Python django.core.exceptions.FieldDoesNotExist() Examples

def lookup_field(name, obj, model_admin=None):
    opts = obj._meta
    try:
        f = _get_non_gfk_field(opts, name)
    except (FieldDoesNotExist, FieldIsAForeignKeyColumnName):
        # For non-field values, the value is either a method, property or
        # returned via a callable.
        if callable(name):
            attr = name
            value = attr(obj)
        elif model_admin is not None and hasattr(model_admin, name) and name != '__str__':
            attr = getattr(model_admin, name)
            value = attr(obj)
        else:
            attr = getattr(obj, name)
            if callable(attr):
                value = attr()
            else:
                value = attr
        f = None
    else:
        attr = None
        value = getattr(obj, name)
    return f, attr, value 

def _check_raw_id_fields_item(self, obj, model, field_name, label):
        """ Check an item of `raw_id_fields`, i.e. check that field named
        `field_name` exists in model `model` and is a ForeignKey or a
        ManyToManyField. """

        try:
            field = model._meta.get_field(field_name)
        except FieldDoesNotExist:
            return refer_to_missing_field(field=field_name, option=label,
                                          model=model, obj=obj, id='admin.E002')
        else:
            if not field.many_to_many and not isinstance(field, models.ForeignKey):
                return must_be('a foreign key or a many-to-many field',
                               option=label, obj=obj, id='admin.E003')
            else:
                return [] 

def _check_readonly_fields_item(self, cls, model, field_name, label):
        if callable(field_name):
            return []
        elif hasattr(cls, field_name):
            return []
        elif hasattr(model, field_name):
            return []
        else:
            try:
                model._meta.get_field(field_name)
            except FieldDoesNotExist:
                return [
                    checks.Error(
                        "The value of '%s' is not a callable, an attribute of '%s', or an attribute of '%s.%s'." % (
                            label, cls.__name__, model._meta.app_label, model._meta.object_name
                        ),
                        hint=None,
                        obj=cls,
                        id='admin.E035',
                    )
                ]
            else:
                return [] 

def _get_non_gfk_field(opts, name):
    """
    For historical reasons, the admin app relies on GenericForeignKeys as being
    "not found" by get_field(). This could likely be cleaned up.

    Reverse relations should also be excluded as these aren't attributes of the
    model (rather something like `foo_set`).
    """
    field = opts.get_field(name)
    if (field.is_relation and
            # Generic foreign keys OR reverse relations
            ((field.many_to_one and not field.related_model) or field.one_to_many)):
        raise FieldDoesNotExist()

    # Avoid coercing <FK>_id fields to FK
    if field.is_relation and not field.many_to_many and hasattr(field, 'attname') and field.attname == name:
        raise FieldIsAForeignKeyColumnName()

    return field 

def get_field(self, field_name):
        """
        Return a field instance given the name of a forward or reverse field.
        """
        try:
            # In order to avoid premature loading of the relation tree
            # (expensive) we prefer checking if the field is a forward field.
            return self._forward_fields_map[field_name]
        except KeyError:
            # If the app registry is not ready, reverse fields are
            # unavailable, therefore we throw a FieldDoesNotExist exception.
            if not self.apps.models_ready:
                raise FieldDoesNotExist(
                    "%s has no field named '%s'. The app cache isn't ready yet, "
                    "so if this is an auto-created related field, it won't "
                    "be available yet." % (self.object_name, field_name)
                )

        try:
            # Retrieve field instance by name from cached or just-computed
            # field map.
            return self.fields_map[field_name]
        except KeyError:
            raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, field_name)) 

def lookup_needs_distinct(opts, lookup_path):
    """
    Return True if 'distinct()' should be used to query the given lookup path.
    """
    lookup_fields = lookup_path.split(LOOKUP_SEP)
    # Go through the fields (following all relations) and look for an m2m.
    for field_name in lookup_fields:
        if field_name == 'pk':
            field_name = opts.pk.name
        try:
            field = opts.get_field(field_name)
        except FieldDoesNotExist:
            # Ignore query lookups.
            continue
        else:
            if hasattr(field, 'get_path_info'):
                # This field is a relation; update opts to follow the relation.
                path_info = field.get_path_info()
                opts = path_info[-1].to_opts
                if any(path.m2m for path in path_info):
                    # This field is a m2m relation so distinct must be called.
                    return True
    return False 

