Api upload

medical_record.rb

class MedicalRecord < ApplicationRecord
  enum kind: %i[ imaging results notes ]

  belongs_to :patient, class_name: "User", inverse_of: :medical_records

  has_one_attached :document, dependent: :detach

  scope :with_kind, -> (kind) { where kind: kind }

  after_create_commit :deliver_updation

  private
    def deliver_updation
      Deliveries::MedicalRecordUpdationDelivery.deliver(self, patient)
    end
end

medical_records_controller.rb

class Users::MedicalRecordsController < ApplicationProfessionalController
  include PatientScoped

  rescue_from ActiveSupport::MessageVerifier::InvalidSignature, with: :not_found

  def create
    if has_kind? && has_document?
      @medical_record = @patient.medical_records.create!(medical_record_params); render("medical_records/show", status: :created)
    else
      head :bad_request
    end
  end

  private
    def medical_record_params
      params.permit :kind, :document
    end

    def has_kind?
      MedicalRecord.kinds.keys.include?(params[:kind])
    end

    def has_document?
      params[:document].present?
    end
end

uploads_controller.rb

class UploadsController < ApplicationController
  def create
    if params[:name]
      @blob = upload(upload_params); render(json: response_attributes, status: :created)
    else
      head :bad_request
    end
  end

  private
    def upload(attributes)
      ActiveStorage::Blob.create_and_upload!(**attributes)
    end

    def upload_params
      { io: request.body, filename: params[:name] }
    end

    def response_attributes
      { attachable_sgid: @blob.signed_id }
    end
end

https://github.com/basecamp/bc3-api/blob/master/sections/uploads.md#create-an-upload