Exemple #1
0
    def _create_ar(self, context, request):
        """Creates AnalysisRequest object, with supporting Sample, Partition
        and Analysis objects.  The client is retrieved from the obj_path
        key in the request.

        Required request parameters:

            - Contact: One client contact Fullname.  The contact must exist
              in the specified client.  The first Contact with the specified
              value in it's Fullname field will be used.

            - SampleType_<index> - Must be an existing sample type.

        Optional request parameters:

        - CCContacts: A list of contact Fullnames, which will be copied on
          all messages related to this AR and it's sample or results.

        - CCEmails: A list of email addresses to include as above.

        - Sample_id: Create a secondary AR with an existing sample.  If
          unspecified, a new sample is created.

        - Specification: a lookup to set Analysis specs default values
          for all analyses

        - Analysis_Specification: specs (or overrides) per analysis, using
          a special lookup format.

            &Analysis_Specification:list=<Keyword>:min:max:error&...


        """

        wftool = getToolByName(context, 'portal_workflow')
        bc = getToolByName(context, 'bika_catalog')
        bsc = getToolByName(context, 'bika_setup_catalog')
        pc = getToolByName(context, 'portal_catalog')
        ret = {
            "url": router.url_for("create", force_external=True),
            "success": True,
            "error": False,
        }
        SamplingWorkflowEnabled = context.bika_setup.getSamplingWorkflowEnabled()
        for field in [
            'Client',
            'SampleType',
            'Contact',
            'SamplingDate',
            'Services']:
            self.require(field)
            self.used(field)

        try:
            client = resolve_request_lookup(context, request, 'Client')[0].getObject()
        except IndexError:
            raise Exception("Client not found")

        # Sample_id
        if 'Sample' in request:
            try:
                sample = resolve_request_lookup(context, request, 'Sample')[0].getObject()
            except IndexError:
                raise Exception("Sample not found")
        else:
            # Primary AR
            sample = _createObjectByType("Sample", client, tmpID())
            sample.unmarkCreationFlag()
            fields = set_fields_from_request(sample, request)
            for field in fields:
                self.used(field)
            sample._renameAfterCreation()
            sample.setSampleID(sample.getId())
            event.notify(ObjectInitializedEvent(sample))
            sample.at_post_create_script()

            if SamplingWorkflowEnabled:
                wftool.doActionFor(sample, 'sampling_workflow')
            else:
                wftool.doActionFor(sample, 'no_sampling_workflow')

        ret['sample_id'] = sample.getId()

        parts = [{'services': [],
                  'container': [],
                  'preservation': '',
                  'separate': False}]

        specs = self.get_specs_from_request()
        ar = _createObjectByType("AnalysisRequest", client, tmpID())
        ar.unmarkCreationFlag()
        fields = set_fields_from_request(ar, request)
        for field in fields:
            self.used(field)
        ar.setSample(sample.UID())
        ar._renameAfterCreation()
        ret['ar_id'] = ar.getId()
        brains = resolve_request_lookup(context, request, 'Services')
        service_uids = [p.UID for p in brains]
        new_analyses = ar.setAnalyses(service_uids, specs=specs)
        ar.setRequestID(ar.getId())
        ar.reindexObject()
        event.notify(ObjectInitializedEvent(ar))
        ar.at_post_create_script()

        # Create sample partitions
        parts_and_services = {}
        for _i in range(len(parts)):
            p = parts[_i]
            part_prefix = sample.getId() + "-P"
            if '%s%s' % (part_prefix, _i + 1) in sample.objectIds():
                parts[_i]['object'] = sample['%s%s' % (part_prefix, _i + 1)]
                parts_and_services['%s%s' % (part_prefix, _i + 1)] = p['services']
                part = parts[_i]['object']
            else:
                part = _createObjectByType("SamplePartition", sample, tmpID())
                parts[_i]['object'] = part
                container = None
                preservation = p['preservation']
                parts[_i]['prepreserved'] = False
                part.edit(
                    Container=container,
                    Preservation=preservation,
                )
                part.processForm()
                if SamplingWorkflowEnabled:
                    wftool.doActionFor(part, 'sampling_workflow')
                else:
                    wftool.doActionFor(part, 'no_sampling_workflow')
                parts_and_services[part.id] = p['services']

        if SamplingWorkflowEnabled:
            wftool.doActionFor(ar, 'sampling_workflow')
        else:
            wftool.doActionFor(ar, 'no_sampling_workflow')

