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Polymorphic attachments with CarrierWave and nested_attributes
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class Attachment < ActiveRecord::Base | |
mount_uploader :attachment, AttachmentUploader | |
# Associations | |
belongs_to :attached_item, polymorphic: true | |
# Validations | |
validates_presence_of :attachment | |
validates_integrity_of :attachment | |
# Callbacks | |
before_save :update_attachment_attributes | |
# Delegate | |
delegate :url, :size, :path, to: :attachment | |
# Virtual attributes | |
alias_attribute :filename, :original_filename | |
private | |
def update_attachment_attributes | |
if attachment.present? && attachment_changed? | |
self.original_filename = attachment.file.original_filename | |
self.content_type = attachment.file.content_type | |
end | |
end | |
end |
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# encoding: utf-8 | |
require 'carrierwave/processing/mime_types' | |
class AttachmentUploader < CarrierWave::Uploader::Base | |
include CarrierWave::MimeTypes | |
storage :file | |
def store_dir | |
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}" | |
end | |
process :set_content_type | |
end |
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class AttachmentsController < ApplicationController | |
before_action :find_attachable | |
def create | |
@attachable.attachments.create attachment_params | |
redirect_to @attachable | |
end | |
private | |
def attachment_params | |
params.require(:attachment).permit(:attachment) | |
end | |
# could be improve and include into concerns | |
# http://api.rubyonrails.org/classes/ActiveSupport/Concern.html | |
def find_attachable | |
params.each do |name, value| | |
return @attachable = $1.classify.constantize.find(value) if name =~ /(.+)_id$/ | |
end | |
end | |
end |
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# Required gem ryanb/nested_form | |
# https://github.com/ryanb/nested_form | |
<%= nested_form_for @post, html: { multipart: true } do |f| %> | |
<p><%= f.link_to_add "Add an attachment", :attachments %></p> | |
<%= f.fields_for :attachments do |attachment_form| %> | |
<%= attachment_form.file_field :attachment %> | |
<%= attachment_form.hidden_field :attachment_cache %> | |
<%= attachment_form.link_to_remove "Remove this attachment" %> | |
<% end %> | |
<% end %> |
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class Post < ActiveRecord::Base | |
has_many :attachments, as: :attached_item, dependent: :destroy | |
# http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for | |
accepts_nested_attributes_for :attachments, allow_destroy: true, reject_if: proc { |attributes| attributes[:attachment].nil? } | |
end |
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class PostsController < ApplicationController | |
def new | |
@post = Post.new | |
end | |
def create | |
@post = Post.create post_params | |
redirect_to @post | |
end | |
private | |
def post_params | |
params.require(:post).permit(attachments_attributes: [:id, :attachment, :attachment_cache, :_destroy]) | |
end | |
end |
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App::Application.routes.draw do | |
# Concerns must be declared before | |
# http://api.rubyonrails.org/classes/ActionDispatch/Routing/Mapper/Concerns.html | |
concern :attachable do | |
resources :attachments, only: :create | |
end | |
resources :posts, concerns: [:attachable] | |
end |
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create_table "attachments", force: true do |t| | |
t.integer "attached_item_id" | |
t.string "attached_item_type" | |
t.string "attachment", null: false | |
t.string "original_filename" | |
t.string "content_type" | |
t.datetime "created_at" | |
t.datetime "updated_at" | |
end | |
add_index "attachments", ["attached_item_type", "attached_item_id"] |
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Works for me. My only challenge is I added a "Description" and "Order" to my attachments table. I'm trying to figure out how to 'edit' those fields with an edit view/update model without actually uploading a new image. (works if you update the image too)