Canvas API format

[Aurelien Petit]

Hello,

I am pretty new with Canvas LMS, I am use to use Rails and ruby but never in this way, I am trying to use the API to enroll a user from another system.

So I go ahead and build my function

data = {

   enrollment: {

user_id: @check_user_exist.first.id.to_s,

type: "StudentEnrollment",

role_id: 3,

enrollment_state: "invited",

course_section_id: @section.first.id.to_i,

limit_privileges_to_course_section: true,

notify: true,

self_enrolled: false,

     }

}

if @check_enrolled_exist.empty?

Net::HTTP.post_form(URI.parse(ENV["URL"] + '/api/v1/sections/'+ @section.first.id.to_s + '/enrollments?access_token=' + ENV["ACCESSTOKEN"]), data)        

else

        puts 'User already enrolled'

end

which seems pretty correct regarding the doc of Canvas about that https://canvas.instructure.com/doc/api/enrollments.html#method.enrollments_api.create

But when i run the script .... 

<Net::HTTPInternalServerError 500 Internal Server Error readbody=true>
I check the log and 

request_parameters: "{\"enrollment\"=>\"{:user_id=>\\\"575\\\", :type=>\\\"StudentEnrollment\\\", :role_id=>3, :enrollment_state=>\\\"invited\\\", :course_section_id=>99, :limit_privileges_to_course_section=>true, :notify=>true, :self_enrolled=>false}\"}"

exception_message: no implicit conversion of Symbol into Integer

I saw a couple of basic explanation http://stackoverflow.com/questions/21402111/typeerror-no-implicit-conversion-of-symbol-into-integer on google but no solution worked out.

can someone tell me what i did wrong?

Many Thanks.

[Cody Cutrer]

The problem is that you are posting a nested hash as a POST param. I.e. on the server side, it got:

 { "enrollment" =>

     "<a serialized string of the entire enrollment hash>" }

Instead you need to either post a hash that looks like:

 { "enrollment[user_id]" => @check_user_exist.first.id.to_s,

   "enrollment[type]" => "StudentEnrollment",

   ... }

OR you can post a fully formed nested hash like you have as JSON as explained at http://stackoverflow.com/questions/2024805/ruby-send-json-request - just replace the `request.body = "{}"` with `request.body = data.to_json`

Cody Cutrer

Software Engineer

Instructure

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[Aurelien Petit]

Many thanks Cody,

Really happy about this google group reactivity, two times I am asking things and always got useful answer and explanation within short time.

Indeed replacing by:

data = {

    "enrollment[user_id]" => @check_user_exist.first.id.to_s,

    "enrollment[type]" => "StudentEnrollment",

   "enrollment[role_id]" => 3,

   "enrollment[enrollment_state]" => "invited",

   "enrollment[course_section_id]" => @section.first.id.to_i,

   "enrollment[limit_privileges_to_course_section]" => true,

   "enrollment[notify]" => true,

   "enrollment[self_enrolled]" => false,

}

Worked but then I am facing another issue which is pretty weird, now the API read my data but send me that

'Couldn''t find User with API id ''576''', '51710cfa-aeef-4c5b-8b5f-660dad2a6069', 'post', '2015-10-15 03:32:48.740607', 'Ruby', 1) RETURNING "id"

But if I pass in debugging mode with rails using binding i have that 

User.find(@check_user_exist.first.id)
=> #<User id: 575, name: "xxxxx", sortable_name: "xxxx xxxx", workflow_state: "pre_registered", merge_to: nil, time_zone: nil, uuid: "chNMF7PDi25a0x2N5cjIeTFjhx91A63ePEiMtbC1", created_at: "2015-10-14 10:15:33", updated_at: "2015-10-15 03:18:01", visibility: nil, avatar_image_url: nil, avatar_image_source: nil, avatar_image_updated_at: nil, phone: nil, school_name: nil, school_position: nil, short_name: nil, deleted_at: nil, show_user_services: true, gender: nil, page_views_count: 0, unread_inbox_items_count: nil, reminder_time_for_due_dates: 172800, reminder_time_for_grading: 0, storage_quota: nil, visible_inbox_types: nil, last_user_note: nil, subscribe_to_emails: nil, features_used: nil, preferences: nil, avatar_state: nil, locale: nil, browser_locale: nil, unread_conversations_count: 0, stuck_sis_fields: "name,sortable_name", public: nil, birthdate: nil, otp_secret_key_enc: nil, otp_secret_key_salt: nil, otp_communication_channel_id: nil, initial_enrollment_type: nil, crocodoc_id: nil, last_logged_out: nil, lti_context_id: nil, crmid: 132>

Is it still about the format of the request? Because the API ask to send a string for the user_id, even thou i Tried  to replace it by an integer and still get this answer.

[Rob Orton]

It kind of looks like it is a string of a string. 

maybe try taking off the to_s on user_id: @check_user_exist.first.id.to_s

-Rob

[Aurelien Petit]

Without the to_s method it is an integer. But I also tried without and still got the same response from the server...

[Cody Cutrer]

I suspect you're hitting https://github.com/instructure/canvas-lms/blob/master/app/controllers/enrollments_api_controller.rb#L418.  Most likely cause being the user doesn't have a valid pseudonym (login).

Cody Cutrer

Software Engineer

Instructure

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