#This file is part of Tryton. The COPYRIGHT file at the top level of #this repository contains the full copyright notices and license terms. import datetime import operator from itertools import groupby from functools import partial from decimal import Decimal from trytond.model import ModelView, ModelSQL, fields from trytond.wizard import Wizard, StateView, StateAction, StateTransition, \ Button from trytond.pyson import If, In, Eval, Get from trytond.transaction import Transaction from trytond.pool import Pool class PurchaseRequest(ModelSQL, ModelView): 'Purchase Request' _name = 'purchase.request' _description = __doc__ product = fields.Many2One('product.product', 'Product', required=True, select=True, readonly=True, domain=[('purchasable', '=', True)]) party = fields.Many2One('party.party', 'Party', select=True) quantity = fields.Float('Quantity', required=True) uom = fields.Many2One('product.uom', 'UOM', required=True, select=True) computed_quantity = fields.Float('Computed Quantity', readonly=True) computed_uom = fields.Many2One('product.uom', 'Computed UOM', readonly=True) purchase_date = fields.Date('Best Purchase Date', readonly=True) supply_date = fields.Date('Expected Supply Date', readonly=True) stock_level = fields.Float('Stock at Supply Date', readonly=True) warehouse = fields.Many2One( 'stock.location', "Warehouse", states={ 'required': Eval('warehouse_required', False), }, domain=[('type', '=', 'warehouse')], depends=['warehouse_required'], readonly=True) warehouse_required = fields.Function(fields.Boolean('Warehouse Required'), 'get_warehouse_required') purchase_line = fields.Many2One('purchase.line', 'Purchase Line', readonly=True) purchase = fields.Function(fields.Many2One('purchase.purchase', 'Purchase'), 'get_purchase') company = fields.Many2One('company.company', 'Company', required=True, readonly=True, domain=[ ('id', If(In('company', Eval('context', {})), '=', '!='), Get(Eval('context', {}), 'company', 0)), ]) origin = fields.Reference('Origin', selection='origin_get', readonly=True, required=True) state = fields.Function(fields.Selection([ ('purchased', 'Purchased'), ('done', 'Done'), ('draft', 'Draft'), ('cancel', 'Cancel'), ], 'State'), 'get_state') def __init__(self): super(PurchaseRequest, self).__init__() self._order[0] = ('id', 'DESC') self._error_messages.update({ 'create_request': 'Purchase requests are only created ' \ 'by the system.', }) self._sql_constraints += [ ('check_purchase_request_quantity', 'CHECK(quantity > 0)', 'The requested quantity must be greater than 0'), ] def init(self, module_name): cursor = Transaction().cursor super(PurchaseRequest, self).init(module_name) # Migration from 2.0: empty order point origin is -1 instead of 0 cursor.execute('UPDATE "%s" ' 'SET origin = %%s WHERE origin = %%s' % self._table, ('stock.order_point,-1', 'stock.order_point,0')) def get_rec_name(self, ids, name): if isinstance(ids, (int, long)): ids = [ids] res = {} for pr in self.browse(ids): if pr.warehouse: res[pr.id] = "%s@%s" % (pr.product.name, pr.warehouse.name) else: res[pr.id] = pr.product.name return res def search_rec_name(self, name, clause): res = [] names = clause[2].split('@', 1) res.append(('product.template.name', clause[1], names[0])) if len(names) != 1 and names[1]: res.append(('warehouse', clause[1], names[1])) return res def default_company(self): return Transaction().context.get('company') def get_purchase(self, ids, name): res = {} requests = self.browse(ids) for request in requests: if request.purchase_line: res[request.id] = request.purchase_line.purchase.id else: res[request.id] = None return res def get_state(self, ids, name): res = {}.fromkeys(ids, 'draft') for request in self.browse(ids): if request.purchase_line: if request.purchase_line.purchase.state == 'cancel': res[request.id] = 'cancel' elif request.purchase_line.purchase.state == 'done': res[request.id] = 'done' else: res[request.id] = 'purchased' return res def get_warehouse_required(self, ids, name): requireds = {} for request in self.browse(ids): requireds[request.id] = request.product.type in ('goods', 'assets') return requireds def origin_get(self): model_obj = Pool().get('ir.model') res = [] model_ids = model_obj.search([ ('model', '=', 'stock.order_point'), ]) for model in