def _check_radio_fields_key(self, cls, model, field_name, label):
        """ Check that a key of `radio_fields` dictionary is name of existing
        field and that the field is a ForeignKey or has `choices` defined. """

        try:
            field = model._meta.get_field(field_name)
        except FieldDoesNotExist:
            return refer_to_missing_field(field=field_name, option=label,
                                          model=model, obj=cls, id='admin.E022')
        else:
            if not (isinstance(field, models.ForeignKey) or field.choices):
                return [
                    checks.Error(
                        "The value of '%s' refers to '%s', which is not an "
                        "instance of ForeignKey, and does not have a 'choices' definition." % (
                            label, field_name
                        ),
                        hint=None,
                        obj=cls,
                        id='admin.E023',
                    )
                ]
            else:
                return [] 

def _check_raw_id_fields_item(self, cls, model, field_name, label):
        """ Check an item of `raw_id_fields`, i.e. check that field named
        `field_name` exists in model `model` and is a ForeignKey or a
        ManyToManyField. """

        try:
            field = model._meta.get_field(field_name)
        except FieldDoesNotExist:
            return refer_to_missing_field(field=field_name, option=label,
                                          model=model, obj=cls, id='admin.E002')
        else:
            if not isinstance(field, (models.ForeignKey, models.ManyToManyField)):
                return must_be('a ForeignKey or ManyToManyField',
                               option=label, obj=cls, id='admin.E003')
            else:
                return [] 

def _check_to_fields_exist(self):
        # Skip nonexistent models.
        if isinstance(self.remote_field.model, str):
            return []

        errors = []
        for to_field in self.to_fields:
            if to_field:
                try:
                    self.remote_field.model._meta.get_field(to_field)
                except exceptions.FieldDoesNotExist:
                    errors.append(
                        checks.Error(
                            "The to_field '%s' doesn't exist on the related "
                            "model '%s'."
                            % (to_field, self.remote_field.model._meta.label),
                            obj=self,
                            id='fields.E312',
                        )
                    )
        return errors 

def lookup_field(name, obj, model_admin=None):
    opts = obj._meta
    try:
        f = _get_non_gfk_field(opts, name)
    except (FieldDoesNotExist, FieldIsAForeignKeyColumnName):
        # For non-field values, the value is either a method, property or
        # returned via a callable.
        if callable(name):
            attr = name
            value = attr(obj)
        elif hasattr(model_admin, name) and name != '__str__':
            attr = getattr(model_admin, name)
            value = attr(obj)
        else:
            attr = getattr(obj, name)
            if callable(attr):
                value = attr()
            else:
                value = attr
        f = None
    else:
        attr = None
        value = getattr(obj, name)
    return f, attr, value 

def _check_date_hierarchy(self, cls, model):
        """ Check that date_hierarchy refers to DateField or DateTimeField. """

        if cls.date_hierarchy is None:
            return []
        else:
            try:
                field = model._meta.get_field(cls.date_hierarchy)
            except FieldDoesNotExist:
                return refer_to_missing_field(option='date_hierarchy',
                                              field=cls.date_hierarchy,
                                              model=model, obj=cls, id='admin.E127')
            else:
                if not isinstance(field, (models.DateField, models.DateTimeField)):
                    return must_be('a DateField or DateTimeField', option='date_hierarchy',
                                   obj=cls, id='admin.E128')
                else:
                    return [] 

