models.TextField(blank=True)
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class Meta:
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verbose_name = _('Purchase Order Item')
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verbose_name_plural = _('Purchase Order Items')
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def __str__(self):
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return f"{self.purchase_order.order_number} - {self.product.name} ({self.quantity})"
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def save(self, *args, **kwargs):
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"""Override save to calculate total price"""
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self.total_price = self.quantity * self.unit_price
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super().save(*args, **kwargs)
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# Update purchase order subtotal
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self.purchase_order.subtotal = self.purchase_order.items.aggregate(
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total=models.Sum('total_price')
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)['total'] or Decimal('0')
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self.purchase_order.save()
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class PurchaseReceipt(models.Model):
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"""Receipt for received purchase orders"""
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receipt_number = models.CharField(max_length=50, unique=True)
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purchase_order = models.ForeignKey(PurchaseOrder, on_delete=models.CASCADE, related_name='receipts')
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receipt_date = models.DateField()
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# Receipt details
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notes = models.TextField(blank=True)
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received_by = models.ForeignKey('users.CustomUser', on_delete=models.SET_NULL, null=True)
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# Timestamps
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created_at = models.DateTimeField(auto_now_add=True)
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class Meta:
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ordering = ['-receipt_date']
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verbose_name = _('Purchase Receipt')
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verbose_name_plural = _('Purchase Receipts')
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def __str__(self):
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return f"Receipt-{self.receipt_number} for PO-{self.purchase_order.order_number}"
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