model_obj.browse(model_ids): res.append([model.model, model.name]) return res def generate_requests(self): """ For each product compute the purchase request that must be create today to meet product outputs. """ pool = Pool() order_point_obj = pool.get('stock.order_point') product_obj = pool.get('product.product') location_obj = pool.get('stock.location') user_obj = pool.get('res.user') company = user_obj.browse(Transaction().user).company # fetch warehouses: warehouse_ids = location_obj.search([ ('type', '=', 'warehouse'), ]) # fetch order points order_point_ids = order_point_obj.search([ ('type', '=', 'purchase'), ]) # index them by product product2ops = {} for order_point in order_point_obj.browse(order_point_ids): product2ops[ (order_point.warehouse_location.id, order_point.product.id) ] = order_point # fetch goods product_ids = product_obj.search([ ('type', '=', 'goods'), ('consumable', '=', False), ('purchasable', '=', True), ]) #aggregate product by minimum supply date date2products = {} for product in product_obj.browse(product_ids): min_date, max_date = self.get_supply_dates(product) date2products.setdefault((min_date, max_date), []).append(product) # compute requests new_requests = [] cursor = Transaction().cursor for dates, products in date2products.iteritems(): min_date, max_date = dates for i in range(0, len(products), cursor.IN_MAX): product_ids = [p.id for p in products[i:i + cursor.IN_MAX]] with Transaction().set_context(forecast=True, stock_date_end=min_date or datetime.date.max): pbl = product_obj.products_by_location(warehouse_ids, product_ids, with_childs=True, skip_zero=False) for warehouse_id in warehouse_ids: min_date_qties = dict((x, pbl.pop((warehouse_id, x))) for x in product_ids) # Search for shortage between min-max shortages = self.get_shortage(warehouse_id, product_ids, min_date, max_date, min_date_qties=min_date_qties, order_points=product2ops) for product in products[i:i + cursor.IN_MAX]: shortage_date, product_quantity = shortages[product.id] if shortage_date == None or product_quantity == None: continue order_point = product2ops.get( (warehouse_id, product.id)) # generate request values request_val = self.compute_request(product, warehouse_id, shortage_date, product_quantity, company, order_point) new_requests.append(request_val) new_requests = self.compare_requests(new_requests) self.create_requests(new_requests) return {} def create_requests(self, new_requests): request_obj = Pool().get('purchase.request') for new_req in new_requests: if new_req['supply_date'] == datetime.date.max: new_req['supply_date'] = None if new_req['quantity'] > 0.0: new_req.update({ 'product': new_req['product'].id, 'party': new_req['party'] and new_req['party'].id, 'uom': new_req['uom'].id, 'computed_uom': new_req['computed_uom'].id, 'company': new_req['company'].id }) request_obj.create(new_req) def compare_requests(self, new_requests): """ Compare new_requests with already existing request to avoid to re-create existing requests. """ # delete purchase request without a purchase line pool = Pool() uom_obj = pool.get('product.uom') request_obj = pool.get('purchase.request') req_ids = request_obj.search([ ('purchase_line', '=', None), ('origin', 'like', 'stock.order_point,%'), ]) request_obj.delete(req_ids) req_ids = request_obj.search([ ('purchase_line.moves', '=', None), ('purchase_line.purchase.state', '!=', 'cancel'), ('origin', 'like', 'stock.order_point,%'), ]) requests = request_obj.browse(req_ids) # Fetch data from existing requests existing_req = {} for request in requests: pline = request.purchase_line # Skip incoherent request if request.product.id != pline.product.id or \ request.warehouse.id != pline.purchase.warehouse.id: continue # Take smallest amount between request and purchase line req_qty = uom_obj.compute_qty(request.uom, request.quantity, pline.unit) if req_qty < pline.quantity: quantity = request.quantity uom = request.uom else: quantity = pline.quantity uom = pline.unit existing_req.setdefault( (request.product.id, request.warehouse.id), []).append({ 'supply_date': \ request.supply_date or datetime.date.max, 'quantity': quantity, 'uom': uom, }) for i in existing_req.itervalues(): i.sort(lambda r, s: cmp(r['supply_date'], s['supply_date'])) # Update new requests to take existing requests into account