timedeltasを使用してpony ormを照会するアサーションエラー

Question

私はPony orm（バージョン0.7.1、python 3.6.0）を使用してアクセスしているsqlite3データベースを持っています。

カラム/フィールドの1つは、継続時間（timedelta）です。私は、与えられた時間よりも短い持続時間を持つすべての行を選択しようとしています。私がやっているの

最小例：私はこれを実行すると

import pony.orm                  
from datetime import timedelta              

db = pony.orm.Database()               


class TestTime(db.Entity):               
    id = pony.orm.PrimaryKey(int, auto=True)          
    td = pony.orm.Required(timedelta)            


db.bind('sqlite', ':memory:', create_db=True)          
db.generate_mapping(create_tables=True)            

if __name__ == "__main__":               
    with pony.orm.db_session:              
     tt1 = TestTime(td=timedelta(seconds=12))         
     tt2 = TestTime(td=timedelta(seconds=18))         
     db.commit()                 

    delta = timedelta(seconds=15)             
    with pony.orm.db_session:              
     TestTime.select(lambda x: x.td < delta) 

は私がクエリにpony.orm.select(x for x in TestTime if x.td < delta)構文を使用してAssertionError: delta

取得するには、同じエラーを与えます。

Traceback (most recent call last): 
    File "ponytd.py", line 23, in <module> 
    TestTime.select(lambda x: x.td < delta) 
    File "<string>", line 2, in select 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/utils/utils.py", line 58, in cut_traceback 
    return func(*args, **kwargs) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/core.py", line 3596, in select 
    return entity._query_from_args_(args, kwargs=None, frame_depth=3) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/core.py", line 3943, in _query_from_args_ 
    return Query(code_key, inner_expr, globals, locals, cells) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/core.py", line 5087, in __init__ 
    translator = translator_cls(tree, extractors, vartypes, left_join=left_join) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 269, in __init__ 
    translator.dispatch(if_) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 82, in dispatch 
    return ASTTranslator.dispatch(translator, node) # default route 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/asttranslation.py", line 29, in dispatch 
    translator.dispatch(child) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 82, in dispatch 
    return ASTTranslator.dispatch(translator, node) # default route 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/asttranslation.py", line 24, in dispatch 
    stop = translator.call(pre_method, node) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 135, in call 
    reraise(exc_class, exc, tb) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/utils/utils.py", line 85, in reraise 
    try: raise exc.with_traceback(tb) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 125, in call 
    try: monad = method(node) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 649, in preCompare 
    translator.dispatch(right) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 83, in dispatch 
    translator.call(translator.dispatch_external, node) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 135, in call 
    reraise(exc_class, exc, tb) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/utils/utils.py", line 85, in reraise 
    try: raise exc.with_traceback(tb) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 125, in call 
    try: monad = method(node) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 119, in dispatch_external 
    monad = translator.ParamMonad.new(translator, t, (varkey, None, None)) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 1646, in new 
    result = cls(translator, type, paramkey) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 1654, in __init__ 
    Monad.__init__(monad, translator, type) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 1006, in __init__ 
    monad.mixin_init() 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 986, in wrapper 
    return method(monad, *args, **kwargs) 
    File "/home/user/.local/share/virtualenvs/test-Tqz3IJV7/lib/python3.6/site-packages/pony/orm/sqltranslation.py", line 1310, in mixin_init 
    assert monad.type is time 
AssertionError: delta 

は、私が何か間違ったことをやっている、またはそれを行うためのより良い方法があります：それは場合に役立ちます

フル・トレースはありますか？

Answer 1

これはPonyORM自体のバグでした。私は問題hereを開いた、それはPR hereで修正され、0.7.4バージョンのリリースにあるはずです。

残念ながら、0.7.3のリリースに合わせて合併されませんでした。