substitution variables in Canvas
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Avinash Sachdewani
Apr 15, 2015, 6:49:02 AM4/15/15
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Can anyone explain the usage of substitution variable that i.e when we should use and How ? Anyone can refer some document it will be great.I found one link (https://github.com/instructure/canvas-lms/blob/master/lib/lti/variable_expander.rb) about this I found on that this ruby programs define the substitution variables am I correct?
Brad Humphrey
Apr 15, 2015, 8:36:18 AM4/15/15
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Take a look at https://canvas.instructure.com/courses/913512/pages/variable-substitution?module_item_id=6827542. Let me know if you have further questions after reading this
On Wed, Apr 15, 2015 at 4:49 AM, Avinash Sachdewani <avinash.sac...@gmail.com> wrote:
Can anyone explain the usage of substitution variable that i.e when we should use and How ? Anyone can refer some document it will be great.I found one link (https://github.com/instructure/canvas-lms/blob/master/lib/lti/variable_expander.rb) about this I found on that this ruby programs define the substitution variables am I correct?
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Becky Kinney
Apr 15, 2015, 10:23:24 AM4/15/15
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I have a question about the api domain. I often see a custom_canvas_api_domain in my LTI parameters, even when I don't add the $Canvas.api.domain to my xml. BUT, it always shows my primary api domain (in my case udel.instructure.com), even when I am on my test instance (udel.test.instructure.com). So, as a work-around, I have been hard coding a value into a custom variable of my own. What I'm wondering is what value I'll get from $Canvas.api.domain. Is it always going to be the primary domain? I will need to understand this more fully when I start making API enabled LTI tools available on other Canvas instances.
Becky Kinney
Academic Technology Services
Becky Kinney
Apr 15, 2015, 10:39:38 AM4/15/15
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I just visited my test server again, and it looks like the problem with custom_canvas_api_domain is fixed, so I guess I can rely on that going forward, as long as I can count on the parameter actually being there on all LTI launches. I know I won't get it on anonymous launches, which is okay, but I guess I'm just looking for reassurance that custom_canvas_api_domain is something I can count on going forward. If not, I can add it to my xml as I have been doing, but with the substitution variable.
Brad Humphrey
Apr 15, 2015, 11:29:43 AM4/15/15
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It should be fine, there was a bug in the generation of that that was fixed a month or so ago
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