book gallery

books_controller.rb

class BooksController < ApplicationController
  
  def show
    @gallery = @book.gallery
  end
  def new
    @book = Book.new
    @author = Author.new
    @school = School.new
    @book.build_author
    @gallery = @book.build_gallery
    @gallery.images.build
    @book.schools.build
  end
  def create
    @book = Book.create(book_params)
  end

private
def book_params
  params.require(:book).permit(:title, :synopsis, :body, :age, :publisher, :jacket_cover, :story_id, :author_id, :gallery_id, :school, schools_attributes: [:id, :school, :address, :school_name, :website, :_destroy], author_attributes: [:name,:biography], gallery_attributes: [:name, :book_id, images: [:file] ] )
end

end

form.html.erb

<%= f.simple_fields_for :gallery do |builder| %>
    <%= builder.input :name %>
    <%= render 'galleries/form', :f => builder %>
<% end %>

gallery_form.html.erb

  <div class="inputs">
    <h3>Create image gallery here, add multiple images one after the other.</h3>
      <%= f.simple_fields_for :images, :wrapper => 'inline' do |builder| %>
        <%= render 'image_fields', :f => builder %>
        <%= link_to_add_association 'add image', f, :images, :render_options => {:wrapper => 'inline' }, :class => 'fa fa-plus' %>
      <% end %>
  </div>

# Quick breakdown here: the images are added into the gallery via 'cocoon' gem which assigns them as an array in images_attributes 
# as you will see beolow in the params

models.rb

#book.rb
class Book < ActiveRecord::Base
  belongs_to :author
	belongs_to :gallery
	has_many :stories
	has_many :images

	accepts_nested_attributes_for :gallery
	accepts_nested_attributes_for :images
end
#gallery.rb
class Gallery < ActiveRecord::Base

	belongs_to :books
	has_many :images
	accepts_nested_attributes_for :books
	accepts_nested_attributes_for :images, :allow_destroy => true

end
#image.rb
class Image < ActiveRecord::Base

	belongs_to :gallery

	has_attached_file :file, :styles => { :medium => "300x300>", :thumb => "100x100>" }, :default_url => "/images/:style/missing.png"
	validates_attachment_content_type :file, :content_type => /\Aimage\/.*\Z/

end

params

"gallery_attributes"=>{
"name"=>"a gallery", 
"images_attributes"=>{
  "1412075384129"=>{
    "file"=>#<ActionDispatch::Http::UploadedFile:0x00000105a92670 @tempfile=#<File:/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/RackMultipart20140930-38960-71z5zd>, @original_filename="BmYbsf3CYAAxVJG.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"book[gallery_attributes][images_attributes][1412075384129][file]\"; filename=\"BmYbsf3CYAAxVJG.jpg\"\r\nContent-Type: image/jpeg\r\n">
    }, 
  "0"=>{"file"=>#<ActionDispatch::Http::UploadedFile:0x00000105a91fb8 @tempfile=#<File:/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/RackMultipart20140930-38960-1gel0jz>, @original_filename="46246205_1caa2bcb16_o.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"book[gallery_attributes][images_attributes][0][file]\"; filename=\"46246205_1caa2bcb16_o.jpg\"\r\nContent-Type: image/jpeg\r\n">
  }
}