Why is paperclip upload giving Trying to link error? - ruby-on-rails

Question

So I have these files
deal.rb
class Deal < ApplicationRecord
has_many :images, as: :imageable, dependent: :destroy
#there is more code after this
end
image.rb
class Image < ApplicationRecord
belongs_to :imageable, polymorphic: true
belongs_to :deal
has_attached_file :attachment, styles: { thumb: "100x100!", medium: "200x200!" }
validates_attachment_content_type :attachment, content_type: /\Aimage\/.*\z/
end
deals_controller.rb
module Admins
class DealsController < BaseController
before_action :find_deal, only: [:edit, :update, :destroy]
def index
#deals = Deal.includes(:images)
end
def new
#deal = Deal.new
end
def edit
end
def create
#deal = Deal.new(deal_params.merge(created_by: current_user.id))
if #deal.save
flash[:success] = t('.success')
redirect_to admins_deals_url
else
flash.now[:warning] = t('.failure')
render :new
end
end
def update
if #deal.update(deal_params)
flash[:success] = t('.success')
redirect_to admins_deals_url
else
flash.now[:warning] = #deal.errors[:base].to_sentence
render :edit
end
end
def destroy
if #deal.destroy
flash[:success] = t('.success')
redirect_to admins_deals_url
else
flash.now[:warning] = t('.failure')
render :index
end
end
private
def deal_params
params.require(:deal).permit(:title, :description, :price, :discounted_price, :quantity, :publish_date, images_attributes: [:id, :attachment, :_destroy])
end
def find_deal
#deal = Deal.find_by(id: params[:id])
unless #deal
flash[:warning] = t('deals.not_found')
redirect_to admins_deals_path
end
end
end
end
application_controller.rb
class ApplicationController < ActionController::Base
helper_method :current_user, :current_cart
def current_user
#current_user ||= User.find_by(id: current_user_id)
end
def current_user_id
cookies.signed[:user_id] || session[:user_id]
end
def current_cart
#current_cart ||= (current_user.addressed_cart || current_user.cart) if current_user
end
end
EDIT:
Although I don't think application_controller has anything to do with the error
I am creating a deal with nested image attributes. I am using paperclip to upload the images. But I am getting these errors. I don't have any idea what the errors even mean. Here is an image to show the errors.
Here is the pastebin link
errors on terminal on creating deal

Answer 1

This appears to be a validation error. Try this for your validation:
validates_attachment_content_type :attachment, :content_type => /image/
Or for other variations you can see Validate Attachment Content Type Paperclip
UPDATE after testing your code seems this was a validation error because Paperclip creates an image but doesn't know about the belongs_to association. You can make it optional because by default rails 5 requires the belongs_to id field.
class Image < ApplicationRecord
belongs_to :imageable, polymorphic: true
belongs_to :deal, optional: true
has_attached_file :attachment, styles: { thumb: "100x100!", medium: "200x200!" }
validates_attachment_content_type :attachment, content_type: /\Aimage\/.*\z/
end