        # Add analyses to sample partitions
        # XXX jsonapi create AR: right now, all new analyses are linked to the first samplepartition
        if new_analyses:
            analyses = list(part.getAnalyses())
            analyses.extend(new_analyses)
            part.edit(
                Analyses=analyses,
            )
            for analysis in new_analyses:
                analysis.setSamplePartition(part)

        # If Preservation is required for some partitions,
        # and the SamplingWorkflow is disabled, we need
        # to transition to to_be_preserved manually.
        if not SamplingWorkflowEnabled:
            to_be_preserved = []
            sample_due = []
            lowest_state = 'sample_due'
            for p in sample.objectValues('SamplePartition'):
                if p.getPreservation():
                    lowest_state = 'to_be_preserved'
                    to_be_preserved.append(p)
                else:
                    sample_due.append(p)
            for p in to_be_preserved:
                doActionFor(p, 'to_be_preserved')
            for p in sample_due:
                doActionFor(p, 'sample_due')
            doActionFor(sample, lowest_state)
            for analysis in ar.objectValues('Analysis'):
                doActionFor(analysis, lowest_state)
            doActionFor(ar, lowest_state)

        # receive secondary AR
        if request.get('Sample_id', ''):
            doActionFor(ar, 'sampled')
            doActionFor(ar, 'sample_due')
            not_receive = ['to_be_sampled', 'sample_due', 'sampled',
                           'to_be_preserved']
            sample_state = wftool.getInfoFor(sample, 'review_state')
            if sample_state not in not_receive:
                doActionFor(ar, 'receive')
            for analysis in ar.getAnalyses(full_objects=1):
                doActionFor(analysis, 'sampled')
                doActionFor(analysis, 'sample_due')
                if sample_state not in not_receive:
                    doActionFor(analysis, 'receive')

        if self.unused:
            raise BadRequest("The following request fields were not used: %s.  Request aborted." % self.unused)

        return ret
Exemple #2
0
    def create(self, context, request):
        """/@@API/create: Create new object.

        Required parameters:

            - obj_type = portal_type of new object.
            - obj_path = path of new object, from plone site root. - Not required for
             obj_type=AnalysisRequest

        Optionally:

            - obj_id = ID of new object.

        All other parameters in the request are matched against the object's
        Schema.  If a matching field is found in the schema, then the value is
        taken from the request and sent to the field's mutator.

        Reference fields may have their target value(s) specified with a
        delimited string query syntax, containing the portal_catalog search:

            <FieldName>=index1:value1|index2:value2

        eg to set the Client of a batch:

            ...@@API/update?obj_path=<path>...
            ...&Client=title:<client_title>&...

        And, to set a multi-valued reference, these both work:

            ...@@API/update?obj_path=<path>...
            ...&InheritedObjects:list=title:AR1...
            ...&InheritedObjects:list=title:AR2...

            ...@@API/update?obj_path=<path>...
            ...&InheritedObjects[]=title:AR1...
            ...&InheritedObjects[]=title:AR2...

        The Analysis_Specification parameter is special, it mimics
        the format of the python dictionaries, and only service Keyword
        can be used to reference services.  Even if the keyword is not
        actively required, it must be supplied:

            <service_keyword>:min:max:error tolerance

        The function returns a dictionary as a json string:

        {
            runtime: Function running time.
            error: true or string(message) if error. false if no error.
            success: true or string(message) if success. false if no success.
        }

        >>> portal = layer['portal']
        >>> portal_url = portal.absolute_url()
        >>> from plone.app.testing import SITE_OWNER_NAME
        >>> from plone.app.testing import SITE_OWNER_PASSWORD

