class PurchaseOrder(Order):
""" A PurchaseOrder represents goods shipped inwards from an external supplier.
Attributes:
supplier: Reference to the company supplying the goods in the order
supplier_reference: Optional field for supplier order reference code
received_by: User that received the goods
target_date: Expected delivery target date for PurchaseOrder completion (optional)
"""
OVERDUE_FILTER = Q(status__in=PurchaseOrderStatus.OPEN) & ~Q(target_date=None) & Q(target_date__lte=datetime.now().date())
@staticmethod
def filterByDate(queryset, min_date, max_date):
"""
Filter by 'minimum and maximum date range'
- Specified as min_date, max_date
- Both must be specified for filter to be applied
- Determine which "interesting" orders exist bewteen these dates
To be "interesting":
- A "received" order where the received date lies within the date range
- A "pending" order where the target date lies within the date range
- TODO: An "overdue" order where the target date is in the past
"""
date_fmt = '%Y-%m-%d' # ISO format date string
# Ensure that both dates are valid
try:
min_date = datetime.strptime(str(min_date), date_fmt).date()
max_date = datetime.strptime(str(max_date), date_fmt).date()
except (ValueError, TypeError):
# Date processing error, return queryset unchanged
return queryset
# Construct a queryset for "received" orders within the range
received = Q(status=PurchaseOrderStatus.COMPLETE) & Q(complete_date__gte=min_date) & Q(complete_date__lte=max_date)
# Construct a queryset for "pending" orders within the range
pending = Q(status__in=PurchaseOrderStatus.OPEN) & ~Q(target_date=None) & Q(target_date__gte=min_date) & Q(target_date__lte=max_date)
# TODO - Construct a queryset for "overdue" orders within the range
queryset = queryset.filter(received | pending)
return queryset
def __str__(self):
prefix = getSetting('PURCHASEORDER_REFERENCE_PREFIX')
return f"{prefix}{self.reference} - {self.supplier.name}"
status = models.PositiveIntegerField(default=PurchaseOrderStatus.PENDING, choices=PurchaseOrderStatus.items(),
help_text=_('Purchase order status'))
supplier = models.ForeignKey(
Company, on_delete=models.CASCADE,
limit_choices_to={
'is_supplier': True,
},
related_name='purchase_orders',
verbose_name=_('Supplier'),
help_text=_('Company from which the items are being ordered')
)
supplier_reference = models.CharField(max_length=64, blank=True, verbose_name=_('Supplier Reference'), help_text=_("Supplier order reference code"))
received_by = models.ForeignKey(
User,
on_delete=models.SET_NULL,
blank=True, null=True,
related_name='+',
verbose_name=_('received by')
)
issue_date = models.DateField(
blank=True, null=True,
verbose_name=_('Issue Date'),
help_text=_('Date order was issued')
)
target_date = models.DateField(
blank=True, null=True,
verbose_name=_('Target Delivery Date'),
help_text=_('Expected date for order delivery. Order will be overdue after this date.'),
)
complete_date = models.DateField(
blank=True, null=True,
verbose_name=_('Completion Date'),
help_text=_('Date order was completed')
)
def get_absolute_url(self):
return reverse('po-detail', kwargs={'pk': self.id})
@transaction.atomic
def add_line_item(self, supplier_part, quantity, group=True, reference='', purchase_price=None):
""" Add a new line item to this purchase order.
