On Jun 12, 2008, at 4:05 AM, Artur Siekielski wrote:
>
> Hi.
> I want to have two Table definitions in one MetaData which are the
> same except the name of the second one has "SND_" prefix. To avoid
> duplication of schema definition I looked at Table.tometadata() source
> and created the following function:
>
> def _cloneToSND(table, metadata):
> return Table('SND_' + table.name, metadata, *([c.copy() for c in
> table.columns] + \
> [c.copy() for c in table.constraints]))
>
> But calling metadata.create_all() ends with error:
>
> metadata.create_all(e)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/schema.py", line 1582, in create_all
> bind.create(self, checkfirst=checkfirst, tables=tables)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/engine/base.py", line 1139, in create
> self._run_visitor(self.dialect.schemagenerator, entity,
> connection=connection, **kwargs)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/engine/base.py", line 1168, in _run_visitor
> visitorcallable(self.dialect, conn, **kwargs).traverse(element)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/visitors.py", line 75, in traverse
> return self._non_cloned_traversal(obj)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/visitors.py", line 134, in
> _non_cloned_traversal
> self.traverse_single(target)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/visitors.py", line 35, in traverse_single
> return meth(obj, **kwargs)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/compiler.py", line 756, in visit_metadata
> collection = [t for t in metadata.table_iterator(reverse=False,
> tables=self.tables) if (not self.checkfirst or not
> self.dialect.has_table(self.connection, t.name, schema=t.schema))]
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/schema.py", line 1456, in table_iterator
> return iter(sort_tables(tables, reverse=reverse))
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/util.py", line 21, in sort_tables
> vis.traverse(table)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/visitors.py", line 75, in traverse
> return self._non_cloned_traversal(obj)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/visitors.py", line 134, in
> _non_cloned_traversal
> self.traverse_single(target)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/visitors.py", line 35, in traverse_single
> return meth(obj, **kwargs)
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/sql/util.py", line 15, in visit_foreign_key
> parent_table = fkey.column.table
> File "/usr/share/python2.5/site-packages/SQLAlchemy-0.4.6dev_r4841-
> py2.5.egg/sqlalchemy/schema.py", line 788, in column
> "foreign key" % tname)
> sqlalchemy.exceptions.NoReferencedTableError: Could not find table
> 'ObjectType' with which to generate a foreign key
>
>
> The first table (without SND_ prefix) was created successfully. Any
> ideas how to achieve my goal?
send along a test case that includes whatever ForeignKey references to/
from ObjectType might be involved here. My initial guess might be
to lose the "constraints.copy()" section since each Column.copy() will
contain a copied ForeignKey inside of it. copy() has only been used
by the to_metadata() method up til this point.
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