        Simple AR creation, no obj_path parameter is required:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/create", "&".join([
        ... "obj_type=AnalysisRequest",
        ... "Client=portal_type:Client|id:client-1",
        ... "SampleType=portal_type:SampleType|title:Apple Pulp",
        ... "Contact=portal_type:Contact|getFullname:Rita Mohale",
        ... "Services:list=portal_type:AnalysisService|title:Calcium",
        ... "Services:list=portal_type:AnalysisService|title:Copper",
        ... "Services:list=portal_type:AnalysisService|title:Magnesium",
        ... "SamplingDate=2013-09-29",
        ... "Specification=portal_type:AnalysisSpec|title:Apple Pulp",
        ... ]))
        >>> browser.contents
        '{..."success": true...}'

        If some parameters are specified and are not located as existing fields or properties
        of the created instance, the create should fail:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/create?", "&".join([
        ... "obj_type=Batch",
        ... "obj_path=/batches",
        ... "title=Test",
        ... "Thing=Fish"
        ... ]))
        >>> browser.contents
        '{...The following request fields were not used: ...Thing...}'

        Now we test that the AR create also fails if some fields are spelled wrong

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/create", "&".join([
        ... "obj_type=AnalysisRequest",
        ... "thing=Fish",
        ... "Client=portal_type:Client|id:client-1",
        ... "SampleType=portal_type:SampleType|title:Apple Pulp",
        ... "Contact=portal_type:Contact|getFullname:Rita Mohale",
        ... "Services:list=portal_type:AnalysisService|title:Calcium",
        ... "Services:list=portal_type:AnalysisService|title:Copper",
        ... "Services:list=portal_type:AnalysisService|title:Magnesium",
        ... "SamplingDate=2013-09-29"
        ... ]))
        >>> browser.contents
        '{...The following request fields were not used: ...thing...}'

        """
        savepoint = transaction.savepoint()
        self.context = context
        self.request = request
        self.unused = [x for x in self.request.form.keys()]
        self.used("form.submitted")
        self.used("__ac_name")
        self.used("__ac_password")
        # always require obj_type
        self.require("obj_type")
        obj_type = self.request['obj_type']
        self.used("obj_type")
        # AnalysisRequest shortcut: creates Sample, Partition, AR, Analyses.
        if obj_type == "AnalysisRequest":
            try:
                return self._create_ar(context, request)
            except:
                savepoint.rollback()
                raise
        # Other object types require explicit path as their parent
        self.require("obj_path")
        obj_path = self.request['obj_path']
        if not obj_path.startswith("/"):
            obj_path = "/" + obj_path
        self.used("obj_path")
        site_path = request['PATH_INFO'].replace("/@@API/create", "")
        parent = context.restrictedTraverse(str(site_path + obj_path))
        # normal permissions still apply for this user
        if not getSecurityManager().checkPermission(AccessJSONAPI, parent):
            msg = "You don't have the '{0}' permission on {1}".format(
                AccessJSONAPI, parent.absolute_url())
            raise Unauthorized(msg)

        obj_id = request.get("obj_id", "")
        _renameAfterCreation = False
        if not obj_id:
            _renameAfterCreation = True
            obj_id = tmpID()
        self.used(obj_id)

        ret = {
            "url": router.url_for("create", force_external=True),
            "success": True,
            "error": False,
        }

        try:
            obj = _createObjectByType(obj_type, parent, obj_id)
            obj.unmarkCreationFlag()
            if _renameAfterCreation:
                renameAfterCreation(obj)
            ret['obj_id'] = obj.getId()
            used_fields = set_fields_from_request(obj, request)
            for field in used_fields:
                self.used(field)
            obj.reindexObject()
            obj.aq_parent.reindexObject()
            event.notify(ObjectInitializedEvent(obj))
            obj.at_post_create_script()
        except:
            savepoint.rollback()
            raise

        if self.unused:
            raise BadRequest("The following request fields were not used: %s.  Request aborted." % self.unused)

        return ret
Exemple #3
0
    def update(self, context, request):
        """/@@API/update: Update existing object values

        Required parameters:

            - obj_path: path to the object, relative to plone site root.
            - fields: json value, dict: key:value = fieldname:value.

        {
            runtime: Function running time.
            error: true or string(message) if error. false if no error.
            success: true or string(message) if success. false if no success.
            <fieldname>: <current value>
            ...
        }

        So.

