/
fields.py
2001 lines (1561 loc) · 66.8 KB
/
fields.py
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import datetime
import decimal
import itertools
import re
import time
import urllib.request, urllib.error, urllib.parse
import uuid
import warnings
from operator import itemgetter
import collections
try:
import dateutil
except ImportError:
dateutil = None
else:
import dateutil.parser
import pymongo
import gridfs
from bson import Binary, DBRef, SON, ObjectId
from mongoengine.errors import ValidationError
from mongoengine.python_support import (PY3, bin_type, txt_type,
str_types, StringIO)
from .base import (BaseField, ComplexBaseField, ObjectIdField, GeoJsonBaseField,
get_document, BaseDocument)
from .queryset import DO_NOTHING, QuerySet
from .document import Document, EmbeddedDocument
from .connection import get_db, DEFAULT_CONNECTION_NAME
try:
from PIL import Image, ImageOps
except ImportError:
Image = None
ImageOps = None
__all__ = [
'StringField', 'URLField', 'EmailField', 'IntField', 'LongField',
'FloatField', 'DecimalField', 'BooleanField', 'DateTimeField',
'ComplexDateTimeField', 'EmbeddedDocumentField', 'ObjectIdField',
'GenericEmbeddedDocumentField', 'DynamicField', 'ListField',
'SortedListField', 'EmbeddedDocumentListField', 'DictField',
'MapField', 'ReferenceField', 'CachedReferenceField',
'GenericReferenceField', 'BinaryField', 'GridFSError', 'GridFSProxy',
'FileField', 'ImageGridFsProxy', 'ImproperlyConfigured', 'ImageField',
'GeoPointField', 'PointField', 'LineStringField', 'PolygonField',
'SequenceField', 'UUIDField', 'MultiPointField', 'MultiLineStringField',
'MultiPolygonField', 'GeoJsonBaseField']
RECURSIVE_REFERENCE_CONSTANT = 'self'
class StringField(BaseField):
"""A unicode string field.
"""
def __init__(self, regex=None, max_length=None, min_length=None, **kwargs):
self.regex = re.compile(regex) if regex else None
self.max_length = max_length
self.min_length = min_length
super(StringField, self).__init__(**kwargs)
def to_python(self, value):
if isinstance(value, str):
return value
try:
value = value.decode('utf-8')
except:
pass
return value
def validate(self, value):
if not isinstance(value, str):
self.error('StringField only accepts string values')
if self.max_length is not None and len(value) > self.max_length:
self.error('String value is too long')
if self.min_length is not None and len(value) < self.min_length:
self.error('String value is too short')
if self.regex is not None and self.regex.match(value) is None:
self.error('String value did not match validation regex')
def lookup_member(self, member_name):
return None
def prepare_query_value(self, op, value):
if not isinstance(op, str):
return value
if op.lstrip('i') in ('startswith', 'endswith', 'contains', 'exact'):
flags = 0
if op.startswith('i'):
flags = re.IGNORECASE
op = op.lstrip('i')
regex = r'%s'
if op == 'startswith':
regex = r'^%s'
elif op == 'endswith':
regex = r'%s$'
elif op == 'exact':
regex = r'^%s$'
# escape unsafe characters which could lead to a re.error
value = re.escape(value)
value = re.compile(regex % value, flags)
return super(StringField, self).prepare_query_value(op, value)
class URLField(StringField):
"""A field that validates input as an URL.
.. versionadded:: 0.3
"""
_URL_REGEX = re.compile(
r'^(?:[a-z0-9\.\-]*)://' # scheme is validated separately
r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}(?<!-)\.?)|' # domain...
r'localhost|' # localhost...
