There is no string input.  If the string you're looking for is, say, the name 
of a dataset what you'd do is make separate calls to the history and workflow 
API.

For example, if you had a history "My important history", and a dataset "My 
input dataset", and no knowledge of the id's (as you shouldn't' have to have, 
externally), it'd be three separate calls.  One to list histories, then you 
would programmatically grab the one you want ("My important history") and the 
ID associated with it.  Then you'd make a call to grab the contents of that 
history, from which you could extract the id of the dataset you had the name 
of.  And from there you know how to execute a workflow with that id (hda, in 
this case).

-Dannon




On Feb 21, 2012, at 7:13 PM, thondeb...@me.com wrote:

> One more question...
> How do I pass a string value to one of the workflow input steps?
> Is there an equivalent of ldda and hda, maybe "str"..
> 
> So 38=str="Some value"
> 
> Where could I find a list of the expected dataset sources?
> 
> Thanks
> 
> Thon
> 
> On Feb 21, 2012, at 03:46 PM, Dannon Baker <dannonba...@me.com> wrote:
> 
>> Hi Thon,
>> 
>> You have the right idea about what's going wrong here. Galaxy is trying to 
>> pull up a library dataset with the ID you specify, but it doesn't exist.
>> 
>> In this context, src refers to the 'type' of dataset input id, more 
>> specifically whether it's from a history or library. 'hda' indicates that 
>> the dataset is from a history, and 'ldda' is what you'll most likely use in 
>> the case of a library dataset. If you browse the history and library API 
>> functionality, you'll see other methods for explicitly grabbing these ids.
>> 
>> My hunch is that you have an id from a history and that you should swap ldda 
>> to hda and give it another shot. Definitely let me know if you run into more 
>> issues, though, and I'll help figure out what's going on.
>> 
>> -Dannon
>> 
>> On Feb 21, 2012, at 6:22 PM, thondeb...@me.com wrote:
>> 
>> > Hi,
>> > 
>> > I tried to run a workflow with the API, but get an Error 500 when I try to 
>> > run the WF...The paster.log shows the following error...
>> > 
>> > $ workflow_execute.py 92cc01ed93dc0f0fc91e3ded35497c0a 
>> > http://srp106:8080/api/workflows ebfb8f50c6abde6d 'TEST the API' 
>> > '1=ldda=7c5ebce002fc9d5c'
>> > 
>> > 
>> > Paster.log
>> > galaxy.web.framework ERROR 2012-02-21 14:36:33,067 Uncaught exception in 
>> > exposed API method:
>> > Traceback (most recent call last):
>> > File 
>> > "/home/tdeboer/code/galaxy-central/lib/galaxy/web/framework/__init__.py", 
>> > line 145, in decorator
>> > return simplejson.dumps( func( self, trans, *args, **kwargs ), indent=4, 
>> > sort_keys=True )
>> > File "/home/tdeboer/code/galaxy-central/lib/galaxy/web/api/workflows.py", 
>> > line 123, in create
>> > hda = ldda.to_history_dataset_association(history, 
>> > add_to_history=add_to_history)
>> > AttributeError: 'NoneType' object has no attribute 
>> > 'to_history_dataset_association'
>> > 172.16.108.6 - - [21/Feb/2012:14:36:32 -0700] "POST 
>> > /api/workflows?key=92cc01ed93dc0f0fc91e3ded35497c0a HTTP/1.1" 500 - "-" 
>> > "Python-urllib/2.6"
>> > 
>> > 
>> > Any ideas?
>> > 
>> > Also...I had a hard time finding out what I should use for the dataset 
>> > source parameter "src" in "step=src=dataset_id" and just tried ldda, but 
>> > would hope there is a little info on what this hda and ldda is?
>> > 
>> > Thanks,
>> > 
>> > Thon
>> > ___________________________________________________________
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>> 
>> One 

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