调用 .alter() 时出现 NotImplementedError (0.13.1)

Question

我在数据联合 python 0.13.1。在我的架构中对 table 执行 .alter() 时，我收到以下错误消息：

---------------------------------------------------------------------------
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

其中一个问题是我没有直接加载架构代码。但是，然后错误消息变为：

---------------------------------------------------------------------------
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)

Answer 2

有道理。目前，alter只能更改次要属性。我还不能修改外键、主键和索引。 Issue #901 对此进行了部分解释：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 table 前后的定义，我将能够生成完整的 ALTER 命令。

调用 .alter() 时出现 NotImplementedError (0.13.1)

NotImplementedError when calling .alter() (0.13.1)

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