実例アプリで学ぶ“Railsらしさ”の基礎：Railsで目指せ、情熱エンジニア（6）（1/2 ページ）

    |-- controllers
    |   |-- items_controller.rb
    |   |-- pages_controller.rb
    |   `-- users_controller.rb
    |-- helpers
    |-- models
    |   |-- item.rb
    |   |-- tag.rb
    |   |-- tagging.rb
    |   `-- user.rb
    `-- views
        |-- devise
        |-- items
        |   `-- edit.html.haml
        |-- pages
        |   |-- about.html.haml
        |   `-- home.html.haml
        `-- users
            |-- index.html.haml
            |-- me.html.haml
            `-- show.html.haml

class Item < ActiveRecord::Base
  belongs_to :user
  has_many :taggings, :dependent => :destroy
  has_many :tags, :through => :taggings
 
  # let us do the url validation in the contorller
 
  attr_writer :tag_names
  after_save :assign_tags
 
  def tag_names
    @tag_names || tags.map(&:name).join(' ')
  end
 
private
  def assign_tags
    if @tag_names
      self.tags = @tag_names.split(/\s+/).map do |name|
        Tag.find_or_create_by_name(name)
      end
    end
  end
end

# let us do the url validation in the contorller

require 'open-uri'
require 'nkf'
require 'timeout'
require 'resolv-replace'
class ItemsController < ApplicationController
  before_filter :authorise_as_owner
 
  conf = APP_CONFIG["bitly"]
  @@bitly = Bitly.new(conf["username"], conf["apikey"])
 
  def create
    @user = User.find(params[:user_id])
    @item = @user.items.new(params[:item])
 
    if @item.url !~ /^(#{URI::regexp(%w(http https))})$/ then
      flash[:notice] = "Invalid URL!!"
      redirect_to user_recent_path(current_user.username)
      return
    end
 
    begin 
      Timeout::timeout(8){
        @doc = open(@item.url).read
      }
    rescue Timeout::Error
      flash[:notice] = "Timeout! Could not retrieve data from the URL!!"
      redirect_to user_recent_path(current_user.username)
      return
    end
 
    guess_date @item
    populate @item
 
    if @item.save
      flash[:notice] = "Created an item. Any changes?"
      redirect_to edit_user_item_path(current_user, @item)
    else
      render :action => 'new'
    end
  end
 
  def destroy
    @item = Item.find(params[:id])
    @item.destroy
    flash[:notice] = "Successfully destroyed an item."
    redirect_to user_recent_path(current_user.username)
  end
 
  def edit
    @item = Item.find(params[:id])
  end
 
  def update
    @item = Item.find(params[:id])
    populate_hatena @item
    populate_retweet @item
    if @item.update_attributes(params[:item])
      flash[:notice] = "Successfully updated item."
      redirect_to user_recent_path(current_user.username)
    else
      render :action => 'edit'
    end
  end
 
private
 
  def authorise_as_owner
    @user = User.find(params[:user_id])
    unless (user_signed_in? && @user == current_user)
      # You are not the owner of this item!
      flash[:notice] = "Oops, something went wrong!"
      redirect_to users_path
    end
  end
 
  def guess_date(item)
    if @doc =~ /(20\d{2}\/[01]?\d\/[012]?\d)/ then
      date = Date.strptime($1, "%Y/%m/%d")
    end
    if date then
      item.published_at = date
    else
      item.published_at = Time.now
    end
  end
 
  def populate(item)
    populate_title(item)
    populate_hatena(item)
    populate_retweet(item)
  end
  
  def populate_title(item)
    item.title = item.url
    @doc.match(/<title>([^<]+)<\/title>/) do |m|
      if m.size == 2 then 
        title = m[1]
        item.title = NKF.nkf("--utf8", title)
      end
    end
  end
  
  def populate_hatena(item)
    hatena_api = "http://api.b.st-hatena.com/entry.count?url="
    url = item.url
    num = open(hatena_api+url).read
    num = 0 if num == ""
    item.hatena = num
  end
 
  def populate_retweet(item)
    url = @@bitly.shorten(item.url)
    item.bitly_url = url.short_url
    item.retweet   = url.global_clicks
  end
 
end

if @item.url !~ /^(#{URI::regexp(%w(http https))})$/ then

rescue Timeout::Error

before_filter :authorise_as_owner

def populate(item)
  populate_title(item)
  populate_hatena(item)
  populate_retweet(item)
end