id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
4994	AlphaFold fetch in getting attribute structure.chains	tic20@…	Tom Goddard	"Reported by Tristan in comment 5 of ticket #4981:

""open 6w1s; open #1 from alphafold"" causes a
traceback in my current installation:

Traceback (most recent call last):
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/cmd_line/tool.py"", line 280, in execute
    cmd.run(cmd_text)
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/core/commands/cli.py"", line 2856, in run
    result = ci.function(session, **kw_args)
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/open_command/cmd.py"", line 118, in cmd_open
    models = Command(session, registry=registry).run(provider_cmd_text,
log=log)[0]
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/core/commands/cli.py"", line 2856, in run
    result = ci.function(session, **kw_args)
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/open_command/cmd.py"", line 150, in provider_open
    models, status = collated_open(session, database_name, ident,
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/open_command/cmd.py"", line 433, in collated_open
    return remember_data_format()
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/open_command/cmd.py"", line 404, in remember_data_format
    models, status = func(*func_args, **func_kw)
  File ""/home/tic20/.local/share/ChimeraX/1.3/site-
packages/chimerax/alphafold/__init__.py"", line 26, in fetch
    return fetcher(session, ident, ignore_cache=ignore_cache, **kw)
  File ""/home/tic20/.local/share/ChimeraX/1.3/site-
packages/chimerax/alphafold/fetch_alphafold.py"", line 27, in
fetch_alphafold
    return fetch_alphafold_for_chains(session, chains,
  File ""/home/tic20/.local/share/ChimeraX/1.3/site-
packages/chimerax/alphafold/fetch_alphafold.py"", line 86, in
fetch_alphafold_for_chains
    _rename_chains(alphafold_model, chain)
  File ""/home/tic20/.local/share/ChimeraX/1.3/site-
packages/chimerax/alphafold/fetch_alphafold.py"", line 161, in
_rename_chains
    schains = structure.chains
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/core/attributes.py"", line 61, in _getattr_
    return base.__getattr__(self, attr_name, look_in_class=base)
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/core/attributes.py"", line 57, in _getattr_
    return look_in_class._attr_registration.get_attr(attr_name)
  File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/core/attributes.py"", line 83, in get_attr
    raise AttributeError(""Execution of '%s' object's '%s' property raised
AttributeError"" % (self.class_.__name__, attr_name)) from None
AttributeError: Execution of 'Structure' object's 'chains' property raised
AttributeError

AttributeError: Execution of 'Structure' object's 'chains' property raised
AttributeError

File ""/usr/libexec/UCSF-ChimeraX-daily/lib/python3.9/site-
packages/chimerax/core/attributes.py"", line 83, in get_attr
raise AttributeError(""Execution of '%s' object's '%s' property raised
AttributeError"" % (self.class_.__name__, attr_name)) from None"	defect	closed	moderate		Input/Output		can't reproduce						all	ChimeraX