Paperclip: "has an extension that does not match its content" error - ruby-on-rails

Question

I am just trying to do some really simple picture uploading using paperclip. I googled this issue and it seems like everyone else has much more complicated problem than simple uploads. Below are my models and controllers.
pin.rb
class Pin < ActiveRecord::Base
belongs_to :user
has_attached_file :image
validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/
# validates the description
validates :description, presence: true
validates :user_id, presence: true
# validates paperclip
validates_attachment :image, presence: true,
content_type: { content_type: ["image/jpeg", "image/jpg", "image/png", "image/gif"]},
size: { less_than: 5.megabytes }
end
pin_controller.rb
class PinsController < ApplicationController
#before_filer will authentiate users to make sure they are logged in before doing anything with the Pins, with the except of indexing the pins so non-logged on users can also see them
before_filter :authenticate_user!, except: [:index]
before_action :set_pin, only: [:show, :edit, :update, :destroy]
# GET /pins
# GET /pins.json
def index
#pins = Pin.all
end
# GET /pins/1
# GET /pins/1.json
def show
end
# GET /pins/new
def new
# associate #pin to the current user's id
#pin = current_user.pins.new
end
# GET /pins/1/edit
def edit
# makes sure no other user can mess without a proper user id
#pin = current_user.pins.find(params[:id])
end
# POST /pins
# POST /pins.json
def create
# associate #pin to current user's id
#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
# makes sure no other user can mess without a proper user id
#pin = current_user.pins.find(params[:id])
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
# makes sure no other user can mess without a proper user id
#pin = current_user.pins.find(params[:id])
#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
#pin = Pin.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)
end
end
Here are what I think might be wrong with my code.
First, I followed the One Month Rails Tutorial, but since I am watching the outdated Rails 3 series, I have to convert everything he teaches into Rails 4 by myself through research. I may have set up the strong parameters wrong in my pin.rb controller. I added :image attribute field to the pin_params method like so
params.require(:pin).permit(:description, :image)
is this the right way to add :image using strong parameters? In rails 3, he added :image within attr_accessible
Second, in the README for paperclip, it says I should run which convert and ultimately input this line in my config file
Paperclip.options[:command_path] = "/usr/local/bin/"
Since I am using a windows machine, this is what I got ultimately after looking answers for hours
Paperclip.options[:command_path] = "C:/Program Files/ImageMagick-6.8.9-Q16/"
does the above path looks relatively correct for windows?

Answer 1

I too use Windows and was getting this error. I found my answer here. From what I gather, Paperclip protects against spoofing by getting the server's OS to validate the file's MIME type. It does this by executing the following command:
file -b --mime <my_file_name.extension>
The trouble is, the standard Windows Command Line doesn't have the file command, so the spoofing check fails and Paperclip throws the error that you observed.
To resolve this issue:
Install File for Windows.
Edit your system's PATH variable so that it includes the "File for Windows" bin directory path. (For me, it was C:\Program Files (x86)\GnuWin32\bin.)
Restart your Command Line, Git Bash, or what have you because you edited your PATH variable.
Confirm that Windows Command Line now responds to the file command.
This method worked for me on Windows 8.1 with Paperclip 4.2.1.

Answer 2

In your pin.rb Delete this line
validates_attachment :image, presence: true,
content_type: { content_type: ["image/jpeg", "image/jpg", "image/png", "image/gif"]},
size: { less_than: 5.megabytes }
Because your already use
validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/
I also do One More Rails with the outdated videos,like you.
Check for errors from my project
Here is the link My GigHub Project Files
Good Luck!)