Moodle in English: Passing Grades Back To Moodle

Passing Grades Back To Moodle

by Will Knospe - Tuesday, August 15, 2017, 4:26 AM

Hi,

I'm working on developing an external tool for Moodle that is authenticated using LTI. I currently have authentication working properly on clicking the link in Moodle to my external tool. During the sign in, Moodle passes the parameter lis_result_sourcedid, which looks something like this:

{"instanceid":"1","userid":"5","typeid":"1","launchid":740494135},"hash":"500124560eba26b6673d07f04c61ccc3ba6861f874d439b60d378ea7b798ac1d"}

Then, later, when I'm attempting to pass grades back, I need to pass back a sourcedid parameter in my LTI xml. Am I supposed to pass all of this?

Or just the launchid or something like that? I haven't been able to find any clear answers about what's supposed to be passed back through LTI as LTI's documentation has been pretty hard to find.

Re: Passing Grades Back To Moodle

by John Okely - Tuesday, August 15, 2017, 8:36 AM

If you are a member of IMS you may get more help there than here. But let's see if I can help.

For reference, here is what moodle passes back in its provider.

716c919df5a065dd7a3fc5702544d33a:::115:::249:::{"data":{"instanceid":"3","userid":"249","launchid":180548532},"hash":"290ab06bcf0ed944243b530718bdad0d33277884842e3f304cfb95c56c91b752"}

Here is what the test tool provider passes back.

716c919df5a065dd7a3fc5702544d33a:::S3294476:::29123:::dyJ86SiwwA9

Here is the documentation, although you might have already found it http://www.imsglobal.org/specs/ltiv1p1/implementation-guide#toc-17

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Re: Passing Grades Back To Moodle

by JP Slavinsky - Wednesday, October 25, 2017, 11:33 PM

Hi Will - fwiw, in our tool we are passing back that entire sourcedid and it works (which you have likely discovered by now). I was surprised that the sourcedid had this much info and changed on every launch, and still haven't quite figured out if we can always just send back a score for the latest one of these for a particular student.

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Re: Passing Grades Back To Moodle

by JP Slavinsky - Wednesday, October 25, 2017, 11:36 PM

Actually, I just found the answer in the LTI 1.1 implementation guide. Go figure

lis_result_sourcedid=83873872987329873264783687634
This field contains an identifier that indicates the LIS Result Identifier (if any) associated with this launch. This field identifies a unique row and column within the TC gradebook. This field is unique for every combination of resource_link_id / user_id. This value may change for a particular resource_link_id / user_id from one launch to the next. The TP should only retain the most recent value for this field for a particular resource_link_id / user_id. This field is optional.

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LTI and Moodle

Passing Grades Back To Moodle