[Sqlalchemy-tickets] Issue #3024: Cannot use argument_for on DialectKWArgs not explicitly in construct_arguments (zzzeek/sqlalchemy)

[Dennis H. <iss...@bi...>]

New issue 3024: Cannot use argument_for on DialectKWArgs not explicitly in construct_arguments
https://bitbucket.org/zzzeek/sqlalchemy/issue/3024/cannot-use-argument_for-on-dialectkwargs

Dennis Hennen:

Using 0.9.4

    from sqlalchemy.sql.expression import Insert
    Insert.argument_for('mysql', 'foo', False)

returns

    Traceback (most recent call last):
      File "test.py", line 2, in <module>
        Insert.argument_for('mysql', 'foo', False)
      File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/base.py", line 184, in argument_for
        construct_arg_dictionary[cls][argument_name] = default
    KeyError: <class 'sqlalchemy.sql.dml.Insert'>

Because mysql doesn't have Insert explicitly in it's construct_arguments we get the KeyError.