r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|' # ...or ipv4
r'\[?[A-F0-9]*:[A-F0-9:]+\]?)' # ...or ipv6
r'(?::\d+)?' # optional port
r'(?:/?|[/?]\S+)$', re.IGNORECASE)
_URL_SCHEMES = ['http', 'https', 'ftp', 'ftps']
def __init__(self, verify_exists=False, url_regex=None, schemes=None, **kwargs):
self.verify_exists = verify_exists
self.url_regex = url_regex or self._URL_REGEX
self.schemes = schemes or self._URL_SCHEMES
super(URLField, self).__init__(**kwargs)
def validate(self, value):
# Check first if the scheme is valid
scheme = value.split('://')[0].lower()
if scheme not in self.schemes:
self.error('Invalid scheme {} in URL: {}'.format(scheme, value))
return
# Then check full URL
if not self.url_regex.match(value):
self.error('Invalid URL: {}'.format(value))
return
if self.verify_exists:
warnings.warn(
"The URLField verify_exists argument has intractable security "
"and performance issues. Accordingly, it has been deprecated.",
DeprecationWarning)
try:
request = urllib.request.Request(value)
urllib.request.urlopen(request)
except Exception as e:
self.error('This URL appears to be a broken link: %s' % e)
class EmailField(StringField):
"""A field that validates input as an E-Mail-Address.
.. versionadded:: 0.4
"""
EMAIL_REGEX = re.compile(
# dot-atom
r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*"
# quoted-string
r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*"'
# domain (max length of an ICAAN TLD is 22 characters)
r')@(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}|[A-Z0-9-]{2,}(?<!-))$', re.IGNORECASE
)
def validate(self, value):
if not EmailField.EMAIL_REGEX.match(value):
self.error('Invalid Mail-address: %s' % value)
super(EmailField, self).validate(value)
class IntField(BaseField):
"""An 32-bit integer field.
"""
def __init__(self, min_value=None, max_value=None, **kwargs):
self.min_value, self.max_value = min_value, max_value
super(IntField, self).__init__(**kwargs)
def to_python(self, value):
try:
value = int(value)
except ValueError:
pass
return value
def validate(self, value):
try:
value = int(value)
except:
self.error('%s could not be converted to int' % value)
if self.min_value is not None and value < self.min_value:
self.error('Integer value is too small')
if self.max_value is not None and value > self.max_value:
self.error('Integer value is too large')
def prepare_query_value(self, op, value):
if value is None:
return value
return super(IntField, self).prepare_query_value(op, int(value))
class LongField(BaseField):
"""An 64-bit integer field.
"""
def __init__(self, min_value=None, max_value=None, **kwargs):
self.min_value, self.max_value = min_value, max_value
super(LongField, self).__init__(**kwargs)
def to_python(self, value):
try:
value = int(value)
except ValueError:
pass
return value
def validate(self, value):
try:
value = int(value)
except:
self.error('%s could not be converted to long' % value)
if self.min_value is not None and value < self.min_value:
self.error('Long value is too small')
if self.max_value is not None and value > self.max_value:
self.error('Long value is too large')
def prepare_query_value(self, op, value):
if value is None:
return value
return super(LongField, self).prepare_query_value(op, int(value))
class FloatField(BaseField):
"""An floating point number field.
"""
def __init__(self, min_value=None, max_value=None, **kwargs):
self.min_value, self.max_value = min_value, max_value
super(FloatField, self).__init__(**kwargs)
def to_python(self, value):
try:
value = float(value)
except ValueError:
pass
return value
def validate(self, value):
if isinstance(value, int):
value = float(value)
if not isinstance(value, float):
self.error('FloatField only accepts float values')
if self.min_value is not None and value < self.min_value:
self.error('Float value is too small')
if self.max_value is not None and value > self.max_value:
self.error('Float value is too large')
def prepare_query_value(self, op, value):
if value is None:
return value
return super(FloatField, self).prepare_query_value(op, float(value))
class DecimalField(BaseField):
"""A fixed-point decimal number field.
.. versionchanged:: 0.8
.. versionadded:: 0.3
"""
def __init__(self, min_value=None, max_value=None, force_string=False,
precision=2, rounding=decimal.ROUND_HALF_UP, **kwargs):
"""
:param min_value: Validation rule for the minimum acceptable value.
:param max_value: Validation rule for the maximum acceptable value.
:param force_string: Store as a string.
:param precision: Number of decimal places to store.
