Ruby on Rails - Image Upload - ruby-on-rails

Question

I'd like to add images to a model. I have Users set up with Devise and they have_many Items that they are selling.
I would now like to add an array of images to the Item model (not sure if this is the best approach).
I have looked a Paperclip but can only do one image. Also looked at carrier wave but not sure how to implement on existing model.
Here is some of my code.
Item.rb
class Item < ActiveRecord::Base
belongs_to :user
validates :title, presence: true
validates :price, presence: true
validates :description, presence: true
end
items_controller.rb
class ItemsController < ApplicationController
before_action :findItem, only: [:edit, :update, :sold]
def index
#items = Item.all
end
def new
#item = Item.new
end
def create
#item = Item.create(item_params)
#item.user = current_user
if #item.save
flash[:success] = "Your item was successfully listed."
render 'show'
else
flash[:error] = "Your item could not be listed. Please try again."
render 'new'
end
end
def show
#item = Item.find(params[:id])
end
def edit
end
def update
if #item.update(item_params)
flash[:success] = "Your item listing was updated successfully."
redirect_to item_path(#item)
else
flash[:error] = "Your listing was not updated. Please try again."
render 'edit'
end
end
def sold
#item.toggle(:sold)
#item.save
redirect_to item_path(#item)
end
private
def item_params
params.require(:item).permit(:title, :price, :description)
end
def findItem
#item = Item.find(params[:id])
end
end
Form for Item/new.html.erb
<div class="row">
<div class="col-xs-12">
<%= form_for(#item, :html => {class: "form-horizontal", role: "form"}) do |f| %>
<div class="form-group">
<div class="control-label col-sm-2">
<%= f.label :title %>
</div>
<div class="col-sm-8">
<%= f.text_field :title, class: "form-control", placeholder: "What are you selling?", autofocus: true %>
</div>
</div>
<div class="form-group">
<div class="control-label col-sm-2">
<%= f.label :price %>
</div>
<div class="col-sm-8">
<%= f.number_field :price, class: "form-control" %>
</div>
</div>
<div class="form-group">
<div class="control-label col-sm-2">
<%= f.label :description %>
</div>
<div class="col-sm-8">
<%= f.text_area :description, rows: 10, class: "form-control", placeholder: "Describe your item. The more detail you include, the more likely it is to sell." %>
</div>
</div>
<div class="form-group">
<div class="center col-sm-offset-1 col-sm-10">
<%= f.submit class: "btn btn-primary btn-lg" %>
</div>
</div>
<% end %>
<div class="center col-xs-4 col-xs-offset-4">
<%= link_to "[ Cancel and return to listing page ]", items_path %>
</div>

Answer 1

You simply want to create an Image model. And set the relation with Item as follows: Item has_many :images, and Image belongs_to :item.
But, yeah, paperclip is a good start.
EDIT: Oh, and welcome Rails, you will find a good community ready to help. You might also find useful to search for accepts_nested_attributes_for so you can have the images uploaded in your Item form and cocoon to dynamically add and remove images on the item's form.

Answer 2

#app/models/item.rb
class Item < ActiveRecord::Base
has_many :images
accepts_nested_attributes_for :images
validates :title, :price, :description, presence: true
end
#app/models/image.rb
class Image < ActiveRecord::Base
belongs_to :item
has_attached_file :picture
end
--
The above will allow you to create an Item, which will have any number of images that you want. You can pass the new images through accepts_nested_attributes_for:
#app/controllers/items_controller.rb
class ItemsController < ApplicationController
def new
#item = Item.new
#item.images.build
end
def create
#item = Item.new item_params
#item.save
end
private
def item_params
params.require(:item).permit(images_attributes: [:picture])
end
end
#app/views/items/new.html.erb
<%= form_for #item do |f| %>
<%= f.fields_for :images do |i| %>
<%= i.file_field :picture %>
<% end %>
<%= f.submit %>
<% end %>