SQLAlchemy 1.2.15 发布，Python ORM 框架

SQLAlchemy 1.2.15 发布了，SQLAlchemy 是一个 Python 的 SQL 工具包以及数据库对象关系映射框架。它包含整套企业级持久化模式，专门用于高效和高性能的数据库访问。

此版本包含了各种 ORM 级的修复，其中包括 1.2.13 中的一个回退，涉及到与多对多关系的动态关系。

[orm] [bug] Fixed bug where the ORM annotations could be incorrect for the primaryjoin/secondaryjoin a relationship if one used the pattern ForeignKey(SomeClass.id) in the declarative mappings. This pattern would leak undesired annotations into the join conditions which can break aliasing operations done within Query that are not supposed to impact elements in that join condition. These annotations are now removed up front if present.
References: #4367
[orm] [bug] In continuing with a similar theme as that of very recent #4349, repaired issue with RelationshipProperty.Comparator.any() andRelationshipProperty.Comparator.has() where the “secondary” selectable needs to be explicitly part of the FROM clause in the EXISTS subquery to suit the case where this “secondary” is a Join object.
References: #4366
[orm] [bug] Fixed regression caused by #4349 where adding the “secondary” table to the FROM clause for a dynamic loader would affect the ability of the Query to make a subsequent join to another entity. The fix adds the primary entity as the first element of the FROM list since Query.join() wants to jump from that. Version 1.3 will have a more comprehensive solution to this problem as well (#4365).
References: #4363
[orm] [bug] Fixed bug where chaining of mapper options using RelationshipProperty.of_type() in conjunction with a chained option that refers to an attribute name by string only would fail to locate the attribute.

[bug] [declarative] [orm] A warning is emitted in the case that a column() object is applied to a declarative class, as it seems likely this intended to be a Column object.
References: #4374

Added support for the write_timeout flag accepted by mysqlclient and pymysql to be passed in the URL string.
References: #4381
Fixed issue where reflection of a PostgreSQL domain that is expressed as an array would fail to be recognized. Pull request courtesy Jakub Synowiec.¶
References: #4377, #4380

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