:param rounding: The rounding rule from the python decimal library:
- decimal.ROUND_CEILING (towards Infinity)
- decimal.ROUND_DOWN (towards zero)
- decimal.ROUND_FLOOR (towards -Infinity)
- decimal.ROUND_HALF_DOWN (to nearest with ties going towards zero)
- decimal.ROUND_HALF_EVEN (to nearest with ties going to nearest even integer)
- decimal.ROUND_HALF_UP (to nearest with ties going away from zero)
- decimal.ROUND_UP (away from zero)
- decimal.ROUND_05UP (away from zero if last digit after rounding towards zero would have been 0 or 5; otherwise towards zero)
Defaults to: ``decimal.ROUND_HALF_UP``
"""
self.min_value = min_value
self.max_value = max_value
self.force_string = force_string
self.precision = precision
self.rounding = rounding
super(DecimalField, self).__init__(**kwargs)
def to_python(self, value):
if value is None:
return value
# Convert to string for python 2.6 before casting to Decimal
try:
value = decimal.Decimal("%s" % value)
except decimal.InvalidOperation:
return value
return value.quantize(decimal.Decimal(".%s" % ("0" * self.precision)), rounding=self.rounding)
def to_mongo(self, value, use_db_field=True):
if value is None:
return value
if self.force_string:
return str(value)
return float(self.to_python(value))
def validate(self, value):
if not isinstance(value, decimal.Decimal):
if not isinstance(value, str):
value = str(value)
try:
value = decimal.Decimal(value)
except Exception as exc:
self.error('Could not convert value to decimal: %s' % exc)
if self.min_value is not None and value < self.min_value:
self.error('Decimal value is too small')
if self.max_value is not None and value > self.max_value:
self.error('Decimal value is too large')
def prepare_query_value(self, op, value):
return super(DecimalField, self).prepare_query_value(op, self.to_mongo(value))
class BooleanField(BaseField):
"""A boolean field type.
.. versionadded:: 0.1.2
"""
def to_python(self, value):
try:
value = bool(value)
except ValueError:
pass
return value
def validate(self, value):
if not isinstance(value, bool):
self.error('BooleanField only accepts boolean values')
class DateTimeField(BaseField):
"""A datetime field.
Uses the python-dateutil library if available alternatively use time.strptime
to parse the dates. Note: python-dateutil's parser is fully featured and when
installed you can utilise it to convert varying types of date formats into valid
python datetime objects.
Note: Microseconds are rounded to the nearest millisecond.
Pre UTC microsecond support is effectively broken.
Use :class:`~mongoengine.fields.ComplexDateTimeField` if you
need accurate microsecond support.
"""
def validate(self, value):
new_value = self.to_mongo(value)
if not isinstance(new_value, (datetime.datetime, datetime.date)):
self.error('cannot parse date "%s"' % value)
def to_mongo(self, value):
if value is None:
return value
if isinstance(value, datetime.datetime):
return value
if isinstance(value, datetime.date):
return datetime.datetime(value.year, value.month, value.day)
if isinstance(value, collections.Callable):
return value()
if not isinstance(value, str):
return None
# Attempt to parse a datetime:
if dateutil:
try:
return dateutil.parser.parse(value)
except (TypeError, ValueError):
return None
# split usecs, because they are not recognized by strptime.
if '.' in value:
try:
value, usecs = value.split('.')
usecs = int(usecs)
except ValueError:
return None
else:
usecs = 0
kwargs = {'microsecond': usecs}
try: # Seconds are optional, so try converting seconds first.
return datetime.datetime(*time.strptime(value,
'%Y-%m-%d %H:%M:%S')[:6], **kwargs)
except ValueError:
try: # Try without seconds.
return datetime.datetime(*time.strptime(value,
'%Y-%m-%d %H:%M')[:5], **kwargs)
except ValueError: # Try without hour/minutes/seconds.
try:
return datetime.datetime(*time.strptime(value,
'%Y-%m-%d')[:3], **kwargs)
except ValueError:
return None
def prepare_query_value(self, op, value):
return super(DateTimeField, self).prepare_query_value(op, self.to_mongo(value))
class ComplexDateTimeField(StringField):
"""
ComplexDateTimeField handles microseconds exactly instead of rounding
like DateTimeField does.
Derives from a StringField so you can do `gte` and `lte` filtering by
using lexicographical comparison when filtering / sorting strings.
