caike

# A user has many tweets.. and sometimes we want to retweet.

class TweetsController < ApplicationController

  def retweet
    @tweet = Tweet.find(params[:id])
    
    if @tweet.user == current_user
      flash[:notice] = "Sorry, you can't retweet your own tweets"
    elsif @tweet.retweets.where(:user_id => current_user.id).present?

caike

# Even when you create objects they should be properly scoped... Remember this example?

      t = Tweet.new
      t.status = "RT #{@tweet.user.name}: #{@tweet.status}"
      t.original_tweet = @tweet
      t.user = current_user
      t.save

# A simplified version of this, properly scoped might look like this:

caike

class AccountSetting < ActiveRecord::Base
  belongs_to :user

# attr_protected :user_id
# or you can also do

 attr_accessible  :public_email, :language, :time_zone,
                  :location_on_tweets, :show_media, :protect_tweets
  
end

caike

class AddIndexesToTables < ActiveRecord::Migration
  def self.up
    add_index :tweets, :user_id
    add_index :tweets, :tweet_id
    add_index :tweets, :created_at
    add_index :users, :email, :unique => true
    add_index :account_settings, :user_id
  end

caike

class Admin::TopicsController < ApplicationController

  # this could be an example of a before filter
  before_filter :check_security_token

  def create

    topic = Topic.new(params[:topic])

    # move this to AR callback before_create ?

caike

class AddDefaultTimeZoneToUsers < ActiveRecord::Migration
  def self.up
    change_column_default :account_settings, :time_zone, 'EST'
  end

  def self.down
    change_column :account_settings, :time_zone, :string, nil
  end
end

caike

<% @presenter.tweets.each do |tweet| %>
  <tr>
    <td><%= tweet.status %></td>
    <!--<td><%#= tweet.user.display_name %></td>-->
    <td><%= tweet.user %></td>
    <td><%= link_to 'Show', tweet %></td>
    <td><%= link_to 'Edit', edit_tweet_path(tweet) %></td>
    <td><%= link_to 'Destroy', tweet, :confirm => 'Are you sure?', :method => :delete %></td>
  </tr>
<% end %>

caike

class Topic < ActiveRecord::Base
  
  (...)

  def to_param
    "#{id}-#{name.parameterize}"
  end

  (...)

caike

class Topic < ActiveRecord::Base
  
  before_create :set_start_trending
  before_save :set_hot_topic, :if => Proc.new { |topic| topic.mentions >= HOT_TOPIC_MENTIONS }

  scope :trending_top, lambda { |num| where("started_trending > ?", 1.day.ago).order('mentions desc').limit(num) }

  HOT_TOPIC_MENTIONS = 1000

  def to_param

caike

class Topic < ActiveRecord::Base
  
  before_create :set_start_trending
  before_save :set_hot_topic, :if => Proc.new { |topic| topic.mentions >= HOT_TOPIC_MENTIONS }

  scope :trending_top, lambda { |num| where("started_trending > ?", 1.day.ago).order('mentions desc').limit(num) }

  HOT_TOPIC_MENTIONS = 1000

  validate :appropriate_content