#33 Add ability to let admin add css selector to grab content from page.

app/admin/post.rb

@@ -3,7 +3,7 @@ ActiveAdmin.register Post do
 # See permitted parameters documentation:
 # https://github.com/activeadmin/activeadmin/blob/master/docs/2-resource-customization.md#setting-up-strong-parameters
 #
-  permit_params :blocked, :processed, :good_format, :type
+  permit_params :blocked, :processed, :good_format, :type, :css_selector, :type, :url
 #
 # or
 #

app/models/article.rb

@@ -1,4 +1,14 @@
 class Article < Post
 
 
+  before_update :update_content
+
+  private
+
+  def update_content
+    if self.changed? && self.css_selector_changed?
+      PostContentWorker.perform_async self.id, self.url, self.css_selector
+    end
+  end
+
 end

app/workers/post_content_worker.rb

@@ -0,0 +1,15 @@
+class PostContentWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: :post, retry: 3
+
+  def perform id, url, css_selector
+    post = Post.find id
+    page = Nokogiri::HTML RestClient.get(url)
+    content_html = page.css(css_selector)[0].try(:to_html)
+    post.title = page.css("title").text if post.title.nil?
+    post.content = content_html
+    post.good_format = true if post.type != 'WebPage'
+    post.save!
+  end
+end

db/migrate/20151125153022_add_css_slector_to_article.rb

@@ -0,0 +1,5 @@
+class AddCssSlectorToArticle < ActiveRecord::Migration
+  def change
+    add_column :posts, :css_selector, :string, default: nil
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20151125145909) do
+ActiveRecord::Schema.define(version: 20151125153022) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -146,6 +146,7 @@ ActiveRecord::Schema.define(version: 20151125145909) do
     t.integer  "bookmarks_count", default: 0
     t.datetime "deleted_at"
     t.boolean  "blocked",         default: false
+    t.string   "css_selector"
   end
 
   add_index "posts", ["deleted_at"], name: "index_posts_on_deleted_at", using: :btree