The stored string has the following format:
YYYY,MM,DD,HH,MM,SS,NNNNNN
Where NNNNNN is the number of microseconds of the represented `datetime`.
The `,` as the separator can be easily modified by passing the `separator`
keyword when initializing the field.
.. versionadded:: 0.5
"""
def __init__(self, separator=',', **kwargs):
self.names = ['year', 'month', 'day', 'hour', 'minute', 'second', 'microsecond']
self.separator = separator
self.format = separator.join(['%Y', '%m', '%d', '%H', '%M', '%S', '%f'])
super(ComplexDateTimeField, self).__init__(**kwargs)
def _convert_from_datetime(self, val):
"""
Convert a `datetime` object to a string representation (which will be
stored in MongoDB). This is the reverse function of
`_convert_from_string`.
>>> a = datetime(2011, 6, 8, 20, 26, 24, 92284)
>>> ComplexDateTimeField()._convert_from_datetime(a)
'2011,06,08,20,26,24,092284'
"""
return val.strftime(self.format)
def _convert_from_string(self, data):
"""
Convert a string representation to a `datetime` object (the object you
will manipulate). This is the reverse function of
`_convert_from_datetime`.
>>> a = '2011,06,08,20,26,24,092284'
>>> ComplexDateTimeField()._convert_from_string(a)
datetime.datetime(2011, 6, 8, 20, 26, 24, 92284)
"""
values = list(map(int, data.split(self.separator)))
return datetime.datetime(*values)
def __get__(self, instance, owner):
data = super(ComplexDateTimeField, self).__get__(instance, owner)
if data is None:
return None if self.null else datetime.datetime.now()
if isinstance(data, datetime.datetime):
return data
return self._convert_from_string(data)
def __set__(self, instance, value):
value = self._convert_from_datetime(value) if value else value
return super(ComplexDateTimeField, self).__set__(instance, value)
def validate(self, value):
value = self.to_python(value)
if not isinstance(value, datetime.datetime):
self.error('Only datetime objects may used in a '
'ComplexDateTimeField')
def to_python(self, value):
original_value = value
try:
return self._convert_from_string(value)
except:
return original_value
def to_mongo(self, value):
value = self.to_python(value)
return self._convert_from_datetime(value)
def prepare_query_value(self, op, value):
return super(ComplexDateTimeField, self).prepare_query_value(op, self._convert_from_datetime(value))
class EmbeddedDocumentField(BaseField):
"""An embedded document field - with a declared document_type.
Only valid values are subclasses of :class:`~mongoengine.EmbeddedDocument`.
"""
def __init__(self, document_type, **kwargs):
if not isinstance(document_type, str):
if not issubclass(document_type, EmbeddedDocument):
self.error('Invalid embedded document class provided to an '
'EmbeddedDocumentField')
self.document_type_obj = document_type
super(EmbeddedDocumentField, self).__init__(**kwargs)
@property
def document_type(self):
if isinstance(self.document_type_obj, str):
if self.document_type_obj == RECURSIVE_REFERENCE_CONSTANT:
self.document_type_obj = self.owner_document
else:
self.document_type_obj = get_document(self.document_type_obj)
return self.document_type_obj
def to_python(self, value):
if not isinstance(value, self.document_type):
return self.document_type._from_son(value, _auto_dereference=self._auto_dereference)
return value
def to_mongo(self, value, use_db_field=True, fields=[]):
if not isinstance(value, self.document_type):
return value
return self.document_type.to_mongo(value, use_db_field,
fields=fields)
def validate(self, value, clean=True):
"""Make sure that the document instance is an instance of the
EmbeddedDocument subclass provided when the document was defined.
"""
# Using isinstance also works for subclasses of self.document
if not isinstance(value, self.document_type):
self.error('Invalid embedded document instance provided to an '
'EmbeddedDocumentField')
self.document_type.validate(value, clean)
def lookup_member(self, member_name):
return self.document_type._fields.get(member_name)
def prepare_query_value(self, op, value):
if not isinstance(value, self.document_type):
value = self.document_type._from_son(value)
super(EmbeddedDocumentField, self).prepare_query_value(op, value)
return self.to_mongo(value)
class GenericEmbeddedDocumentField(BaseField):
"""A generic embedded document field - allows any
:class:`~mongoengine.EmbeddedDocument` to be stored.
