#!/usr/bin/python
# -*- coding: utf-8 -*-
"""FileKeyValue links Files and Keys and Values objects."""
from peewee import ForeignKeyField, CompositeKey
from .base import DB
from .utils import index_hash
from .files import Files
from .values import Values
from .keys import Keys
from ..rest.orm import CherryPyAPI
[docs]class FileKeyValue(CherryPyAPI):
"""
FileKeyValue attributes are foreign keys.
Attributes:
+-------------------+-------------------------------------+
| Name | Description |
+===================+=====================================+
| file | Link to the File model |
+-------------------+-------------------------------------+
| key | Link to the Key model |
+-------------------+-------------------------------------+
| value | Link to the Value model |
+-------------------+-------------------------------------+
"""
file = ForeignKeyField(Files, backref='metadata')
key = ForeignKeyField(Keys, backref='file_links')
value = ForeignKeyField(Values, backref='file_links')
# pylint: disable=too-few-public-methods
class Meta(object):
"""PeeWee meta class contains the database and the primary key."""
database = DB
primary_key = CompositeKey('file', 'key', 'value')
# pylint: enable=too-few-public-methods
[docs] def to_hash(self, **flags):
"""Convert the object to a hash."""
obj = super(FileKeyValue, self).to_hash(**flags)
obj['_id'] = index_hash(int(self.__data__['key']),
int(self.__data__['file']),
int(self.__data__['value']))
obj['file'] = int(self.__data__['file'])
obj['key'] = int(self.__data__['key'])
obj['value'] = int(self.__data__['value'])
return obj
[docs] def from_hash(self, obj):
"""Convert the hash into the object."""
super(FileKeyValue, self).from_hash(obj)
self._set_only_if('file', obj, 'file',
lambda: Files.get(Files.id == obj['file']))
self._set_only_if('key', obj, 'key',
lambda: Keys.get(Keys.id == obj['key']))
self._set_only_if('value', obj, 'value',
lambda: Values.get(Values.id == obj['value']))
[docs] @classmethod
def where_clause(cls, kwargs):
"""Where clause for the various elements."""
where_clause = super(FileKeyValue, cls).where_clause(kwargs)
attrs = ['file', 'key', 'value']
return cls._where_attr_clause(where_clause, kwargs, attrs)