Posts
has_many file attachments using Paperclip
16 Jun 2010
Tags:
gem, paperclip, has_many, multiple file attachments
I decided to use paperclip instead of attachment_fu for our new app. This is just a procedure on how to use paperclip with a has_many association.
We create two models: post and post_photo
plain
>> ruby script/generate model post title:text body:text >> ruby script/generate model post_photo post_id:integer
and associate them as follows.
ruby
class Post < ActiveRecord::Base has_many :post_photos end class PostPhoto < ActiveRecord::Base belongs_to :post has_atttached_file :photo end
Using paperclip's generator we create a migration to add columns to post_photo
plain
>> ruby script/generate paperclip post_photo photo
After that, create your views and controller methods. (Btw, I use haml for the views. I also like creating an associated record using virtual attributes. I also used the prototype based js, Builder, to create dom elements.)
haml
# Post#new.html.haml - form_for @post do |f| %label Title = f.text_field :post %label Body = f.text_area :body %label Photos = file_field_tag 'post[photo_attributes][]' #new_photos = link_to_function 'Add', 'add_file_field()' :javascript function add_file_field() { var div = Builder.new('div'); var file = Builder.new('input', {type:'file', name:'post[photo_attributes][]'}); var link = Builder.new('a', {onclick:'$("this").up().remove();}, 'Remove'); $('div').appendChild(file); $('div').appendChild(link); $('new_photos').appendChild(div);
ruby
# PostsController def create @post = Post.new(params[:post]) if @post.save flash[:notice] = 'Post saved' redirect_to @post else render :action => :new end end # post.rb def photo_attributes=(attribs) attribs.each do |attrib| post_photos.build :photo => attrib end end