def to_internal_value(self, data):
        if sc.has_features(data):
            for feat in data['features']:
                return self.to_internal_value(feat)
        try:
            sref = SpatialReference(data['crs']['properties']['name'])
        except KeyError:
            sref = None
        # Force evaluation of fields property.
        if not self.fields and self.Meta.geom_field is None:
            raise exceptions.FieldDoesNotExist('Geometry field not found')
        record = {self.Meta.geom_field: data.get('geometry')}
        record.update(data.get('properties', {}))
        feature = super(FeatureSerializer, self).to_internal_value(record)
        if feature and sref:
            geom = feature[self.Meta.geom_field]
            geom.srid = sref.srid
        return feature 

def create_latex_table_data(self, cleaned_data):
        # TODO: enable user to modify column header
        # TODO: add preview PDF
        target_list = TargetList.objects.get(pk=cleaned_data.get('model_pk'))

        table_data = {}
        for field in cleaned_data.get('field_list', []):
            for target in target_list.targets.all():
                try:
                    verbose_name = Target._meta.get_field(field).verbose_name
                    table_data.setdefault(verbose_name, []).append(getattr(target, field))
                except FieldDoesNotExist:
                    table_data.setdefault(field, []).append(TargetExtra.objects.filter(target=target,
                                                                                       key=field).first().value)

        return table_data 

def _check_to_fields_local_valide(self):
        res = []
        for local_field in self._raw_fields.values():
            if isinstance(local_field, LocalFieldValue):
                try:
                    self.model._meta.get_field(local_field.value)
                except FieldDoesNotExist:
                    res.append(
                        checks.Error(
                            "the field %s does not exists on the model %s" % (local_field, self.model),
                            hint=None,
                            obj=self,
                            id='compositefk.E003',
                        )
                    )
        return res 

def _check_recursion_field_dependecy(self):
        res = []
        for local_field in self._raw_fields.values():
            try:
                f = self.model._meta.get_field(local_field.value)
                if isinstance(f, CompositeForeignKey):
                    res.append(
                        checks.Error(
                            "the field %s depend on the field %s which is another CompositeForeignKey" %
                            (self.name, local_field),
                            hint=None,
                            obj=self,
                            id='compositefk.E005',
                        )
                    )
            except FieldDoesNotExist:
                pass  # _check_to_fields_local_valide already raise errors for this
        return res 

def _check_readonly_fields_item(self, obj, model, field_name, label):
        if callable(field_name):
            return []
        elif hasattr(obj, field_name):
            return []
        elif hasattr(model, field_name):
            return []
        else:
            try:
                model._meta.get_field(field_name)
            except FieldDoesNotExist:
                return [
                    checks.Error(
                        "The value of '%s' is not a callable, an attribute of '%s', or an attribute of '%s.%s'." % (
                            label, obj.__class__.__name__, model._meta.app_label, model._meta.object_name
                        ),
                        obj=obj.__class__,
                        id='admin.E035',
                    )
                ]
            else:
                return [] 

def _check_prepopulated_fields_key(self, obj, model, field_name, label):
        """ Check a key of `prepopulated_fields` dictionary, i.e. check that it
        is a name of existing field and the field is one of the allowed types.
        """

        try:
            field = model._meta.get_field(field_name)
        except FieldDoesNotExist:
            return refer_to_missing_field(field=field_name, option=label,
                                          model=model, obj=obj, id='admin.E027')
        else:
            if isinstance(field, (models.DateTimeField, models.ForeignKey, models.ManyToManyField)):
                return [
                    checks.Error(
                        "The value of '%s' refers to '%s', which must not be a DateTimeField, "
                        "a ForeignKey, a OneToOneField, or a ManyToManyField." % (label, field_name),
                        obj=obj.__class__,
                        id='admin.E028',
                    )
                ]
            else:
                return [] 

def _check_radio_fields_key(self, obj, model, field_name, label):
        """ Check that a key of `radio_fields` dictionary is name of existing
        field and that the field is a ForeignKey or has `choices` defined. """

        try:
            field = model._meta.get_field(field_name)
        except FieldDoesNotExist:
            return refer_to_missing_field(field=field_name, option=label,
                                          model=model, obj=obj, id='admin.E022')
        else:
            if not (isinstance(field, models.ForeignKey) or field.choices):
                return [
                    checks.Error(
                        "The value of '%s' refers to '%s', which is not an "
                        "instance of ForeignKey, and does not have a 'choices' definition." % (
                            label, field_name
                        ),
                        obj=obj.__class__,
                        id='admin.E023',
                    )
                ]
            else:
                return [] 