        >>> portal = layer['portal']
        >>> portal_url = portal.absolute_url()
        >>> from plone.app.testing import SITE_OWNER_NAME
        >>> from plone.app.testing import SITE_OWNER_PASSWORD

        Update a client's existing address:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... "title=Test",
        ... "PostalAddress={'address': '1 Wendy Way', 'city': 'Johannesburg', 'zip': '9000', 'state': 'Gauteng', 'district': '', 'country':'South Africa'}"
        ... ]))
        >>> browser.contents
        '{..."success": true...}'

        quickly check that it saved:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/read?", "&".join([
        ... "id=client-1",
        ... "include_fields=PostalAddress",
        ... ]))
        >>> browser.contents
        '{...1 Wendy Way...}'

        Try the same with a nonsense fieldname:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... "Thing=Fish",
        ... ]))
        >>> browser.contents
        '{...The following request fields were not used: ...Thing...}'

        Setting the value of a RefereceField to "" or None (null) should not cause
        an error; setting an empty value should clear the field

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... 'DefaultCategories=',
        ... ]))
        >>> browser.contents
        '{..."success": true...}'

        """
        savepoint = transaction.savepoint()
        self.context = context
        self.request = request
        self.unused = [x for x in self.request.form.keys()]
        self.used("form.submitted")
        self.used("__ac_name")
        self.used("__ac_password")
        ret = {
            "url": router.url_for("update", force_external=True),
            "success": False,
            "error": True,
        }
        obj = None
        # Find out if the object can be retrieved via UID or via
        # traversing.
        if self.request.get('obj_uid', ''):
            uc = getToolByName(self.context, 'uid_catalog')
            brain = uc(UID=self.request.get('obj_uid', ''))
            obj = brain[0].getObject() if brain else None
        if self.request.get('obj_path', '') and not obj:
            obj_path = self.request['obj_path'].split("?")[0]
            site_path = context.portal_url.getPortalObject().getPhysicalPath()
            if site_path and isinstance(site_path, basestring):
                site_path = site_path if site_path.startswith(
                    '/') else '/' + site_path
                obj = context.restrictedTraverse(site_path + obj_path)
            elif site_path and len(site_path) > 1:
                site_path = site_path[1]
                site_path = site_path if site_path.startswith(
                    '/') else '/' + site_path
                obj = context.restrictedTraverse(site_path + obj_path)

        if obj:
            self.used('obj_uid')
            self.used('obj_path')
        else:
            ret['success'] = False
            ret['error'] = True
            return ret

        try:
            fields = set_fields_from_request(obj, request)
            if not fields:
                return ret
            for field in fields:
                self.used(field)
        except:
            savepoint.rollback()
            raise

        ret['success'] = True
        ret['error'] = False

        if self.unused:
            raise BadRequest(
                "The following request fields were not used: %s.  Request aborted."
                % self.unused)

        return ret
Exemple #4
0
    def update_many(self, context, request):
        """/@@API/update_many: Update existing object values

        This is a wrapper around the update method, allowing multiple updates
        to be combined into a single request.

        required parameters:

            - input_values: A json-encoded dictionary.
              Each key is an obj_path, and each value is a dictionary
              containing key/value pairs to be set on the object.

        Return value:

        {
            runtime: Function running time.
            error: true or string(message) if error. false if no error.
            success: true or string(message) if success. false if no success.
            updates: return values from update
        }
        """
        self.context = context
        self.request = request
        self.unused = [x for x in self.request.form.keys()]
        self.used("form.submitted")
        self.used("__ac_name")
        self.used("__ac_password")
        ret = {
            "url": router.url_for("update_many", force_external=True),
            "success": False,
            "error": True,
            "updates": [],
        }

        input_values = json.loads(request.get('input_values', '[]'))
        if not input_values:
            raise BadRequest("missing input_values")
        site_path = request['PATH_INFO'].replace("/@@API/update_many", "")

