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How to use _fresh_queryset method in autotest

Best Python code snippet using autotest_python
resource_lib.py
Source:resource_lib.py
...272class Collection(Resource):273    _DEFAULT_ITEMS_PER_PAGE = 50274    _permitted_methods=('GET', 'POST')275    # subclasses must override these276    queryset = None # or override _fresh_queryset() directly277    entry_class = None278    def __init__(self, request):279        super(Collection, self).__init__(request)280        assert self.entry_class is not None281        if isinstance(self.entry_class, basestring):282            type(self).entry_class = _resolve_class_path(self.entry_class)283        self._query_processor = query_lib.QueryProcessor()284        self.entry_class.add_query_selectors(self._query_processor)285    def _query_parameters_accepted(self):286        params = [('start_index', 'Index of first member to include'),287                  ('items_per_page', 'Number of members to include'),288                  ('full_representations',289                   'True to include full representations of members')]290        for selector in self._query_processor.selectors():291            params.append((selector.name, selector.doc))292        return params293    def _fresh_queryset(self):294        assert self.queryset is not None295        # always copy the queryset before using it to avoid caching296        return self.queryset.all()297    def _entry_from_instance(self, instance):298        return self.entry_class(self._request, instance)299    def _representation(self, entry_instances):300        entries = [self._entry_from_instance(instance)301                   for instance in entry_instances]302        want_full_representation = self._read_bool_parameter(303                'full_representations')304        if want_full_representation:305            self.entry_class.prepare_for_full_representation(entries)306        members = []307        for entry in entries:308            if want_full_representation:309                rep = entry.full_representation()310            else:311                rep = entry.short_representation()312            members.append(rep)313        rep = self.link()314        rep.update({'members': members})315        return rep316    def _read_bool_parameter(self, name):317        if name not in self._query_params:318            return False319        return (self._query_params[name].lower() == 'true')320    def _read_int_parameter(self, name, default):321        if name not in self._query_params:322            return default323        input_value = self._query_params[name]324        try:325            return int(input_value)326        except ValueError:327            raise exceptions.BadRequest('Invalid non-numeric value for %s: %r'328                                        % (name, input_value))329    def _apply_form_query(self, queryset):330        """Apply any query selectors passed as form variables."""331        for parameter, values in self._query_params.lists():332            if ':' in parameter:333                parameter, comparison_type = parameter.split(':', 1)334            else:335                comparison_type = None336            if not self._query_processor.has_selector(parameter):337                continue338            for value in values: # forms keys can have multiple values339                queryset = self._query_processor.apply_selector(340                        queryset, parameter, value,341                        comparison_type=comparison_type)342        return queryset343    def _filtered_queryset(self):344        return self._apply_form_query(self._fresh_queryset())345    def get(self):346        queryset = self._filtered_queryset()347        items_per_page = self._read_int_parameter('items_per_page',348                                                  self._DEFAULT_ITEMS_PER_PAGE)349        start_index = self._read_int_parameter('start_index', 0)350        page = queryset[start_index:(start_index + items_per_page)]351        rep = self._representation(page)352        rep.update({'total_results': len(queryset),353                    'start_index': start_index,354                    'items_per_page': items_per_page})355        return self._basic_response(rep)356    def full_representation(self):357        # careful, this rep can be huge for large collections358        return self._representation(self._fresh_queryset())359    def post(self):360        input_dict = self._decoded_input()361        try:362            instance = self.entry_class.create_instance(input_dict, self)363            entry = self._entry_from_instance(instance)364            entry.update(input_dict)365        except model_logic.ValidationError, exc:366            raise exceptions.BadRequest('Invalid input: %s' % exc)367        # RFC 2616 specifies that we provide the new URI in both the Location368        # header and the body369        response = http.HttpResponse(status=201, # Created370                                     content=entry.href())371        response['Location'] = entry.href()372        return response373class Relationship(Entry):374    _permitted_methods = ('GET', 'DELETE')375    # subclasses must override this with a dict mapping name to entry class376    related_classes = None377    def __init__(self, **kwargs):378        assert len(self.related_classes) == 2379        self.entries = dict((name, kwargs[name])380                            for name in self.related_classes)381        for name in self.related_classes: # sanity check382            assert isinstance(self.entries[name], self.related_classes[name])383        # just grab the request from one of the entries384        some_entry = self.entries.itervalues().next()385        super(Relationship, self).