new_requests.sort(key=operator.itemgetter('supply_date')) for new_req in new_requests: for old_req in existing_req.get((new_req['product'].id, new_req['warehouse']), []): if old_req['supply_date'] <= new_req['supply_date']: quantity = uom_obj.compute_qty(old_req['uom'], old_req['quantity'], new_req['uom']) new_req['quantity'] = max(0.0, new_req['quantity'] - quantity) new_req['computed_quantity'] = new_req['quantity'] old_req['quantity'] = uom_obj.compute_qty(new_req['uom'], max(0.0, quantity - new_req['quantity']), old_req['uom']) else: break return new_requests def get_supply_dates(self, product): """ Return the minimal interval of earliest supply dates for a product. :param product: a BrowseRecord of the Product :return: a tuple with the two dates """ product_supplier_obj = Pool().get('purchase.product_supplier') date_obj = Pool().get('ir.date') min_date = None max_date = None today = date_obj.today() for product_supplier in product.product_suppliers: supply_date = product_supplier_obj.compute_supply_date( product_supplier, date=today) # TODO next_day is by default today + 1 but should depends # on the CRON activity next_day = today + datetime.timedelta(1) next_supply_date = product_supplier_obj.compute_supply_date( product_supplier, date=next_day) if (not min_date) or supply_date < min_date: min_date = supply_date if (not max_date): max_date = next_supply_date if supply_date > min_date and supply_date < max_date: max_date = supply_date if next_supply_date < max_date: max_date = next_supply_date if not min_date: min_date = datetime.date.max max_date = datetime.date.max return (min_date, max_date) def find_best_supplier(self, product, date): ''' Return the best supplier and purchase_date for the product. ''' pool = Pool() date_obj = pool.get('ir.date') product_supplier_obj = pool.get('purchase.product_supplier') supplier = None timedelta = datetime.timedelta.max today = date_obj.today() for product_supplier in product.product_suppliers: supply_date = product_supplier_obj.compute_supply_date( product_supplier, date=today) sup_timedelta = date - supply_date if not supplier: supplier = product_supplier.party timedelta = sup_timedelta continue if timedelta < datetime.timedelta(0) \ and (sup_timedelta >= datetime.timedelta(0) \ or sup_timedelta > timedelta): supplier = product_supplier.party timedelta = sup_timedelta if supplier: purchase_date = product_supplier_obj.compute_purchase_date( product_supplier, date) else: purchase_date = today return supplier, purchase_date def compute_request(self, product, location_id, shortage_date, product_quantity, company, order_point=None): """ Return the value of the purchase request which will answer to the needed quantity at the given date. I.e: the latest purchase date, the expected supply date and the prefered supplier. """ pool = Pool() uom_obj = pool.get('product.uom') supplier, purchase_date = self.find_best_supplier(product, shortage_date) max_quantity = order_point and order_point.max_quantity or 0.0 quantity = uom_obj.compute_qty(product.default_uom, max_quantity - product_quantity, product.purchase_uom or product.default_uom) if order_point: origin = 'stock.order_point,%s' % order_point.id else: origin = 'stock.order_point,-1' return {'product': product, 'party': supplier and supplier or None, 'quantity': quantity, 'uom': product.purchase_uom or product.default_uom, 'computed_quantity': quantity, 'computed_uom': product.purchase_uom or product.default_uom, 'purchase_date': purchase_date, 'supply_date': shortage_date, 'stock_level': product_quantity, 'company': company, 'warehouse': location_id, 'origin': origin, } def get_shortage(self, location_id, product_ids, min_date, max_date, min_date_qties, order_points): """ Return for each product the first date between min_date and max_date where the stock quantity is less than the minimal quantity and the smallest stock quantity in the interval or None if there is no date where stock quantity is less than the minimal quantity. The minimal quantity comes from the order point or is zero. min_date_qty is the quantities for each products at the min_date. order_points is a dictionary that links products to order point. """ product_obj = Pool().get('product.product') res_dates = {} res_qties = {} min_quantities = {} for product_id