Only valid values are subclasses of :class:`~mongoengine.EmbeddedDocument`.
.. note ::
You can use the choices param to limit the acceptable
EmbeddedDocument types
"""
def prepare_query_value(self, op, value):
return super(GenericEmbeddedDocumentField, self).prepare_query_value(op, self.to_mongo(value))
def to_python(self, value):
if isinstance(value, dict):
doc_cls = get_document(value['_cls'])
value = doc_cls._from_son(value)
return value
def validate(self, value, clean=True):
if not isinstance(value, EmbeddedDocument):
self.error('Invalid embedded document instance provided to an '
'GenericEmbeddedDocumentField')
value.validate(clean=clean)
def to_mongo(self, document, use_db_field=True):
if document is None:
return None
data = document.to_mongo(use_db_field)
if '_cls' not in data:
data['_cls'] = document._class_name
return data
class DynamicField(BaseField):
"""A truly dynamic field type capable of handling different and varying
types of data.
Used by :class:`~mongoengine.DynamicDocument` to handle dynamic data"""
def to_mongo(self, value):
"""Convert a Python type to a MongoDB compatible type.
"""
if isinstance(value, str):
return value
if hasattr(value, 'to_mongo'):
cls = value.__class__
val = value.to_mongo()
# If we its a document thats not inherited add _cls
if isinstance(value, Document):
val = {"_ref": value.to_dbref(), "_cls": cls.__name__}
if isinstance(value, EmbeddedDocument):
val['_cls'] = cls.__name__
return val
if not isinstance(value, (dict, list, tuple)):
return value
is_list = False
if not hasattr(value, 'items'):
is_list = True
value = dict([(k, v) for k, v in enumerate(value)])
data = {}
for k, v in value.items():
data[k] = self.to_mongo(v)
value = data
if is_list: # Convert back to a list
value = [v for k, v in sorted(iter(data.items()), key=itemgetter(0))]
return value
def to_python(self, value):
if isinstance(value, dict) and '_cls' in value:
doc_cls = get_document(value['_cls'])
if '_ref' in value:
value = doc_cls._get_db().dereference(value['_ref'])
return doc_cls._from_son(value)
return super(DynamicField, self).to_python(value)
def lookup_member(self, member_name):
return member_name
def prepare_query_value(self, op, value):
if isinstance(value, str):
return StringField().prepare_query_value(op, value)
return super(DynamicField, self).prepare_query_value(op, self.to_mongo(value))
def validate(self, value, clean=True):
if hasattr(value, "validate"):
value.validate(clean=clean)
class ListField(ComplexBaseField):
"""A list field that wraps a standard field, allowing multiple instances
of the field to be used as a list in the database.
If using with ReferenceFields see: :ref:`one-to-many-with-listfields`
.. note::
Required means it cannot be empty - as the default for ListFields is []
"""
def __init__(self, field=None, **kwargs):
self.field = field
kwargs.setdefault('default', lambda: [])
super(ListField, self).__init__(**kwargs)
def validate(self, value):
"""Make sure that a list of valid fields is being used.
"""
if (not isinstance(value, (list, tuple, QuerySet)) or
isinstance(value, str)):
self.error('Only lists and tuples may be used in a list field')
super(ListField, self).validate(value)
def prepare_query_value(self, op, value):
if self.field:
if op in ('set', 'unset') and (
not isinstance(value, str) and
not isinstance(value, BaseDocument) and
hasattr(value, '__iter__')):
return [self.field.prepare_query_value(op, v) for v in value]
return self.field.prepare_query_value(op, value)
return super(ListField, self).prepare_query_value(op, value)
class EmbeddedDocumentListField(ListField):
"""A :class:`~mongoengine.ListField` designed specially to hold a list of
embedded documents to provide additional query helpers.
.. note::
The only valid list values are subclasses of
:class:`~mongoengine.EmbeddedDocument`.
