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Saving Mongoengine FileField to disk?

Mongoengine stores FileField and ImageField for GridFS. The easiest way to replicate the functionality of the original File / Image field?

EDIT:

So this is the class that I have at the moment. I can upload files and save them to disk, Mongo has the file path in the database.

I fall for "to_python" because I believe that it needs to create a proxy_class object, but I don’t see how if all I get is the file path (since the value passed to).

import os import datetime from mongoengine.python_support import str_types from django.db.models.fields.files import FieldFile from django.core.files.base import File from django.core.files.storage import default_storage from mongoengine.base import BaseField from mongoengine.connection import get_db, DEFAULT_CONNECTION_NAME from django.utils.encoding import force_text #from django.utils.encoding import force_str class DJFileField(BaseField): proxy_class = FieldFile def __init__(self, db_alias=DEFAULT_CONNECTION_NAME, name=None, upload_to='', storage=None, **kwargs): self.db_alias = db_alias self.storage = storage or default_storage self.upload_to = upload_to if callable(upload_to): self.generate_filename = upload_to super(DJFileField, self).__init__(**kwargs) def __get__(self, instance, owner): # Lots of information on whats going on here can be found # on Django FieldFile implementation, go over to GitHub to # read it. file = instance._data.get(self.name) if isinstance(file, str_types) or file is None: attr = self.proxy_class(instance, self, file) instance._data[self.name] = attr elif isinstance(file, File) and not isinstance(file, FieldFile): file_copy = self.proxy_class(instance, self, file.name) file_copy.file = file file_copy._committed = False instance._data[self.name] = file_copy elif isinstance(file, FieldFile) and not hasattr(file, 'field'): file.instance = instance file.field = self file.storage = self.storage # That was fun, wasn't it? return instance._data[self.name] def __set__(self, instance, value): instance._data[self.name] = value # The 3 methods below get used by the FieldFile proxy_object def get_directory_name(self): return os.path.normpath(force_text(datetime.datetime.now().strftime(self.upload_to))) def get_filename(self, filename): return os.path.normpath(self.storage.get_valid_name(os.path.basename(filename))) def generate_filename(self, instance, filename): return os.path.join(self.get_directory_name(), self.get_filename(filename)) def to_mongo(self, value): # Store the path in MongoDB # I also used this bit to actually save the file to disk. # The value I'm getting here is a FileFiled and it all looks # pretty good at this stage even though I'm not 100% sure # of what going on. import ipdb; ipdb.set_trace() if not value._committed and value is not None: value.save(value.name, value) return value.path return value.path def to_python(self, value): # Now this is the real problem, value is the path that got saved # in mongo. No idea how to return a FileField obj from here. # self.instance and instance throw errors.
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I think this would be a good addition - perhaps it is called LocalFileField to make it more agmatic, and if you provided tests and documents, it would make a great addition to https://github.com/MongoEngine/extras-mongoengine

The only reason I don't sell it is if you use replication, the file will still be stored on only one node.

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