__init__(some_entry._request)386    @classmethod387    def from_uri_args(cls, request, **kwargs):388        # kwargs contains URI args for each entry389        entries = {}390        for name, entry_class in cls.related_classes.iteritems():391            entries[name] = entry_class.from_uri_args(request, **kwargs)392        return cls(**entries)393    def _uri_args(self):394        kwargs = {}395        for name, entry in self.entries.iteritems():396            kwargs.update(entry._uri_args())397        return kwargs398    def short_representation(self):399        rep = self.link()400        for name, entry in self.entries.iteritems():401            rep[name] = entry.short_representation()402        return rep403    @classmethod404    def _get_related_manager(cls, instance):405        """Get the related objects manager for the given instance.406        The instance must be one of the related classes.  This method will407        return the related manager from that instance to instances of the other408        related class.409        """410        this_model = type(instance)411        models = [entry_class.model for entry_class412                  in cls.related_classes.values()]413        if isinstance(instance, models[0]):414            this_model, other_model = models415        else:416            other_model, this_model = models417        _, field = this_model.objects.determine_relationship(other_model)418        this_models_fields = (this_model._meta.fields419                              + this_model._meta.many_to_many)420        if field in this_models_fields:421            manager_name = field.attname422        else:423            # related manager is on other_model, get name of reverse related424            # manager on this_model425            manager_name = field.related.get_accessor_name()426        return getattr(instance, manager_name)427    def _delete_entry(self):428        # choose order arbitrarily429        entry, other_entry = self.entries.itervalues()430        related_manager = self._get_related_manager(entry.instance)431        related_manager.remove(other_entry.instance)432    @classmethod433    def create_instance(cls, input_dict, containing_collection):434        other_name = containing_collection.unfixed_name435        cls._check_for_required_fields(input_dict, (other_name,))436        entry = containing_collection.fixed_entry437        other_entry = containing_collection.resolve_link(input_dict[other_name])438        related_manager = cls._get_related_manager(entry.instance)439        related_manager.add(other_entry.instance)440        return other_entry.instance441    def update(self, input_dict):442        pass443class RelationshipCollection(Collection):444    def __init__(self, request=None, fixed_entry=None):445        if request is None:446            request = fixed_entry._request447        super(RelationshipCollection, self).__init__(request)448        assert issubclass(self.entry_class, Relationship)449        self.related_classes = self.entry_class.related_classes450        self.fixed_name = None451        self.fixed_entry = None452        self.unfixed_name = None453        self.related_manager = None454        if fixed_entry is not None:455            self._set_fixed_entry(fixed_entry)456            entry_uri_arg = self.fixed_entry._uri_args().values()[0]457            self._query_params[self.fixed_name] = entry_uri_arg458    def _set_fixed_entry(self, entry):459        """Set the fixed entry for this collection.460        The entry must be an instance of one of the related entry classes.  This461        method must be called before a relationship is used.  It gets called462        either from the constructor (when collections are instantiated from463        other resource handling code) or from read_query_parameters() (when a464        request is made directly for the collection.465        """466        names = self.related_classes.keys()467        if isinstance(entry, self.related_classes[names[0]]):468            self.fixed_name, self.unfixed_name = names469        else:470            assert isinstance(entry, self.related_classes[names[1]])471            self.unfixed_name, self.fixed_name = names472        self.fixed_entry = entry473        self.unfixed_class = self.related_classes[self.unfixed_name]474        self.related_manager = self.entry_class._get_related_manager(475                entry.instance)476    def _query_parameters_accepted(self):477        return [(name, 'Show relationships for this %s' % entry_class.__name__)478                for name, entry_class479                in self.related_classes.iteritems()]480    def _resolve_query_param(self, name, uri_arg):481        entry_class = self.related_classes[name]482        return entry_class.from_uri_args(self._request, uri_arg)483    def read_query_parameters(self, query_params):484        super(RelationshipCollection, self).read_query_parameters(query_params)485        if not self._query_params:486            raise exceptions.BadRequest(487                    'You must specify one of the parameters %s and %s'488                    % tuple(self.related_classes.keys()))489        query_items = self._query_params.items()490        fixed_entry = self._resolve_query_param(*query_items[0])491        self._set_fixed_entry(fixed_entry)492        if len(query_items) > 1:493            other_fixed_entry = self._resolve_query_param(*query_items[1])494            self.related_manager = self.related_manager.filter(495                    pk=other_fixed_entry.instance.id)496    def _entry_from_instance(self, instance):497        unfixed_entry = self.unfixed_class(self._request, instance)498        entries = {self.fixed_name: self.fixed_entry,499                   self.unfixed_name: unfixed_entry}500        return self.entry_class(**entries)501    def _fresh_queryset(self):...
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