.. versionadded:: 0.9
"""
def __init__(self, document_type, **kwargs):
"""
:param document_type: The type of
:class:`~mongoengine.EmbeddedDocument` the list will hold.
:param kwargs: Keyword arguments passed directly into the parent
:class:`~mongoengine.ListField`.
"""
super(EmbeddedDocumentListField, self).__init__(
field=EmbeddedDocumentField(document_type), **kwargs
)
class SortedListField(ListField):
"""A ListField that sorts the contents of its list before writing to
the database in order to ensure that a sorted list is always
retrieved.
.. warning::
There is a potential race condition when handling lists. If you set /
save the whole list then other processes trying to save the whole list
as well could overwrite changes. The safest way to append to a list is
to perform a push operation.
.. versionadded:: 0.4
.. versionchanged:: 0.6 - added reverse keyword
"""
_ordering = None
_order_reverse = False
def __init__(self, field, **kwargs):
if 'ordering' in list(kwargs.keys()):
self._ordering = kwargs.pop('ordering')
if 'reverse' in list(kwargs.keys()):
self._order_reverse = kwargs.pop('reverse')
super(SortedListField, self).__init__(field, **kwargs)
def to_mongo(self, value):
value = super(SortedListField, self).to_mongo(value)
if self._ordering is not None:
return sorted(value, key=itemgetter(self._ordering),
reverse=self._order_reverse)
return sorted(value, reverse=self._order_reverse)
def key_not_string(d):
""" Helper function to recursively determine if any key in a dictionary is
not a string.
"""
for k, v in list(d.items()):
if not isinstance(k, str) or (isinstance(v, dict) and key_not_string(v)):
return True
def key_has_dot_or_dollar(d):
""" Helper function to recursively determine if any key in a dictionary
contains a dot or a dollar sign.
"""
for k, v in list(d.items()):
if ('.' in k or '$' in k) or (isinstance(v, dict) and key_has_dot_or_dollar(v)):
return True
class DictField(ComplexBaseField):
"""A dictionary field that wraps a standard Python dictionary. This is
similar to an embedded document, but the structure is not defined.
.. note::
Required means it cannot be empty - as the default for DictFields is {}
.. versionadded:: 0.3
.. versionchanged:: 0.5 - Can now handle complex / varying types of data
"""
def __init__(self, basecls=None, field=None, *args, **kwargs):
self.field = field
self._auto_dereference = False
self.basecls = basecls or BaseField
if not issubclass(self.basecls, BaseField):
self.error('DictField only accepts dict values')
kwargs.setdefault('default', lambda: {})
super(DictField, self).__init__(*args, **kwargs)
def validate(self, value):
"""Make sure that a list of valid fields is being used.
"""
if not isinstance(value, dict):
self.error('Only dictionaries may be used in a DictField')
if key_not_string(value):
msg = ("Invalid dictionary key - documents must "
"have only string keys")
self.error(msg)
if key_has_dot_or_dollar(value):
self.error('Invalid dictionary key name - keys may not contain "."'
' or "$" characters')
super(DictField, self).validate(value)
def lookup_member(self, member_name):
return DictField(basecls=self.basecls, db_field=member_name)
def prepare_query_value(self, op, value):
match_operators = ['contains', 'icontains', 'startswith',
'istartswith', 'endswith', 'iendswith',
'exact', 'iexact']
if op in match_operators and isinstance(value, str):
return StringField().prepare_query_value(op, value)
if hasattr(self.field, 'field'):
if op in ('set', 'unset') and isinstance(value, dict):
return dict(
(k, self.field.prepare_query_value(op, v))
for k, v in list(value.items()))
return self.field.prepare_query_value(op, value)
return super(DictField, self).prepare_query_value(op, value)
class MapField(DictField):
"""A field that maps a name to a specified field type. Similar to
a DictField, except the 'value' of each item must match the specified
field type.
.. versionadded:: 0.5
"""
def __init__(self, field=None, *args, **kwargs):
if not isinstance(field, BaseField):
self.error('Argument to MapField constructor must be a valid '
'field')
super(MapField, self).__init__(field=field, *args, **kwargs)
class ReferenceField(BaseField):
"""A reference to a document that will be automatically dereferenced on
access (lazily).