def _check_raw_id_fields_item(self, obj, model, field_name, label):
        """ Check an item of `raw_id_fields`, i.e. check that field named
        `field_name` exists in model `model` and is a ForeignKey or a
        ManyToManyField. """

        try:
            field = model._meta.get_field(field_name)
        except FieldDoesNotExist:
            return refer_to_missing_field(field=field_name, option=label,
                                          model=model, obj=obj, id='admin.E002')
        else:
            if not field.many_to_many and not isinstance(field, models.ForeignKey):
                return must_be('a foreign key or a many-to-many field',
                               option=label, obj=obj, id='admin.E003')
            else:
                return [] 

def get_field(self, field_name):
        """
        Return a field instance given the name of a forward or reverse field.
        """
        try:
            # In order to avoid premature loading of the relation tree
            # (expensive) we prefer checking if the field is a forward field.
            return self._forward_fields_map[field_name]
        except KeyError:
            # If the app registry is not ready, reverse fields are
            # unavailable, therefore we throw a FieldDoesNotExist exception.
            if not self.apps.models_ready:
                raise FieldDoesNotExist(
                    "%s has no field named '%s'. The app cache isn't ready yet, "
                    "so if this is an auto-created related field, it won't "
                    "be available yet." % (self.object_name, field_name)
                )

        try:
            # Retrieve field instance by name from cached or just-computed
            # field map.
            return self.fields_map[field_name]
        except KeyError:
            raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, field_name)) 

def test_no_instances(self):
        """
        Verify that the command correctly notifies the user that there are no instances for migration.
        """
        try:
            with LogCapture() as captured_logs:
                call_command(
                    'migrate_ephemeral',
                    stdout=StringIO(),
                )
                # Verify the logs
                self.assertIn(
                    'Found "0" instances using ephemeral databases',
                    [l[2] for l in captured_logs.actual()])
        except FieldDoesNotExist:
            # Field already removed from database
            pass 

def _check_to_fields_exist(self):
        # Skip nonexistent models.
        if isinstance(self.remote_field.model, str):
            return []

        errors = []
        for to_field in self.to_fields:
            if to_field:
                try:
                    self.remote_field.model._meta.get_field(to_field)
                except exceptions.FieldDoesNotExist:
                    errors.append(
                        checks.Error(
                            "The to_field '%s' doesn't exist on the related "
                            "model '%s'."
                            % (to_field, self.remote_field.model._meta.label),
                            obj=self,
                            id='fields.E312',
                        )
                    )
        return errors 

def _get_non_gfk_field(opts, name):
    """
    For historical reasons, the admin app relies on GenericForeignKeys as being
    "not found" by get_field(). This could likely be cleaned up.

    Reverse relations should also be excluded as these aren't attributes of the
    model (rather something like `foo_set`).
    """
    field = opts.get_field(name)
    if (field.is_relation and
            # Generic foreign keys OR reverse relations
            ((field.many_to_one and not field.related_model) or field.one_to_many)):
        raise FieldDoesNotExist()

    # Avoid coercing <FK>_id fields to FK
    if field.is_relation and not field.many_to_many and hasattr(field, 'attname') and field.attname == name:
        raise FieldIsAForeignKeyColumnName()

    return field 

def test_get_fields_only_searches_forward_on_apps_not_ready(self):
        opts = CassandraThing._meta
        # If apps registry is not ready, get_field() searches over only
        # forward fields.
        opts.apps.models_ready = False
        try:
            # 'data_abstract' is a forward field, and therefore will be found
            self.assertTrue(opts.get_field('data_abstract'))
            msg = (
                "CassandraThing has no field named 'relating_baseperson'. The app "
                "cache isn't ready yet, so if this is an auto-created related "
                "field, it won't be available yet."
            )
            # 'data_abstract' is a reverse field, and will raise an exception
            with self.assertRaisesMessage(FieldDoesNotExist, msg):
                opts.get_field('relating_baseperson')
        finally:
            opts.apps.models_ready = True 

