如何通过Paperclip rails 4上传图像，文档文档和/或PDF文件

Question

I would like to enable users to upload Word Docs and PDF files to my rails application. My app is similar to a Pinterest app, users can create Pins where they attach a picture followed by a description (used Paperclip to attach the image to the Pin ).

Here is my Pins model:

class Pin < ActiveRecord::Base
    belongs_to :user
    has_attached_file :image, :styles => { :medium => "300x300>", :thumb => "100x100>" }
    validates_attachment :image, content_type: { content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"] }
    validates :image, presence: true

    end

My Pins controller:

class PinsController < ApplicationController
  before_action :set_pin, only: [:show, :edit, :update, :destroy]
  before_action :correct_user, only: [:edit, :update, :destroy]
  before_action :authenticate_user!, except: [:index, :show]

  def index
    @pins = Pin.all.order("created_at DESC").paginate(:page => params[:page], :per_page => 15)
  end

  def show
  end

  def new
    @pin = current_user.pins.build
  end

  def edit
  end

 def create
    @pin = current_user.pins.build(pin_params)
    if @pin.save
      redirect_to @pin, notice: 'Pin was successfully created.'
    else
      render action: 'new'
    end
  end

  def update
    if @pin.update(pin_params)
      redirect_to @pin, notice: 'Pin was successfully updated.'
    else
      render action: 'edit'
    end
  end

  def destroy
    @pin.destroy
    redirect_to pins_url
  end

  private

    def set_pin
      @pin = Pin.find(params[:id])
    end

    def correct_user
      @pin = current_user.pins.find_by(id: params[:id] )
      redirect_to pins_path, notice: "Not authorized to edit this Pin" if @pin.nil?
    end


    def pin_params
      params.require(:pin).permit(:description, :image)
    end
end

I wonder if I just need to create another has_attached_file method for the Word docs and PDFs files within my Pin model and then create a view for users to upload the file.

Answer 1

It depends...

If you want to attach an image AND a document you need to create another paperclip attribute for the document. On your model:

has_attached_file :image, :styles => { :medium => "300x300>", :thumb => "100x100>" }
validates_attachment :image, content_type: { content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"] }

has_attached_file :document
validates_attachment :document, :content_type => { :content_type => %w(application/pdf application/msword application/vnd.openxmlformats-officedocument.wordprocessingml.document) }

If you want to attach an image OR a document you can do the following:

has_attached_file :document
validates_attachment :document, :content_type => {:content_type => %w(image/jpeg image/jpg image/png application/pdf application/msword application/vnd.openxmlformats-officedocument.wordprocessingml.document)}

If you choose the first option you will need two file inputs on your view, with the second only one. It's not right or wrong on this. It depends what you want to do.