def patch(self):
        """Tender Edit (partial)

        For example here is how procuring entity can change number of items to be procured and total Value of a tender:

        .. sourcecode:: http

            PATCH /tenders/4879d3f8ee2443169b5fbbc9f89fa607 HTTP/1.1
            Host: example.com
            Accept: application/json

            {
                "data": {
                    "value": {
                        "amount": 600
                    },
                    "itemsToBeProcured": [
                        {
                            "quantity": 6
                        }
                    ]
                }
            }

        And here is the response to be expected:

        .. sourcecode:: http

            HTTP/1.0 200 OK
            Content-Type: application/json

            {
                "data": {
                    "id": "4879d3f8ee2443169b5fbbc9f89fa607",
                    "tenderID": "UA-64e93250be76435397e8c992ed4214d1",
                    "dateModified": "2014-10-27T08:12:34.956Z",
                    "value": {
                        "amount": 600
                    },
                    "itemsToBeProcured": [
                        {
                            "quantity": 6
                        }
                    ]
                }
            }

        """
        tender = self.context
        if self.request.authenticated_role != 'Administrator' and tender.status in [
                'complete', 'unsuccessful', 'cancelled'
        ]:
            self.request.errors.add(
                'body', 'data',
                'Can\'t update tender in current ({}) status'.format(
                    tender.status))
            self.request.errors.status = 403
            return
        data = self.request.validated['data']

        if self.request.authenticated_role == 'tender_owner' and self.request.validated[
                'tender_status'] == 'active.tendering':
            if 'tenderPeriod' in data and 'endDate' in data['tenderPeriod']:
                self.request.validated['tender'].tenderPeriod.import_data(
                    data['tenderPeriod'])
                if calculate_business_date(
                        get_now(), TENDERING_EXTRA_PERIOD, tender, True
                ) > self.request.validated['tender'].tenderPeriod.endDate:
                    self.request.errors.add(
                        'body', 'data',
                        'tenderPeriod should be extended by {0.days} working days'
                        .format(TENDERING_EXTRA_PERIOD))
                    self.request.errors.status = 403
                    return
                self.request.validated['tender'].initialize()
                self.request.validated['data'][
                    "enquiryPeriod"] = self.request.validated[
                        'tender'].enquiryPeriod.serialize()

        apply_patch(self.request,
                    save=False,
                    src=self.request.validated['tender_src'])
        if self.request.authenticated_role == 'chronograph':
            check_status(self.request)
        elif self.request.authenticated_role == 'tender_owner' and tender.status == 'active.tendering':
            # invalidate bids on tender change
            tender.invalidate_bids_data()
        save_tender(self.request)
        self.LOGGER.info('Updated tender {}'.format(tender.id),
                         extra=context_unpack(self.request,
                                              {'MESSAGE_ID': 'tender_patch'}))
        return {'data': tender.serialize(tender.status)}
    def patch(self):
        """Tender Edit (partial)

        For example here is how procuring entity can change number of items to be procured and total Value of a tender:

        .. sourcecode:: http

            PATCH /tenders/4879d3f8ee2443169b5fbbc9f89fa607 HTTP/1.1
            Host: example.com
            Accept: application/json

            {
                "data": {
                    "value": {
                        "amount": 600
                    },
                    "itemsToBeProcured": [
                        {
                            "quantity": 6
                        }
                    ]
                }
            }

        And here is the response to be expected:

        .. sourcecode:: http

            HTTP/1.0 200 OK
            Content-Type: application/json

            {
                "data": {
                    "id": "4879d3f8ee2443169b5fbbc9f89fa607",
                    "tenderID": "UA-64e93250be76435397e8c992ed4214d1",
                    "dateModified": "2014-10-27T08:12:34.956Z",
                    "value": {
                        "amount": 600
                    },
                    "itemsToBeProcured": [
                        {
                            "quantity": 6
                        }
                    ]
                }
            }

        """
        tender = self.context
        data = self.request.validated["data"]

        if (self.request.authenticated_role == "tender_owner" and
                self.request.validated["tender_status"] == "active.tendering"):
            if "tenderPeriod" in data and "endDate" in data["tenderPeriod"]:
                self.request.validated["tender"].tenderPeriod.import_data(
                    data["tenderPeriod"])
                validate_tender_period_extension_with_working_days(
                    self.request)
                self.request.registry.notify(
                    TenderInitializeEvent(self.request.validated["tender"]))
                self.request.validated["data"][
                    "enquiryPeriod"] = self.request.validated[
                        "tender"].enquiryPeriod.serialize()

        apply_patch(self.request,
                    save=False,
                    src=self.request.validated["tender_src"])
        if self.request.authenticated_role == "chronograph":
            check_status(self.request)
        elif self.request.authenticated_role == "tender_owner" and tender.status == "active.tendering":
            # invalidate bids on tender change
            tender.invalidate_bids_data()
        save_tender(self.request)
        self.LOGGER.info("Updated tender {}".format(tender.id),
                         extra=context_unpack(self.request,
                                              {"MESSAGE_ID": "tender_patch"}))
        return {"data": tender.serialize(tender.status)}
    def patch(self):
        """Tender Edit (partial)

        For example here is how procuring entity can change number of items to be procured and total Value of a tender:

        .. sourcecode:: http

            PATCH /tenders/4879d3f8ee2443169b5fbbc9f89fa607 HTTP/1.1
            Host: example.com
            Accept: application/json

            {
                "data": {
                    "value": {
                        "amount": 600
                    },
                    "itemsToBeProcured": [
                        {
                            "quantity": 6
                        }
                    ]
                }
            }

        And here is the response to be expected:

        .. sourcecode:: http

            HTTP/1.0 200 OK
            Content-Type: application/json

            {
                "data": {
                    "id": "4879d3f8ee2443169b5fbbc9f89fa607",
                    "tenderID": "UA-64e93250be76435397e8c992ed4214d1",
                    "dateModified": "2014-10-27T08:12:34.956Z",
                    "value": {
                        "amount": 600
                    },
                    "itemsToBeProcured": [
                        {
                            "quantity": 6
                        }
                    ]
                }
            }

        """
        tender = self.context
        data = self.request.validated['data']

        if self.request.authenticated_role == 'tender_owner' and self.request.validated['tender_status'] == 'active.tendering':
            if 'tenderPeriod' in data and 'endDate' in data['tenderPeriod']:
                self.request.validated['tender'].tenderPeriod.import_data(data['tenderPeriod'])
                validate_tender_period_extension_with_working_days(self.request)
                self.request.registry.notify(TenderInitializeEvent(self.request.validated['tender']))
                self.request.validated['data']["enquiryPeriod"] = self.request.validated['tender'].enquiryPeriod.serialize()

        apply_patch(self.request, save=False, src=self.request.validated['tender_src'])
        if self.request.authenticated_role == 'chronograph':
            check_status(self.request)
        elif self.request.authenticated_role == 'tender_owner' and tender.status == 'active.tendering':
            # invalidate bids on tender change
            tender.invalidate_bids_data()
        save_tender(self.request)
        self.LOGGER.info('Updated tender {}'.format(tender.id),
                    extra=context_unpack(self.request, {'MESSAGE_ID': 'tender_patch'}))
        return {'data': tender.serialize(tender.status)}