Python related.ForeignObjectRel方法代码示例

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def get_field_instance(self, model, field_name):
        field = model._meta.get_field(field_name)
        field_kwargs = {'model': model, 'name': field.name}
        if field.is_relation:
            if not field.related_model:
                # GenericForeignKey
                return
            if self.excluded(field.related_model):
                return
            field_cls = RelationField
            field_kwargs['related_model'] = field.related_model
        else:
            field_cls = self.get_field_cls(field)
        if isinstance(field, (ManyToOneRel, ManyToManyRel, ForeignObjectRel)):
            # Django 1.8 doesn't have .null attribute for these fields
            field_kwargs['nullable'] = True
        else:
            field_kwargs['nullable'] = field.null
        field_kwargs['suggest_options'] = (
            field.name in self.suggest_options.get(model, [])
        )
        return field_cls(**field_kwargs) 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def choices(self):
        yield {
            'selected': self.lookup_exact_val == '' and not self.lookup_isnull_val,
            'query_string': self.query_string({},
                                              [self.lookup_exact_name, self.lookup_isnull_name]),
            'display': _('All'),
        }
        for pk_val, val in self.lookup_choices:
            yield {
                'selected': self.lookup_exact_val == smart_unicode(pk_val),
                'query_string': self.query_string({
                    self.lookup_exact_name: pk_val,
                }, [self.lookup_isnull_name]),
                'display': val,
            }
        if (isinstance(self.field, ForeignObjectRel)
                and self.field.field.null or hasattr(self.field, 'rel')
                and self.field.null):
            yield {
                'selected': bool(self.lookup_isnull_val),
                'query_string': self.query_string({
                    self.lookup_isnull_name: 'True',
                }, [self.lookup_exact_name]),
                'display': EMPTY_CHANGELIST_VALUE,
            } 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def is_related_field(field):
    return isinstance(field, ForeignObjectRel) 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def has_output(self):
        if (isinstance(self.field, ForeignObjectRel) and
                self.field.field.null or hasattr(self.field, 'rel') and
                self.field.null):
            extra = 1
        else:
            extra = 0
        return len(self.lookup_choices) + extra > 1 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def choices(self, cl):
        from django.contrib.admin.views.main import EMPTY_CHANGELIST_VALUE
        yield {
            'selected': self.lookup_val is None and not self.lookup_val_isnull,
            'query_string': cl.get_query_string({},
                [self.lookup_kwarg, self.lookup_kwarg_isnull]),
            'display': _('All'),
        }
        for pk_val, val in self.lookup_choices:
            yield {
                'selected': self.lookup_val == smart_text(pk_val),
                'query_string': cl.get_query_string({
                    self.lookup_kwarg: pk_val,
                }, [self.lookup_kwarg_isnull]),
                'display': val,
            }
        if (isinstance(self.field, ForeignObjectRel) and
                (self.field.field.null or isinstance(self.field.field, ManyToManyField)) or
                hasattr(self.field, 'rel') and (self.field.null or isinstance(self.field, ManyToManyField))):
            yield {
                'selected': bool(self.lookup_val_isnull),
                'query_string': cl.get_query_string({
                    self.lookup_kwarg_isnull: 'True',
                }, [self.lookup_kwarg]),
                'display': EMPTY_CHANGELIST_VALUE,
            } 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def __init__(self, data=None, files=None, instance=None, queryset=None, **kwargs):
        if instance is None:
            self.instance = self.fk.remote_field.model()
        else:
            self.instance = instance

        self.rel_name = ForeignObjectRel(self.fk, self.fk.remote_field.model, related_name=self.fk.remote_field.related_name).get_accessor_name()

        if queryset is None:
            queryset = getattr(self.instance, self.rel_name).all()

        super(BaseChildFormSet, self).__init__(data, files, queryset=queryset, **kwargs) 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def get_value(self, obj):
        field = self.get_field(obj.__class__)

        if isinstance(field, (RelatedField, ForeignObjectRel)):
            return getattr(obj, self.field_name) 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def select_on_queryset(self, queryset):
        """
        This method runs either prefetch_related or select_related on the queryset
        to improve indexing speed of the relation.

