scinote-web/app/controllers/tiny_mce_assets_controller.rb

class TinyMceAssetsController < ApplicationController
  before_action :find_object

  def create
    image = params.fetch(:file) { render_404 }
    tiny_img = TinyMceAsset.new(image: image,
                                reference: @obj,
                                team_id: current_team.id)
    if tiny_img.save
      render json: {
        image: {
          url: view_context.image_url(tiny_img.url(:large)),
          token: Base62.encode(tiny_img.id)
        }
      }, content_type: 'text/html'
    else
      render json: {
        error: tiny_img.errors.full_messages
      }, status: :unprocessable_entity
    end
  end

  private

  def find_object
    obj_type = params.fetch(:object_type) { render_404 }
    obj_id = params.fetch(:object_id) { render_404 }
    render_404 unless %w(step result_text).include? obj_type
    @obj = obj_type.classify.constantize.find_by_id(obj_id)
  end
end