python-sdk/docs/_modules/leancloud/relation.html at python-310 · leancloud/python-sdk

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<!DOCTYPE html>

<head>

<title>leancloud.relation — LeanCloud-Python-SDK 2.6.1 文档</title>

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<a href="../../index.html" class="icon icon-home"> LeanCloud-Python-SDK

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2.6

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<a href="../../index.html">LeanCloud-Python-SDK</a>

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<li>leancloud.relation</li>

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<h1>leancloud.relation 源代码</h1><div class="highlight"><pre>

# coding: utf-8

from __future__ import absolute_import

from __future__ import division

from __future__ import print_function

from __future__ import unicode_literals

import leancloud

from leancloud import operation

__author__ = "asaka <[email protected]>"

<div class="viewcode-block" id="Relation"><a class="viewcode-back" href="../../index.html#leancloud.Relation">[文档]</a>class Relation(object):

def __init__(self, parent, key=None):

self.parent = parent

self.key = key

self.target_class_name = None

<div class="viewcode-block" id="Relation.reverse_query"><a class="viewcode-back" href="../../index.html#leancloud.Relation.reverse_query">[文档]</a> @classmethod

def reverse_query(cls, parent_class, relation_key, child):

"""

创建一个新的 Query 对象，反向查询所有指向此 Relation 的父对象。

:param parent_class: 父类名称

:param relation_key: 父类中 Relation 的字段名

:param child: 子类对象

:return: leancloud.Query

"""

q = leancloud.Query(parent_class)

q.equal_to(relation_key, child._to_pointer())

return q</div>

def _ensure_parent_and_key(self, parent=None, key=None):

if self.parent is None:

self.parent = parent

if self.key is None:

self.key = key

if self.parent != parent:

raise TypeError("relation retrieved from two different object")

if self.key != key:

raise TypeError("relation retrieved from two different object")

<div class="viewcode-block" id="Relation.add"><a class="viewcode-back" href="../../index.html#leancloud.Relation.add">[文档]</a> def add(self, *obj_or_objs):

"""

添加一个新的 leancloud.Object 至 Relation。

:param obj_or_objs: 需要添加的对象或对象列表

"""

objs = obj_or_objs

if not isinstance(obj_or_objs, (list, tuple)):

objs = (obj_or_objs,)

change = operation.Relation(objs, ())

self.parent.set(self.key, change)

self.target_class_name = change._target_class_name</div>

<div class="viewcode-block" id="Relation.remove"><a class="viewcode-back" href="../../index.html#leancloud.Relation.remove">[文档]</a> def remove(self, *obj_or_objs):

"""

从一个 Relation 中删除一个 leancloud.Object 。

:param obj_or_objs: 需要删除的对象或对象列表

:return:

"""

objs = obj_or_objs

objs = (obj_or_objs,)

change = operation.Relation((), objs)

<div class="viewcode-block" id="Relation.dump"><a class="viewcode-back" href="../../index.html#leancloud.Relation.dump">[文档]</a> def dump(self):

return {"__type": "Relation", "className": self.target_class_name}</div>

@property

def query(self):

"""

获取指向 Relation 内容的 Query 对象。

:rtype: leancloud.Query

"""

if self.target_class_name is None:

target_class = leancloud.Object.extend(self.parent._class_name)

query = leancloud.Query(target_class)

query._extra["redirectClassNameForKey"] = self.key

else:

query._add_condition("$relatedTo", "object", self.parent._to_pointer())

query._add_condition("$relatedTo", "key", self.key)

return query</div>

</pre></div>

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