This function will check that:
* The supplier part matches the supplier specified for this purchase order
* The quantity is greater than zero
Args:
supplier_part - The supplier_part to add
quantity - The number of items to add
group - If True, this new quantity will be added to an existing line item for the same supplier_part (if it exists)
"""
try:
quantity = int(quantity)
if quantity <= 0:
raise ValidationError({
'quantity': _("Quantity must be greater than zero")})
except ValueError:
raise ValidationError({'quantity': _("Invalid quantity provided")})
if not supplier_part.supplier == self.supplier:
raise ValidationError({'supplier': _("Part supplier must match PO supplier")})
if group:
# Check if there is already a matching line item (for this PO)
matches = self.lines.filter(part=supplier_part)
if matches.count() > 0:
line = matches.first()
# update quantity and price
quantity_new = line.quantity + quantity
line.quantity = quantity_new
supplier_price = supplier_part.get_price(quantity_new)
if line.purchase_price and supplier_price:
line.purchase_price = supplier_price / quantity_new
line.save()
return
line = PurchaseOrderLineItem(
order=self,
part=supplier_part,
quantity=quantity,
reference=reference,
purchase_price=purchase_price,
)
line.save()
@transaction.atomic
def place_order(self):
""" Marks the PurchaseOrder as PLACED. Order must be currently PENDING. """
if self.status == PurchaseOrderStatus.PENDING:
self.status = PurchaseOrderStatus.PLACED
self.issue_date = datetime.now().date()
self.save()
@transaction.atomic
def complete_order(self):
""" Marks the PurchaseOrder as COMPLETE. Order must be currently PLACED. """
if self.status == PurchaseOrderStatus.PLACED:
self.status = PurchaseOrderStatus.COMPLETE
self.complete_date = datetime.now().date()
self.save()
@property
def is_overdue(self):
"""
Returns True if this PurchaseOrder is "overdue"
Makes use of the OVERDUE_FILTER to avoid code duplication.
"""
query = PurchaseOrder.objects.filter(pk=self.pk)
query = query.filter(PurchaseOrder.OVERDUE_FILTER)
return query.exists()
def can_cancel(self):
"""
A PurchaseOrder can only be cancelled under the following circumstances:
"""
return self.status in [
PurchaseOrderStatus.PLACED,
PurchaseOrderStatus.PENDING
]
def cancel_order(self):
""" Marks the PurchaseOrder as CANCELLED. """
if self.can_cancel():
self.status = PurchaseOrderStatus.CANCELLED
self.save()
def pending_line_items(self):
""" Return a list of pending line items for this order.
Any line item where 'received' < 'quantity' will be returned.
"""
return self.lines.filter(quantity__gt=F('received'))
@property
def is_complete(self):
""" Return True if all line items have been received """
return self.pending_line_items().count() == 0
@transaction.atomic
def receive_line_item(self, line, location, quantity, user, status=StockStatus.OK, purchase_price=None, **kwargs):
""" Receive a line item (or partial line item) against this PO
"""
notes = kwargs.get('notes', '')
if not self.status == PurchaseOrderStatus.PLACED:
raise ValidationError({"status": _("Lines can only be received against an order marked as 'Placed'")})
try:
if not (quantity % 1 == 0):
raise ValidationError({"quantity": _("Quantity must be an integer")})
if quantity < 0:
raise ValidationError({"quantity": _("Quantity must be a positive number")})
quantity = int(quantity)
except (ValueError, TypeError):
raise ValidationError({"quantity": _("Invalid quantity provided")})
# Create a new stock item
if line.part and quantity > 0:
stock = stock_models.StockItem(
part=line.part.part,
supplier_part=line.part,
location=location,
quantity=quantity,
purchase_order=self,
status=status,
purchase_price=purchase_price,
)
stock.save(add_note=False)
tracking_info = {
'status': status,
'purchaseorder': self.pk,
}
stock.add_tracking_entry(
StockHistoryCode.RECEIVED_AGAINST_PURCHASE_ORDER,
user,
notes=notes,
deltas=tracking_info,
location=location,
purchaseorder=self,
quantity=quantity
)
# Update the number of parts received against the particular line item
line.received += quantity
line.save()
# Has this order been completed?
if len(self.pending_line_items()) == 0:
self.received_by = user
self.complete_order() # This will save the model
class PurchaseOrder(Order):
""" A PurchaseOrder represents goods shipped inwards from an external supplier.
