调用.alter()时的NotImplementedError (0.13.1)

Question

我使用的是数据联合python 0.13.1。当在我的模式中的表上执行.alter()时，我得到了以下错误消息：

---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
<ipython-input-43-f79406c4b690> in <module>
----> 1 MyTable.alter()

/opt/miniconda3/envs/analysis/lib/python3.6/site-packages/datajoint/table.py in alter(self, prompt, context)
    102             del frame
    103         old_definition = self.describe(context=context, printout=False)
--> 104         sql, external_stores = alter(self.definition, old_definition, context)
    105         if not sql:
    106             if prompt:

/opt/miniconda3/envs/analysis/lib/python3.6/site-packages/datajoint/user_tables.py in definition(self)
     75         """
     76         raise NotImplementedError(
---> 77             'Subclasses of Table must implement the property "definition"')
     78 
     79     @ClassProperty

NotImplementedError: Subclasses of Table must implement the property "definition"

我做错了什么？

Answer 1

合乎道理。目前，alter只能更改辅助属性。我还不能修改外键、主键和索引。问题#901部分解释了这一点：https://github.com/datajoint/datajoint-python/issues/901

目前的解决方法是使用SQL ALTER命令，您可以使用dj.conn().query(....)发出该命令。如果您显示之前和之后的表定义，我将能够生成完整的ALTER命令。

Answer 2

其中一个问题是我没有直接加载模式代码。但是，错误消息将更改为：

---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
<ipython-input-6-f79406c4b690> in <module>
----> 1 MyTable.alter()

/opt/miniconda3/envs/analysis/lib/python3.6/site-packages/datajoint/table.py in alter(self, prompt, context)
    102             del frame
    103         old_definition = self.describe(context=context, printout=False)
--> 104         sql, external_stores = alter(self.definition, old_definition, context)
    105         if not sql:
    106             if prompt:

/opt/miniconda3/envs/analysis/lib/python3.6/site-packages/datajoint/declare.py in alter(definition, old_definition, context)
    370         raise NotImplementedError('table.alter cannot alter foreign keys (yet).')
    371     if index_sql != index_sql_:
--> 372         raise NotImplementedError('table.alter cannot alter indexes (yet)')
    373     if attribute_sql != attribute_sql_:
    374         sql.extend(_make_attribute_alter(attribute_sql, attribute_sql_, primary_key))

NotImplementedError: table.alter cannot alter indexes (yet)