Use the `reverse_delete_rule` to handle what should happen if the document
the field is referencing is deleted. EmbeddedDocuments, DictFields and
MapFields does not support reverse_delete_rule and an `InvalidDocumentError`
will be raised if trying to set on one of these Document / Field types.
The options are:
* DO_NOTHING - don't do anything (default).
* NULLIFY - Updates the reference to null.
* CASCADE - Deletes the documents associated with the reference.
* DENY - Prevent the deletion of the reference object.
* PULL - Pull the reference from a :class:`~mongoengine.fields.ListField`
of references
Alternative syntax for registering delete rules (useful when implementing
bi-directional delete rules)
.. code-block:: python
class Bar(Document):
content = StringField()
foo = ReferenceField('Foo')
Bar.register_delete_rule(Foo, 'bar', NULLIFY)
.. note ::
`reverse_delete_rule` does not trigger pre / post delete signals to be
triggered.
.. versionchanged:: 0.5 added `reverse_delete_rule`
"""
def __init__(self, document_type, dbref=False,
reverse_delete_rule=DO_NOTHING, **kwargs):
"""Initialises the Reference Field.
:param dbref: Store the reference as :class:`~pymongo.dbref.DBRef`
or as the :class:`~pymongo.objectid.ObjectId`.id .
:param reverse_delete_rule: Determines what to do when the referring
object is deleted
"""
if not isinstance(document_type, str):
if not issubclass(document_type, (Document, str)):
self.error('Argument to ReferenceField constructor must be a '
'document class or a string')
self.dbref = dbref
self.document_type_obj = document_type
self.reverse_delete_rule = reverse_delete_rule
super(ReferenceField, self).__init__(**kwargs)
@property
def document_type(self):
if isinstance(self.document_type_obj, str):
if self.document_type_obj == RECURSIVE_REFERENCE_CONSTANT:
self.document_type_obj = self.owner_document
else:
self.document_type_obj = get_document(self.document_type_obj)
return self.document_type_obj
def __get__(self, instance, owner):
"""Descriptor to allow lazy dereferencing.
"""
if instance is None:
# Document class being used rather than a document object
return self
# Get value from document instance if available
value = instance._data.get(self.name)
self._auto_dereference = instance._fields[self.name]._auto_dereference
# Dereference DBRefs
if self._auto_dereference and isinstance(value, DBRef):
value = self.document_type._get_db().dereference(value)
if value is not None:
instance._data[self.name] = self.document_type._from_son(value)
return super(ReferenceField, self).__get__(instance, owner)
def to_mongo(self, document):
if isinstance(document, DBRef):
if not self.dbref:
return document.id
return document
id_field_name = self.document_type._meta['id_field']
id_field = self.document_type._fields[id_field_name]
if isinstance(document, Document):
# We need the id from the saved object to create the DBRef
id_ = document.pk
if id_ is None:
self.error('You can only reference documents once they have'
' been saved to the database')
else:
id_ = document
id_ = id_field.to_mongo(id_)
if self.dbref:
collection = self.document_type._get_collection_name()
return DBRef(collection, id_)
return id_
def to_python(self, value):
"""Convert a MongoDB-compatible type to a Python type.
"""
if (not self.dbref and
not isinstance(value, (DBRef, Document, EmbeddedDocument))):
collection = self.document_type._get_collection_name()
value = DBRef(collection, self.document_type.id.to_python(value))
return value
def prepare_query_value(self, op, value):
if value is None:
return None
super(ReferenceField, self).prepare_query_value(op, value)
return self.to_mongo(value)
def validate(self, value):
if not isinstance(value, (self.document_type, DBRef)):
self.error("A ReferenceField only accepts DBRef or documents")
if isinstance(value, Document) and value.id is None:
self.error('You can only reference documents once they have been '
'saved to the database')
def lookup_member(self, member_name):
return self.document_type._fields.get(member_name)
class CachedReferenceField(BaseField):
"""
A referencefield with cache fields to purpose pseudo-joins
.. versionadded:: 0.9
"""
def __init__(self, document_type, fields=[], auto_sync=True, **kwargs):
"""Initialises the Cached Reference Field.