in product_ids: order_point = order_points.get((location_id, product_id)) if order_point: min_quantities[product_id] = order_point.min_quantity else: min_quantities[product_id] = 0.0 current_date = min_date current_qties = min_date_qties.copy() while (current_date < max_date) or (current_date == min_date): for product_id in product_ids: current_qty = current_qties[product_id] min_quantity = min_quantities[product_id] res_qty = res_qties.get(product_id) res_date = res_dates.get(product_id) if current_qty < min_quantity: if not res_date: res_dates[product_id] = current_date if (not res_qty) or (current_qty < res_qty): res_qties[product_id] = current_qty with Transaction().set_context(stock_date_start=current_date, stock_date_end=current_date): pbl = product_obj.products_by_location([location_id], product_ids, with_childs=True, skip_zero=False) for key, qty in pbl.iteritems(): _, product_id = key current_qties[product_id] += qty if current_date == datetime.date.max: break current_date += datetime.timedelta(1) return dict((x, (res_dates.get(x), res_qties.get(x))) for x in product_ids) def create(self, vals): for field_name in ('product', 'quantity', 'uom', 'company'): if not vals.get(field_name): self.raise_user_error('create_request') return super(PurchaseRequest, self).create(vals) PurchaseRequest() class CreatePurchaseRequestStart(ModelView): 'Create Purchase Request' _name = 'purchase.request.create.start' _description = __doc__ CreatePurchaseRequestStart() class CreatePurchaseRequest(Wizard): 'Create Purchase Request' _name = 'purchase.request.create' start = StateView('purchase.request.create.start', 'stock_supply.purchase_request_create_start_view_form', [ Button('Cancel', 'end', 'tryton-cancel'), Button('Create', 'create_', 'tryton-ok', default=True), ]) create_ = StateAction('stock_supply.act_purchase_request_form_draft') def do_create_(self, session, action): purchase_request_obj = Pool().get('purchase.request') purchase_request_obj.generate_requests() return action, {} def transition_create_(self, session): return 'end' CreatePurchaseRequest() class CreatePurchaseAskTerm(ModelView): 'Create Purchase Ask Term' _name = 'purchase.request.create_purchase.ask_term' _description = __doc__ party = fields.Many2One('party.party', 'Supplier', readonly=True) company = fields.Many2One('company.company', 'Company', readonly=True) payment_term = fields.Many2One( 'account.invoice.payment_term', 'Payment Term', required=True) CreatePurchaseAskTerm() class CreatePurchaseAskParty(ModelView): 'Create Purchase Ask Party' _name = 'purchase.request.create_purchase.ask_party' _description = __doc__ product = fields.Many2One('product.product', 'Product', readonly=True) company = fields.Many2One('company.company', 'Company', readonly=True) party = fields.Many2One('party.party', 'Supplier', required=True) CreatePurchaseAskParty() class CreatePurchase(Wizard): 'Create Purchase' _name = 'purchase.request.create_purchase' start = StateTransition() ask_party = StateView('purchase.request.create_purchase.ask_party', 'stock_supply.purchase_request_create_purchase_ask_party', [ Button('Cancel', 'end', 'tryton-cancel'), Button('Continue', 'start', 'tryton-go-next', default=True), ]) ask_term = StateView('purchase.request.create_purchase.ask_term', 'stock_supply.purchase_request_create_purchase_ask_term_view_form', [ Button('Cancel', 'end', 'tryton-cancel'), Button('Continue', 'start', 'tryton-go-next', default=True), ]) def __init__(self): super(CreatePurchase, self).__init__() self._error_messages.update({ 'missing_price': 'Purchase price is missing for product: %s ' \ '(id: %s)!', 'please_update': 'This price is necessary for creating purchase.' }) def default_ask_party(self, session, fields): request_obj = Pool().get('purchase.request') requests = request_obj.browse(Transaction().context['active_ids']) for request in requests: if request.purchase_line: continue if not request.party: return { 'product': request.product.id, 'company': request.company.id, } return { 'product': request.product.id, 'company': request.company.id, } def default_ask_term(self, session, fields): request_obj = Pool().get('purchase.request') requests = request_obj.browse(Transaction().context['active_ids']) for request in requests: if (not request.party) or