def _check_bad_order_fields(self):
        res = []
        try:
            dependents = list(self.local_related_fields)
        except FieldDoesNotExist:
            return []  # the errors shall be raised befor by _check_recursion_field_dependecy

        for field in self.model._meta.get_fields():
            try:
                dependents.remove(field)
            except ValueError:
                pass
            if field == self:
                if dependents:
                    # we met the current fields, but all dependent fields is not
                    # passed befor : we will have a problem in the init of some objects
                    # where the rest of dependents fields will override the
                    # values set by the current one (see Model.__init__)
                    res.append(
                        checks.Error(
                            "the field %s depend on the fields %s which is defined after. define them befor %s" %
                            (self.name, ",".join(f.name for f in dependents), self.name),
                            hint=None,
                            obj=self,
                            id='compositefk.E006',
                        ))
                break
        return res 

def _check_field_spec_item(self, obj, model, field_name, label):
        if field_name in obj.readonly_fields:
            # Stuff can be put in fields that isn't actually a model field if
            # it's in readonly_fields, readonly_fields will handle the
            # validation of such things.
            return []
        else:
            try:
                field = model._meta.get_field(field_name)
            except FieldDoesNotExist:
                # If we can't find a field on the model that matches, it could
                # be an extra field on the form.
                return []
            else:
                if (isinstance(field, models.ManyToManyField) and
                        not field.remote_field.through._meta.auto_created):
                    return [
                        checks.Error(
                            "The value of '%s' cannot include the ManyToManyField '%s', "
                            "because that field manually specifies a relationship model."
                            % (label, field_name),
                            obj=obj.__class__,
                            id='admin.E013',
                        )
                    ]
                else:
                    return [] 

def _check_filter_item(self, obj, model, field_name, label):
        """ Check one item of `filter_vertical` or `filter_horizontal`, i.e.
        check that given field exists and is a ManyToManyField. """

        try:
            field = model._meta.get_field(field_name)
        except FieldDoesNotExist:
            return refer_to_missing_field(field=field_name, option=label,
                                          model=model, obj=obj, id='admin.E019')
        else:
            if not field.many_to_many:
                return must_be('a many-to-many field', option=label, obj=obj, id='admin.E020')
            else:
                return [] 

def get_related_field(self):
        """
        Return the Field in the 'to' object to which this relationship is tied.
        """
        field = self.model._meta.get_field(self.field_name)
        if not field.concrete:
            raise exceptions.FieldDoesNotExist("No related field named '%s'" % self.field_name)
        return field 

def help_text_for_field(name, model):
    help_text = ""
    try:
        field = _get_non_gfk_field(model._meta, name)
    except (FieldDoesNotExist, FieldIsAForeignKeyColumnName):
        pass
    else:
        if hasattr(field, 'help_text'):
            help_text = field.help_text
    return help_text 

def __get__(self, instance, owner):
        """
        Retrieves and caches the value from the datastore on the first lookup.
        Returns the cached value.
        """
        non_deferred_model = instance._meta.proxy_for_model
        opts = non_deferred_model._meta

        assert instance is not None
        data = instance.__dict__
        if data.get(self.field_name, self) is self:
            # self.field_name is the attname of the field, but only() takes the
            # actual name, so we need to translate it here.
            try:
                f = opts.get_field(self.field_name)
            except FieldDoesNotExist:
                f = [f for f in opts.fields if f.attname == self.field_name][0]
            name = f.name
            # Let's see if the field is part of the parent chain. If so we
            # might be able to reuse the already loaded value. Refs #18343.
            val = self._check_parent_chain(instance, name)
            if val is None:
                instance.refresh_from_db(fields=[self.field_name])
                val = getattr(instance, self.field_name)
            data[self.field_name] = val
        return data[self.field_name]