        for obj_path, i in input_values.items():
            savepoint = transaction.savepoint()
            if not obj_path.startswith("/"):
                obj_path = "/" + obj_path
            if obj_path.startswith(site_path):
                obj_path = obj_path[len(site_path):]
            obj = context.restrictedTraverse(str(site_path + obj_path))
            this_ret = {
                "url": router.url_for("update_many", force_external=True),
                "success": False,
                "error": True,
            }
            try:
                fields = set_fields_from_request(obj, i)
                if not fields:
                    this_ret['success'] = False
                    this_ret['error'] = True
                else:
                    this_ret['success'] = True
                    this_ret['error'] = False
            except:
                savepoint.rollback()
                raise
            ret['updates'].append(this_ret)
        ret['success'] = True
        ret['error'] = False
        return ret
Exemple #5
0
    def update(self, context, request):
        """/@@API/update: Update existing object values

        Required parameters:

            - obj_path: path to the object, relative to plone site root.
            - fields: json value, dict: key:value = fieldname:value.

        {
            runtime: Function running time.
            error: true or string(message) if error. false if no error.
            success: true or string(message) if success. false if no success.
            <fieldname>: <current value>
            ...
        }

        So.

        >>> portal = layer['portal']
        >>> portal_url = portal.absolute_url()
        >>> from plone.app.testing import SITE_OWNER_NAME
        >>> from plone.app.testing import SITE_OWNER_PASSWORD

        Update a client's existing address:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... "title=Test",
        ... "PostalAddress={'address': '1 Wendy Way', 'city': 'Johannesburg', 'zip': '9000', 'state': 'Gauteng', 'district': '', 'country':'South Africa'}"
        ... ]))
        >>> browser.contents
        '{..."success": true...}'

        quickly check that it saved:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/read?", "&".join([
        ... "Title=Happy Hills",
        ... "include_fields=PostalAddress",
        ... ]))
        >>> browser.contents
        '{...1 Wendy Way...}'

        Try the same with a nonsense fieldname:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... "Thing=Fish",
        ... ]))
        >>> browser.contents
        '{...The following request fields were not used: ...Thing...}'

        Setting the value of a RefereceField to "" or None (null) should not cause
        an error; setting an empty value should clear the field

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... "DefaultCategories=\"\"",
        ... ]))
        >>> browser.contents
        '{..."success": true...}'

        """
        savepoint = transaction.savepoint()
        self.context = context
        self.request = request
        self.unused = [x for x in self.request.form.keys()]
        self.used("form.submitted")
        self.used("__ac_name")
        self.used("__ac_password")
        ret = {
            "url": router.url_for("update", force_external=True),
            "success": False,
            "error": True,
        }
        # always require obj_path
        self.require("obj_path")
        obj_path = self.request['obj_path']
        self.used("obj_path")

        site_path = request['PATH_INFO'].replace("/@@API/update", "")
        obj = context.restrictedTraverse(str(site_path + obj_path))

        try:
            fields = set_fields_from_request(obj, request)
            for field in fields:
                self.used(field)
        except:
            savepoint.rollback()
            raise

        ret['success'] = True
        ret['error'] = False

        if self.unused:
            raise BadRequest("The following request fields were not used: %s.  Request aborted." % self.unused)

        return ret
Exemple #6
0
    def update_many(self, context, request):
        """/@@API/update_many: Update existing object values

        This is a wrapper around the update method, allowing multiple updates
        to be combined into a single request.

        required parameters:

            - input_values: A json-encoded dictionary.
              Each key is an obj_path, and each value is a dictionary
              containing key/value pairs to be set on the object.

        Return value:

        {
            runtime: Function running time.
            error: true or string(message) if error. false if no error.
            success: true or string(message) if success. false if no success.
            updates: return values from update
        }
        """
        self.context = context
        self.request = request
        self.unused = [x for x in self.request.form.keys()]
        self.used("form.submitted")
        self.used("__ac_name")
        self.used("__ac_password")
        ret = {
            "url": router.url_for("update_many", force_external=True),
            "success": False,
            "error": True,
            "updates": [],
        }

        input_values = json.loads(request.get('input_values', '[]'))
        if not input_values:
            raise BadRequest("missing input_values")
        site_path = request['PATH_INFO'].replace("/@@API/update_many", "")