request.purchase_line: continue if not request.party.supplier_payment_term: return { 'party': request.party.id, 'company': request.company.id, } return { 'party': request.party.id, 'company': request.company.id, } def _group_purchase_key(self, requests, request): ''' The key to group lines by purchases :param requests: a list of requests :param request: the request :return: a list of key-value as tuples of the purchase ''' party_obj = Pool().get('party.party') return ( ('company', request.company.id), ('party', request.party.id), ('payment_term', request.party.supplier_payment_term.id), ('warehouse', request.warehouse.id), # XXX use function field ('currency', request.company.currency.id), ('invoice_address', party_obj.address_get(request.party.id, type='invoice')), ) def transition_start(self, session): pool = Pool() request_obj = pool.get('purchase.request') party_obj = pool.get('party.party') purchase_obj = pool.get('purchase.purchase') line_obj = pool.get('purchase.line') date_obj = pool.get('ir.date') request_ids = Transaction().context['active_ids'] if (session.ask_party.product and session.ask_party.party and session.ask_party.company): req_ids = request_obj.search([ ('id', 'in', request_ids), ('party', '=', None), ]) if req_ids: request_obj.write(req_ids, { 'party': session.ask_party.party.id, }) session.ask_party.product = None session.ask_party.party = None session.ask_party.company = None elif (session.ask_term.payment_term and session.ask_term.party and session.ask_term.company): with Transaction().set_context( company=session.ask_term.company.id): party_obj.write(session.ask_term.party.id, { 'supplier_payment_term': \ session.ask_term.payment_term.id, }) session.ask_term.payment_term = None session.ask_term.party = None session.ask_term.company = None req_ids = request_obj.search([ ('id', 'in', request_ids), ('purchase_line', '=', None), ('party', '=', None), ]) if req_ids: return 'ask_party' today = date_obj.today() requests = request_obj.browse(request_ids) requests = [r for r in requests if not r.purchase_line] if any(r for r in requests if not r.party.supplier_payment_term): return 'ask_term' keyfunc = partial(self._group_purchase_key, requests) requests = sorted(requests, key=keyfunc) with Transaction().set_user(0, set_context=True): for key, grouped_requests in groupby(requests, key=keyfunc): grouped_requests = list(grouped_requests) try: purchase_date = min(r.purchase_date for r in grouped_requests if r.purchase_date) except ValueError: purchase_date = today if purchase_date < today: purchase_date = today values = { 'purchase_date': purchase_date, } values.update(dict(key)) purchase_id = purchase_obj.create(values) for request in grouped_requests: values = self.compute_purchase_line(request) values['purchase'] = purchase_id line_id = line_obj.create(values) request_obj.write(request.id, { 'purchase_line': line_id, }) return 'end' def _get_tax_rule_pattern(self, request): ''' Get tax rule pattern :param request: the BrowseRecord of the purchase request :return: a dictionary to use as pattern for tax rule ''' res = {} return res def compute_purchase_line(self, request): pool = Pool() product_obj = pool.get('product.product') tax_rule_obj = pool.get('account.tax.rule') line_obj = pool.get('purchase.line') line = { 'product': request.product.id, 'unit': request.uom.id, 'quantity': request.quantity, 'description': request.product.name, } # XXX purchase with several lines of the same product with Transaction().set_context(uom=request.uom.id, supplier=request.party.id, currency=request.company.currency.id): product_price = product_obj.get_purchase_price( [request.product.id], request.quantity)[request.product.id] product_price = product_price.quantize( Decimal(1) / 10 ** line_obj.unit_price.digits[1]) if not product_price: self.raise_user_error('missing_price', (request.product.name, request.product.id), 'please_update') line['unit_price'] = product_price taxes = [] for tax in request.product.supplier_taxes_used: if request.party and request.party.supplier_tax_rule: pattern = self._get_tax_rule_pattern(request) tax_ids = tax_rule_obj.apply(request.party.supplier_tax_rule, tax, pattern) if tax_ids: taxes.extend(tax_ids) continue taxes.append(tax.id) line['taxes'] = [('add', taxes)] return line CreatePurchase()