Attributes:
supplier: Reference to the company supplying the goods in the order
supplier_reference: Optional field for supplier order reference code
received_by: User that received the goods
"""
ORDER_PREFIX = "PO"
def __str__(self):
return "PO {ref} - {company}".format(ref=self.reference, company=self.supplier.name)
status = models.PositiveIntegerField(default=PurchaseOrderStatus.PENDING, choices=PurchaseOrderStatus.items(),
help_text='Purchase order status')
supplier = models.ForeignKey(
Company, on_delete=models.CASCADE,
limit_choices_to={
'is_supplier': True,
},
related_name='purchase_orders',
help_text=_('Supplier')
)
supplier_reference = models.CharField(max_length=64, blank=True, help_text=_("Supplier order reference code"))
received_by = models.ForeignKey(
User,
on_delete=models.SET_NULL,
blank=True, null=True,
related_name='+'
)
issue_date = models.DateField(blank=True, null=True)
complete_date = models.DateField(blank=True, null=True)
def get_absolute_url(self):
return reverse('po-detail', kwargs={'pk': self.id})
@transaction.atomic
def add_line_item(self, supplier_part, quantity, group=True, reference=''):
""" Add a new line item to this purchase order.
This function will check that:
* The supplier part matches the supplier specified for this purchase order
* The quantity is greater than zero
Args:
supplier_part - The supplier_part to add
quantity - The number of items to add
group - If True, this new quantity will be added to an existing line item for the same supplier_part (if it exists)
"""
try:
quantity = int(quantity)
if quantity <= 0:
raise ValidationError({
'quantity': _("Quantity must be greater than zero")})
except ValueError:
raise ValidationError({'quantity': _("Invalid quantity provided")})
if not supplier_part.supplier == self.supplier:
raise ValidationError({'supplier': _("Part supplier must match PO supplier")})
if group:
# Check if there is already a matching line item (for this PO)
matches = self.lines.filter(part=supplier_part)
if matches.count() > 0:
line = matches.first()
line.quantity += quantity
line.save()
return
line = PurchaseOrderLineItem(
order=self,
part=supplier_part,
quantity=quantity,
reference=reference)
line.save()
def place_order(self):
""" Marks the PurchaseOrder as PLACED. Order must be currently PENDING. """
if self.status == PurchaseOrderStatus.PENDING:
self.status = PurchaseOrderStatus.PLACED
self.issue_date = datetime.now().date()
self.save()
def complete_order(self):
""" Marks the PurchaseOrder as COMPLETE. Order must be currently PLACED. """
if self.status == PurchaseOrderStatus.PLACED:
self.status = PurchaseOrderStatus.COMPLETE
self.complete_date = datetime.now().date()
self.save()
def cancel_order(self):
""" Marks the PurchaseOrder as CANCELLED. """
if self.status in [PurchaseOrderStatus.PLACED, PurchaseOrderStatus.PENDING]:
self.status = PurchaseOrderStatus.CANCELLED
self.save()
def pending_line_items(self):
""" Return a list of pending line items for this order.
Any line item where 'received' < 'quantity' will be returned.
"""
return self.lines.filter(quantity__gt=F('received'))
@property
def is_complete(self):
""" Return True if all line items have been received """
return self.pending_line_items().count() == 0
@transaction.atomic
def receive_line_item(self, line, location, quantity, user, status=StockStatus.OK):
""" Receive a line item (or partial line item) against this PO
"""
if not self.status == PurchaseOrderStatus.PLACED:
raise ValidationError({"status": _("Lines can only be received against an order marked as 'Placed'")})
try:
quantity = int(quantity)
if quantity <= 0:
raise ValidationError({"quantity": _("Quantity must be greater than zero")})
except ValueError:
raise ValidationError({"quantity": _("Invalid quantity provided")})
# Create a new stock item
if line.part:
stock = stock_models.StockItem(
part=line.part.part,
supplier_part=line.part,
location=location,
quantity=quantity,
purchase_order=self,
status=status
)
stock.save()
# Add a new transaction note to the newly created stock item
stock.addTransactionNote("Received items", user, "Received {q} items against order '{po}'".format(
q=quantity,
po=str(self))
)
# Update the number of parts received against the particular line item
line.received += quantity
line.save()
# Has this order been completed?
if len(self.pending_line_items()) == 0:
self.received_by = user
self.complete_order() # This will save the model