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Frozenset? #306

tschm opened this Issue Nov 6, 2017 · 2 comments


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tschm commented Nov 6, 2017

This is a query I use to select all fields that are of type BB static or BB dynamic:

x = [name for name in select( for f in Field if in set({'BB-static', 'BB-dynamic'}))]

Good Python suggests to remove the set() construct and go directly with {...}. I am running Python 3.6.
However, then {} is a frozenSet and pony fails.


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Vitalium commented Nov 6, 2017

Why not to use list [] or tuple ()?

x = [name for name in select( for f in Field if in ['BB-static', 'BB-dynamic'])]

@kozlovsky kozlovsky added the bug label Nov 12, 2017

@kozlovsky kozlovsky added this to the 0.7.4 milestone Nov 12, 2017

@kozlovsky kozlovsky closed this in 8504c09 Nov 12, 2017


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sashaaero commented Nov 12, 2017

Thanks for reporting, tschm. Fix is already on github.
Now it should work.

kozlovsky added a commit that referenced this issue Jul 23, 2018

Pony ORM Release 0.7.4 (2018-07-23)
# Major features

* Hybrid methods and properties added:
* Allow to base queries on another queries: `select(x.a for x in prev_query if x.b)`
* Added support of Python 3.7
* Added support of PyPy
* `group_concat()` aggregate function added
* pony.flask subpackage added for integration with Flask

# Other features

* `distinct` option added to aggregate functions
* Support of explicit casting to `float` and `bool` in queries

# Improvements

* Apply @cut_traceback decorator only when pony.MODE is 'INTERACTIVE'

# Bugfixes

* In SQLite3 `LIKE` is case sensitive now
* #249: Fix incorrect mixin used for Timedelta
* #251: correct dealing with qualified table names
* #301: Fix aggregation over JSON Column
* #306: Support of frozenset constants added
* #308: Fixed an error when assigning JSON attribute value to the same attribute: obj.json_attr = obj.json_attr
* #313: Fix missed retry on exception raised during db_session.__exit__
* #314: Fix AttributeError: 'NoneType' object has no attribute 'seeds'
* #315: Fix attribute lifting for JSON attributes
* #321: Fix KeyError on obj.delete()
* #325: duplicating percentage sign in raw SQL queries without parameters
* #331: Overriding __len__ in entity fails
* #336: entity declaration serialization
* #357: reconnect after PostgreSQL server closed the connection unexpectedly
* Fix Python implementation of between() function and rename arguments: between(a, x, y) -> between(x, a, b)
* Fix retry handling: in PostgreSQL and Oracle an error can be raised during commit
* Fix optimistic update checks for composite foreign keys
* Don't raise OptimisticCheckError if db_session is not optimistic
* Handling incorrect datetime values in MySQL
* Improved ImportError exception messages when MySQLdb, pymysql, psycopg2 or psycopg2cffi driver was not found
* desc() function fixed to allow reverse its effect by calling desc(desc(x))
* __contains__ method should check if objects belong to the same db_session
* Fix pony.MODE detection; mod_wsgi detection according to official doc
* A lot of inner fixes
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