File uploading through paperclip in rails 3.x
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Paperclip is a file attachment gem for Rails that allows files to be easily attached and referenced in applications. It saves files to the file system, database, or cloud. The document provides steps to integrate Paperclip into a Rails app to allow image uploads for a user profile: 1) Install ImageMagick for processing, 2) Add Paperclip to the Gemfile and bundle, 3) Generate a migration to add image fields to users, 4) Configure has_attached_file in the user model, 5) Add a file upload field to the form, and 6) Display the uploaded image.
![File uploading through Paperclip in rails 3.x
Paperclip is an easy file attachment library for Rails applications. Attached files are saved to the
file system, database or cloud and referenced in the browser by an easily understandable
specification.
Here is an example to explain the image attachment for a user profile in an application. This
example narrates about saving the image in the file system. However, the images can be saved in
S3 bucket [Amazon Simple Storage Service, S3] or database.
Step#1
ImageMagick must be installed in the system and Paperclip must have access to it. ImageMagick
is a software suite to create, edit, compose, or convert bitmap images. It can read and write
images in a variety of formats. You can download it by visiting the following URL:
http://www.imagemagick.org/script/index.php
Step#2
Include the paperclip gem in your Gemfile
gem "paperclip"
Then run the bundler to install the gem
bundle install
Step#3
Add the fields for the image processing as below in your migration file](https://image.slidesharecdn.com/fileuploadingthroughpaperclipinrails3-x-130104073414-phpapp02/85/File-uploading-through-paperclip-in-rails-3-x-1-320.jpg)
File uploading through paperclip in rails 3.x
- 1. File uploading through Paperclip in rails 3.x Paperclip is an easy file attachment library for Rails applications. Attached files are saved to the file system, database or cloud and referenced in the browser by an easily understandable specification. Here is an example to explain the image attachment for a user profile in an application. This example narrates about saving the image in the file system. However, the images can be saved in S3 bucket [Amazon Simple Storage Service, S3] or database. Step#1 ImageMagick must be installed in the system and Paperclip must have access to it. ImageMagick is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats. You can download it by visiting the following URL: http://www.imagemagick.org/script/index.php Step#2 Include the paperclip gem in your Gemfile gem "paperclip" Then run the bundler to install the gem bundle install Step#3 Add the fields for the image processing as below in your migration file
- 2. class CreateUsers < ActiveRecord::Migration def change create_table :users do |t| t.string :name t.string :photo_file_name t.string :photo_content_type t.string :photo_file_size t.timestamps end end end Then run your migration files rake db:migrate Step#4 Modify the user model for cropping and save image in your system folder has_attached_file :photo, :styles => { :small => "150x150>" }, :url => "/system/:attachment/:id/:style/:basename.:extension", :path => ":rails_root/public/system/:attachment/:id/:style/:basename.:extension" Here you can specify the file path and the image size as per the requirement. Step#5 Modify your view file to upload an image <%= form_for :user,:url => {:action => "create"}, :html => { :multipart => true } do |f| %> <%= f.file_field :photo %> <% end %> Step#6 Write the following code to display the image of a user <%= image_tag @user.photo.url (:small)%>