Hi all,

I’m trying to develop a tool that lets you select a file on the server. I’m using the dynamic_options setting to let Galaxy render a dropdown list of available file.

However, when I try to test the tool in its current form, I get the following error:

galaxy.web.framework.decorators ERROR 2016-01-26 13:08:35,649 Uncaught exception in exposed API method:
Traceback (most recent call last):
  File "lib/galaxy/web/framework/decorators.py", line 260, in decorator
    rval = func( self, trans, *args, **kwargs)
  File "lib/galaxy/webapps/galaxy/api/tools.py", line 98, in build
    return tool.to_json(trans, kwd.get('inputs', kwd))
  File "lib/galaxy/tools/__init__.py", line 2602, in to_json
    populate_state(trans, self.inputs, state_inputs, state_errors, params.__dict__)
  File "lib/galaxy/tools/__init__.py", line 2471, in populate_state
    state[input.name] = input.get_initial_value(trans, context, history=history)
  File "lib/galaxy/tools/parameters/basic.py", line 984, in get_initial_value
    value = [ optval for _, optval, selected in options if selected ]
ValueError: too many values to unpack

My tool xml looks like this:


<tool id="archivetolibrary" name="Copy files" version="0.1.0">
  <description>from the archive to a data library</description>
  <code file="list_files.py"/>
  <command interpreter="bash">
    test.sh > $log
    <param name="archive_source" type="select" display="radio" label="Choose source archive">
      <options from_file="archives.loc">
        <column name="name" index="0"/>
        <column name="value" index="1"/>
    <param name="query" type="text" label="Search for files"/>
    <param name="selected_file" type="select" label="Choose your file" dynamic_options="list_files(archive_source,query)"/>
    <data name="log" format="txt" label="${tool.name} on ${on_string}"></data>
This tool copies data from and archive folder to your history. Keep in mind this folder MUST be readable by Galaxy in order for this tool to work.


and the script called in the “code” tag looks like this

def list_files(dir,query): listing=[]
for fname in listdir(dir): 
 fullpath = path.join(dir, fname) #only select datafiles, not md5 checksums 
 if path.isfile(fullpath) and not fullpath.endswith(".md5"): 
 listing.append( fname )
return listing 

This script should return a list with filenames that should be displayed in the dropdown list.

I’m tracking Galaxy release 15.10, running on a Ubuntu 14.04.3 server

Thanks for your help!