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from bson.objectid import ObjectId
from opendc.util.database import DB
from opendc.util.exceptions import ClientError
from opendc.util.rest import Response
class Model:
"""Base class for all models."""
collection_name = '<specified in subclasses>'
@classmethod
def from_id(cls, _id):
"""Fetches the document with given ID from the collection."""
if isinstance(_id, str) and len(_id) == 24:
_id = ObjectId(_id)
elif not isinstance(_id, ObjectId):
return cls(None)
return cls(DB.fetch_one({'_id': _id}, cls.collection_name))
@classmethod
def get_all(cls):
"""Fetches all documents from the collection."""
return cls(DB.fetch_all({}, cls.collection_name))
def __init__(self, obj):
self.obj = obj
def get_id(self):
"""Returns the ID of the enclosed object."""
return self.obj['_id']
def check_exists(self):
"""Raises an error if the enclosed object does not exist."""
if self.obj is None:
raise ClientError(Response(404, 'Not found.'))
def set_property(self, key, value):
"""Sets the given property on the enclosed object, with support for simple nested access."""
if '.' in key:
keys = key.split('.')
self.obj[keys[0]][keys[1]] = value
else:
self.obj[key] = value
def insert(self):
"""Inserts the enclosed object and generates a UUID for it."""
self.obj['_id'] = ObjectId()
DB.insert(self.obj, self.collection_name)
def update(self):
"""Updates the enclosed object and updates the internal reference to the newly inserted object."""
DB.update(self.get_id(), self.obj, self.collection_name)
def delete(self):
"""Deletes the enclosed object in the database, if it existed."""
if self.obj is None:
return None
old_object = self.obj.copy()
DB.delete_one({'_id': self.get_id()}, self.collection_name)
return old_object
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