Polymorphic association - undefined method `image_data'

[rss...@gmail.com]

Hello Everyone,

I am learning rails as I develop a prototype app. It has been a great journey so far, at least until I got into file uploads a few days ago.

Multiple models in the app need to save one or more images, so I decided to use polymorphic associations.

Until I understand how to use direct_upload for local storage (I struggle to find proper guidance on this that includes javascript), I decided to stick to a single image per model record.

I am getting the undefined method `image_data' when I submit the form. The Image Uploader is being called when the :image param is seen as confirmed by the creation of a cached file (STORE[cache] ImageUploader[:image] Client 1 file (0.03s)).

The error appears to occur when the model object is created.

I am not expert, but one reason I am thinking of is that Shrine is trying to access the image_data method in the client model, which is not available. I am saying this because the client object (but not the associated image record) saves successfully is I add "attr_accessor :image_data" in the client model file.

Thank you all in advance for your assistance.

Luca 

[Luca Rossi]

client.rb

class Client < ApplicationRecord

  belongs_to :business

  belongs_to :created_by, :class_name => "User"

  belongs_to :updated_by, :class_name => "User"

  has_one :location, through: :updated_by

  

  has_many :images, as: :imageable, dependent: :destroy

  accepts_nested_attributes_for :images, allow_destroy: true

  include ImageUploader[:image]

image.rb

class Image < ApplicationRecord

    belongs_to :imageable, polymorphic: true

end

clients_controller.rb

  def create

    # Add business, creator and location params from session. Also updated_by is saved with the creator id

    @client = Client.new(client_params.merge(:business_id => current_user.business_id, :created_by_id => current_user.id, :updated_by_id => current_user.id,))

    respond_to do |format|

      if @client.save

        format.html { redirect_to edit_client_path(@client), notice: 'New client successfully created.' }

        format.json { render :shot, status: :created, location: @client }

      else

        format.html { render :new }

        format.json { render json: @client.errors, status: :unprocessable_entity }

      end

    end

  end

[...]

    # Never trust parameters from the scary internet, only allow the white list through.

    def client_params

      params.require(:client).permit(:first_name, 

                                      :last_name, 

                                      :dob, 

                                      :sex, 

                                      :address, 

                                      :suburb, 

                                      :state, 

                                      :postcode, 

                                      :email, 

                                      :phone, 

                                      :agreement,

                                      :image,

                                      )

    end

[Luca Rossi]

https://stackoverflow.com/questions/38584189/error-validation-failed-images-imageable-must-exist-rails-5-0-paperclip-5

finally.. optional: true is the answer !

class Image < ApplicationRecord

    include ImageUploader[:image]

    belongs_to :imageable, polymorphic: true, optional: true

end