        for obj_path, i in input_values.items():
            savepoint = transaction.savepoint()
            if not obj_path.startswith("/"):
                obj_path = "/" + obj_path
            if obj_path.startswith(site_path):
                obj_path = obj_path[len(site_path):]
            obj = context.restrictedTraverse(str(site_path + obj_path))
            this_ret = {
                "url": router.url_for("update_many", force_external=True),
                "success": False,
                "error": True,
            }
            try:
                set_fields_from_request(obj, i)
            except:
                savepoint.rollback()
                raise
            this_ret['success'] = True
            this_ret['error'] = False
            ret['updates'].append(this_ret)
        ret['success'] = True
        ret['error'] = False
        return ret
Exemple #7
0
    def update(self, context, request):
        """/@@API/update: Update existing object values

        Required parameters:

            - obj_path: path to the object, relative to plone site root.
            - fields: json value, dict: key:value = fieldname:value.

        {
            runtime: Function running time.
            error: true or string(message) if error. false if no error.
            success: true or string(message) if success. false if no success.
            <fieldname>: <current value>
            ...
        }

        So.

        >>> portal = layer['portal']
        >>> portal_url = portal.absolute_url()
        >>> from plone.app.testing import SITE_OWNER_NAME
        >>> from plone.app.testing import SITE_OWNER_PASSWORD

        Update a client's existing address:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... "title=Test",
        ... "PostalAddress={'address': '1 Wendy Way', 'city': 'Johannesburg', 'zip': '9000', 'state': 'Gauteng', 'district': '', 'country':'South Africa'}"
        ... ]))
        >>> browser.contents
        '{..."success": true...}'

        quickly check that it saved:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/read?", "&".join([
        ... "id=client-1",
        ... "include_fields=PostalAddress",
        ... ]))
        >>> browser.contents
        '{...1 Wendy Way...}'

        Try the same with a nonsense fieldname:

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... "Thing=Fish",
        ... ]))
        >>> browser.contents
        '{...The following request fields were not used: ...Thing...}'

        Setting the value of a RefereceField to "" or None (null) should not cause
        an error; setting an empty value should clear the field

        >>> browser = layer['getBrowser'](portal, loggedIn=True, username=SITE_OWNER_NAME, password=SITE_OWNER_PASSWORD)
        >>> browser.open(portal_url+"/@@API/update?", "&".join([
        ... "obj_path=/clients/client-1",
        ... 'DefaultCategories=',
        ... ]))
        >>> browser.contents
        '{..."success": true...}'

        """
        savepoint = transaction.savepoint()
        self.context = context
        self.request = request
        self.unused = [x for x in self.request.form.keys()]
        self.used("form.submitted")
        self.used("__ac_name")
        self.used("__ac_password")
        ret = {
            "url": router.url_for("update", force_external=True),
            "success": False,
            "error": True,
        }
        obj = None
        # Find out if the object can be retrieved via UID or via
        # traversing.
        if self.request.get('obj_uid', ''):
            uc = getToolByName(self.context, 'uid_catalog')
            brain = uc(UID=self.request.get('obj_uid', ''))
            obj = brain[0].getObject() if brain else None
        if self.request.get('obj_path', '') and not obj:
            obj_path = self.request['obj_path']
            site_path = context.portal_url.getPortalObject().getPhysicalPath()
            if site_path and isinstance(site_path, basestring):
                site_path = site_path if site_path.startswith('/') else '/' + site_path
                obj = context.restrictedTraverse(site_path + obj_path)
            elif site_path and len(site_path) > 1:
                site_path = site_path[1]
                site_path = site_path if site_path.startswith('/') else '/' + site_path
                obj = context.restrictedTraverse(site_path + obj_path)

        if obj:
            self.used('obj_uid')
            self.used('obj_path')
        else:
            ret['success'] = False
            ret['error'] = True
            return ret

        try:
            fields = set_fields_from_request(obj, request)
            for field in fields:
                self.used(field)
        except:
            savepoint.rollback()
            raise

        ret['success'] = True
        ret['error'] = False

        if self.unused:
            raise BadRequest("The following request fields were not used: %s.  Request aborted." % self.unused)

        return ret