        It decides which method to call based on the number of related objects:
         - single (eg ForeignKey, OneToOne), it runs select_related
         - multiple (eg ManyToMany, reverse ForeignKey) it runs prefetch_related
        """
        try:
            field = self.get_field(queryset.model)
        except FieldDoesNotExist:
            return queryset

        if isinstance(field, RelatedField) and not isinstance(field, ParentalManyToManyField):
            if field.many_to_one or field.one_to_one:
                queryset = queryset.select_related(self.field_name)
            elif field.one_to_many or field.many_to_many:
                queryset = queryset.prefetch_related(self.field_name)

        elif isinstance(field, ForeignObjectRel):
            # Reverse relation
            if isinstance(field, OneToOneRel):
                # select_related for reverse OneToOneField
                queryset = queryset.select_related(self.field_name)
            else:
                # prefetch_related for anything else (reverse ForeignKey/ManyToManyField)
                queryset = queryset.prefetch_related(self.field_name)

        return queryset 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def test(cls, field, request, params, model, admin_view, field_path):
        if not (hasattr(field, 'rel') and bool(field.rel) or isinstance(field, ForeignObjectRel)):
            return False
        related_modeladmin = admin_view.admin_site._registry.get(
            get_model_from_relation(field))
        return related_modeladmin and getattr(related_modeladmin, 'relfield_style', None) == 'fk-ajax' 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def has_output(self):
        if (isinstance(self.field, ForeignObjectRel)
                and self.field.field.null or hasattr(self.field, 'rel')
                and self.field.null):
            extra = 1
        else:
            extra = 0
        return len(self.lookup_choices) + extra > 1 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def get_field_parts(model, field_name):
    """
    Get the field parts that represent the traversable relationships from the
    base ``model`` to the final field, described by ``field_name``.

    ex::

        >>> parts = get_field_parts(Book, 'author__first_name')
        >>> [p.verbose_name for p in parts]
        ['author', 'first name']

    """
    parts = field_name.split(LOOKUP_SEP)
    opts = model._meta
    fields = []

    # walk relationships
    for name in parts:
        try:
            field = opts.get_field(name)
        except FieldDoesNotExist:
            return None

        fields.append(field)
        if isinstance(field, RelatedField):
            opts = remote_model(field)._meta
        elif isinstance(field, ForeignObjectRel):
            opts = field.related_model._meta

    return fields 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def verbose_field_name(model, field_name):
    """
    Get the verbose name for a given ``field_name``. The ``field_name``
    will be traversed across relationships. Returns '[invalid name]' for
    any field name that cannot be traversed.

    ex::

        >>> verbose_field_name(Article, 'author__name')
        'author name'

    """
    if field_name is None:
        return '[invalid name]'

    parts = get_field_parts(model, field_name)
    if not parts:
        return '[invalid name]'

    names = []
    for part in parts:
        if isinstance(part, ForeignObjectRel):
            if part.related_name:
                names.append(part.related_name.replace('_', ' '))
            else:
                return '[invalid name]'
        else:
            names.append(force_text(part.verbose_name))

    return ' '.join(names) 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def test_get_related_object(self):
        field_info = self._details(Person, Person._meta.get_field('relating_baseperson'))
        self.assertEqual(field_info[1:], (BasePerson, False, False))
        self.assertIsInstance(field_info[0], related.ForeignObjectRel) 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def test_get_related_m2m(self):
        field_info = self._details(Person, Person._meta.get_field('relating_people'))
        self.assertEqual(field_info[1:], (None, False, True))
        self.assertIsInstance(field_info[0], related.ForeignObjectRel) 

# 需要导入模块: from django.db.models.fields import related [as 别名]
# 或者: from django.db.models.fields.related import ForeignObjectRel [as 别名]
def lookup_allowed(self, lookup, value):
        # Check FKey lookups that are allowed, so that popups produced by
        # ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
        # are allowed to work.
        for l in self.model._meta.related_fkey_lookups:
            for k, v in widgets.url_params_from_lookup_dict(l).items():
                if k == lookup and v == value:
                    return True

        parts = lookup.split(LOOKUP_SEP)

        # Last term in lookup is a query term (__exact, __startswith etc)
        # This term can be ignored.
        if len(parts) > 1 and parts[-1] in QUERY_TERMS:
            parts.pop()

        # Special case -- foo__id__exact and foo__id queries are implied
        # if foo has been specifically included in the lookup list; so
        # drop __id if it is the last part. However, first we need to find
        # the pk attribute name.
        rel_name = None
        for part in parts[:-1]:
            try:
                field, _, _, _ = self.model._meta.get_field_by_name(part)
            except FieldDoesNotExist:
                # Lookups on non-existent fields are ok, since they're ignored
                # later.
                return True
            if hasattr(field, 'rel'):
                if field.rel is None:
                    # This property or relation doesn't exist, but it's allowed
                    # since it's ignored in ChangeList.get_filters().
                    return True
                model = field.rel.to
                rel_name = field.rel.get_related_field().name
            elif isinstance(field, ForeignObjectRel):
                model = field.model
                rel_name = model._meta.pk.name
            else:
                rel_name = None
        if rel_name and len(parts) > 1 and parts[-1] == rel_name:
            parts.pop()

        if len(parts) == 1:
            return True
        clean_lookup = LOOKUP_SEP.join(parts)
        return clean_lookup in self.list_filter