Feeds can be liked.

Author: Vesa Marttila

app/controllers/newsfeeds_controller.rb

@@ -2,4 +2,11 @@ class NewsfeedsController < ApplicationController
     def index
         @newsfeed = Newsfeed.find_latest(15)
     end
+
+    def update
+        newsfeed = Newsfeed.find(params[:id])
+        Newsfeed.create_liking(current_user, newsfeed)
+        flash[:notice] = "You just liked something!"
+        redirect_to newsfeeds_url
+    end
 end

app/models/like.rb

@@ -0,0 +1,4 @@
+class Like < ActiveRecord::Base
+    belongs_to :user
+    belongs_to :newsfeed
+end

app/models/newsfeed.rb

@@ -1,4 +1,11 @@
 class Newsfeed < ActiveRecord::Base
+    has_many :likes
+    has_many :liking_users, :through => :likes, :source => :user
+
+    def self.create_liking(user, newsfeed)
+        newsfeed.liking_users << user
+    end
+
     def self.user_registered(user)
         create :message => "User #{user.username} registered."
     end

app/models/user.rb

@@ -21,6 +21,8 @@ class User < ActiveRecord::Base
     has_many :courses_faileds
     has_many :failed_courses, :through => :courses_faileds, :source =>
         :course
+    has_many :likes
+    has_many :liked_feeds, :through => :likes, :source => :newsfeed
 
     after_create :update_newsfeed
 

app/views/newsfeeds/index.html.erb

@@ -1,5 +1,15 @@
 <h2>Newsfeed</h2>
 
 <% @newsfeed.each do |item| %>
-    <p><%= item.message %> <%= time_ago_in_words(item.created_at) %> ago</p>
+    <p><%= item.message %> <%= time_ago_in_words(item.created_at) %> ago
+    <% unless item.liking_users.include?(current_user) %>
+        <%= link_to 'Like', newsfeed_url(item), :method => :put %>
+    <% end %>
+    <% unless item.liking_users.empty? %>
+        Liked by: 
+        <% item.liking_users.each do |u| %>
+            <%= u.username %>
+        <% end %>
+    <% end %>
+    </p>
 <% end %>

db/migrate/20091211000141_create_likes.rb

@@ -0,0 +1,14 @@
+class CreateLikes < ActiveRecord::Migration
+    def self.up
+        create_table :likes do |t|
+            t.integer :user_id
+            t.integer :newsfeed_id
+
+            t.timestamps
+        end
+    end
+
+    def self.down
+        drop_table :likes
+    end
+end

db/schema.rb

@@ -9,7 +9,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20091210231225) do
+ActiveRecord::Schema.define(:version => 20091211000141) do
 
   create_table "categories", :force => true do |t|
     t.string   "name"
@@ -63,6 +63,13 @@
     t.datetime "updated_at"
   end
 
+  create_table "likes", :force => true do |t|
+    t.integer  "user_id"
+    t.integer  "newsfeed_id"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
   create_table "newsfeeds", :force => true do |t|
     t.text     "message"
     t.datetime "created_at"

test/fixtures/likes.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
+
+# one:
+#   column: value
+#
+# two:
+#   column: value

test/unit/like_test.rb

@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class LikeTest < ActiveSupport::TestCase
+  # Replace this with your real tests.
+  test "the truth" do
+    assert true
+  end
+end