Not reading file on a Rails rake - ruby-on-rails

Question

I'm running Rails 4 on Windows, and trying to automate a population script. My populatepins.rake file is:
namespace :db do
desc "Fill database with sample data"
task populatepins: :environment do
User.all.each do |user|
puts "[DEBUG] uploading images for user #{user.id} of #{User.last.id}"
2.times do |n|
image = File.open(Dir.glob(File.join(Rails.root, 'testpics', '*')).sample) # sample picks one random
puts "[DEBUG] searching for FILE: #{File.absolute_path(image)}"
description = %w(cool awesome crazy wow adorable incredible).sample # %W converts to an array
puts "[DEBUG] past description: #{description}"
user.pins.create!(image: image, description: description)
puts "[DEBUG] endofloop"
end
end
end
end
However, when running the script I get loops with this error:
C:\Sites\code\testrails>rake db:populatepins
[DEBUG] uploading images for user 45 of 47
[DEBUG] searching for FILE: C:/Sites/code/testrails/testpics/_MG_5557.jpg
[DEBUG] past description: adorable
C:/RailsInstaller/Ruby1.9.3/bin/rake: No such file or directory - lsof -p 13752
C:/RailsInstaller/Ruby1.9.3/bin/rake: No such file or directory - lsof -p 13752
C:/RailsInstaller/Ruby1.9.3/bin/rake: No such file or directory - lsof -p 13752
C:/RailsInstaller/Ruby1.9.3/bin/rake: No such file or directory - lsof -p 13752
[DEBUG] endofloop
I thought it might be the '\' vs '/' path problem as per https://www.ruby-forum.com/topic/194682, but couldn't really figure out a solution that worked...
Any help will be much appreciated, thanks!
EDIT: here is what the model looks like (JLX is me commenting...)
class Pin < ActiveRecord::Base
has_attached_file :image, styles: { large: "640x480>", medium: "320x240>", thumb: "200x200#"} # Paperclip association
validates :description, presence: true #, length: { minimum: 10 }
validates :user_id, presence: true
validates_attachment :image, presence: true,
content_type: { content_type: ['image/jpeg', 'image/jpg', 'image/png', 'image/gif']},
size: {less_than: 5.megabytes}
# JLX link to users
belongs_to :user # can only have one user associated
# We are modifying the default getter/setter method created automatically when generating the image_url var
def image_remote_url=(url_value)
self.image = URI.parse(url_value) unless url_value.blank?
super # inherits the default method behaviour
end
end
And this is what the controller looks like:
class PinsController < ApplicationController
# JLX Devise method
before_action :authenticate_user!, except: [:index, :show]
before_action :set_pin_global, only: [:show]
before_action :set_pin_user, only: [:edit, :update, :destroy]
# GET /pins
# GET /pins.json
def index
##pins = Pin.all
#pins = Pin.order("created_at desc")
end
# GET /pins/1
# GET /pins/1.json
def show
end
# GET /pins/new
def new
##pin = Pin.new
#pin = current_user.pins.new
end
# GET /pins/1/edit
def edit
end
# POST /pins
# POST /pins.json
def create
##pin = Pin.new(pin_params)
#pin = current_user.pins.new(pin_params)
respond_to do |format|
if #pin.save
format.html { redirect_to #pin, notice: 'Pin was successfully created.' }
format.json { render action: 'show', status: :created, location: #pin }
else
format.html { render action: 'new' }
format.json { render json: #pin.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /pins/1
# PATCH/PUT /pins/1.json
def update
respond_to do |format|
if #pin.update(pin_params)
format.html { redirect_to #pin, notice: 'Pin was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #pin.errors, status: :unprocessable_entity }
end
end
end
# DELETE /pins/1
# DELETE /pins/1.json
def destroy
#pin.destroy
respond_to do |format|
format.html { redirect_to pins_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_pin_global
#pin = Pin.find(params[:id])
end
def set_pin_user
#pin = current_user.pins.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def pin_params
params.require(:pin).permit(:description, :image, :image_remote_url) # JLX added :image
end
end