InvalidScopeError when using custom Scope in Field
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调研方向
在 student_view 中重现 Table-XBlock/table/table.py 的自定义 Scope 失败，然后通过 xblock/fields.py::get 和 xblock/field_data.py::_field_data 跟踪字段访问。确定为什么自定义 Scope 会引发 InvalidScopeError，而预定义的 scope 可以正常工作；当字段能够在 student_view 中读取且不会引发该异常时即视为完成，如果 repository 提供了合适的测试位置，还应添加回归测试覆盖。
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描述
This is the code I'm currently using to try to do this:
tableStructure = Dict(default={}, scope=Scope(UserScope.NONE, BlockScope.TYPE), help="Help Text")
Whenever I attempt to read the value of the Field, an InvalidScopeError is raised. This doesn't seem to happen with the other predefined Scopes (e.g Scope.content). Furthermore, the error only seems to happen if I attempt to access the value of the Field from within the student_view.
Here is a stack trace:
2014-09-10 10:15:13,883 WARNING 2366 [contentstore.views.preview] preview.py:223 - Unable to render student_view for <TableXBlockWithMixins @4644 rerandomize='never', graded=False, annotation_token_secret='xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx', giturl=None, source_file=None, course_edit_method='Studio', default_tab=None, showanswer='finished', display_name='Table XBlock', video_speed_optimizations=True, chrome=None, showColumns=[], due=None, start=datetime.datetime(2030, 1, 1, 0, 0, tzinfo=<UTC>), tags=[], days_early_for_beta=None, max_attempts=None, text_customization={}, userRows={}, parent=None, format=None, matlab_api_key=None, xqa_key=None, annotation_storage_url='http://your_annotation_storage.com', use_latex_compiler=False, extended_due=None, static_asset_path='', hide_from_toc=False, count=0, name=None, ispublic=None, user_partitions=[], graceperiod=None, visible_to_staff_only=False, tableStructure=???>
Traceback (most recent call last):
File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/preview.py", line 221, in get_preview_fragment
fragment = module.render(preview_view, context)
File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/core.py", line 289, in render
return self.runtime.render(self, view, context)
File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/x_module.py", line 1166, in render
return block.xmodule_runtime.render(to_render, view_name, context)
File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/x_module.py", line 1029, in render
return super(MetricsMixin, self).render(block, view_name, context=context)
File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/runtime.py", line 586, in render
frag = view_fn(context)
File "/edx/app/edxapp/edx-platform/Table-XBlock/table/table.py", line 68, in student_view
tab = self.tableStructure
File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/fields.py", line 369, in __get__
if xblock._field_data.has(xblock, self.name):
File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/field_data.py", line 174, in has
return self._field_data(block, name).has(block, name)
File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/field_data.py", line 153, in _field_data
raise InvalidScopeError(scope)
InvalidScopeError: ScopeBase(user=UserScope.NONE, block=BlockScope.TYPE, name=u'UserScope.NONE_BlockScope.TYPE')
Traceback (most recent call last):
File "/usr/lib/python2.7/logging/handlers.py", line 810, in emit
self.socket.sendto(msg, self.address)
TypeError: getsockaddrarg: AF_INET address must be tuple, not NoneType
Logged from file preview.py, line 223
[10/Sep/2014 10:15:13] "GET /xblock/i4x://ADL/ADL101/table/ac25938d0f7941878430fbf40c501747/student_view?_=1410358513743 HTTP/1.1" 200 1686
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