console

Started GET "/presign?filename=bar.jpg" for 127.0.0.1 at 2019-03-16 17:47:32 -0500
Started GET "/presign?filename=foo.pdf" for 127.0.0.1 at 2019-03-16 17:47:32 -0500

Started PATCH "/admin/courses/foobar/lessons/part-1-introduction-to-fun-stuff" for 127.0.0.1 at 2019-03-16 17:48:20 -0500
Processing by Admin::LessonsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"/5MUr1oLT/vaBhy2wnxiZONrx6c21PYshnIdrZAv8uahgoPglKbNujCTu9tXFB2eakk5Doy5ChyNGYRzHAQPxQ==", "lesson"=>{"title"=>"Part 1: Introduction to Fun stuff", "video_link"=>"https://player.vimeo.com/video/316481875?byline=0&portraitrtrait=0", "documents_attributes"=>{"graphic"=>"{\"id\":\"171e46b1408211f235a504146b72e321.pdf\",\"storage\":\"cache\",\"metadata\":{\"size\":361072,\"filename\":\"TheRealMessiah.pdf\",\"mime_type\":\"application/pdf\"}}"}, "description"=>"<p>This is going to be intrsi</>eresting</p>"}, "uploading_image"=>"", "commit"=>"Update Lesson", "course_id"=>"kaballah-of-you", "id"=>"part-1-introduction-to-fun-stuff"}
  Membership Load (0.7ms)  SELECT  "memberships".* FROM "memberships" WHERE "memberships"."id" = $1 LIMIT $2  [["id", 51], ["LIMIT", 1]]
  Course Load (0.5ms)  SELECT  "courses".* FROM "courses" WHERE "courses"."slug" = $1 LIMIT $2  [["slug", "kaballah-of-you"], ["LIMIT", 1]]
  Lesson Load (0.6ms)  SELECT  "lessons".* FROM "lessons" WHERE "lessons"."slug" = $1 LIMIT $2  [["slug", "part-1-introduction-to-fun-stuff"], ["LIMIT", 1]]
   (0.1ms)  BEGIN
   (0.2ms)  ROLLBACK
Completed 500 Internal Server Error in 16ms (ActiveRecord: 7.9ms)



NoMethodError (undefined method `with_indifferent_access' for #<String:0x00007ffa0607b928>):

app/controllers/admin/lessons_controller.rb:41:in `update'

form.haml

%section
  .row
    .col-sm-6
      #graphic_upload
      #ProgressBar
      = f.fields_for :documents_attributes do |ff|
        = ff.hidden_field :graphic, class: "upload-hidden"

%script{:src => "https://transloadit.edgly.net/releases/uppy/v0.27.3/dist/uppy.min.js"}

:javascript
$R('#lesson_description', { plugins: ['video', 'alignment', 'counter'] });
function fileUpload(fileInput) {
  var uppy = Uppy.Core({ autoProceed: true })
    .use(Uppy.FileInput,   { target: '#graphic_upload',
                            pretty: true,
                            inputName: 'uploading_image',}) // adds a pretty file field
    .use(Uppy.ProgressBar, { target: "#ProgressBar" , fixed: false, hideAfterFinish: true}) // displays a progress bar
    .use(Uppy.Informer,    { /* ... */ }) // displays validation errors

  uppy.use(Uppy.AwsS3, {
    getUploadParameters: function (file) {
      return fetch('/presign?filename=' + file.name, {
          credentials: 'same-origin', // send cookies
        })
        .then(function (response) { return response.json() })
    }
  })
  uppy.on('upload-success', function (file, data, uploadURL) {
  var uploadedFileData = JSON.stringify({
    id: uploadURL.match(/\/cache\/([^\?]+)/)[1], // extract key without prefix
    storage: 'cache',
    metadata: {
      size:      file.size,
      filename:  file.name,
      mime_type: file.type,
    }
  })

  // set hidden field value to the uploaded file data so that it's submitted with the form as the attachment

var hiddenInput = document.getElementById('lesson_documents_attributes_graphic')
    hiddenInput.value = uploadedFileData
})

  return uppy
}

document.querySelectorAll('#graphic_upload').forEach(function (fileInput) {
  fileUpload(fileInput)
})

lesson.rb

class Lesson < ApplicationRecord
  extend FriendlyId
  friendly_id :title, use: [:finders, :slugged]
  belongs_to :course
  
  has_many :documents, as: :documentable, dependent: :destroy
  accepts_nested_attributes_for :documents, update_only: true
  
  def should_generate_new_friendly_id?
    slug.blank? || title_changed?
  end
end

lessons_controller.rb

def lesson_params
  params.require(:lesson).permit(:course_id, :video_link, :title, :slug, :description, documents_attributes: [:graphic] )
end