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README.markdown

ActivityFeed

Activity feeds backed by Redis. Activity feeds may also be referred to as timelines or news feeds.

Compatibility

The gem has been built and tested under Ruby 1.8.7 and Ruby 1.9.3.

Installation

gem install activity_feed

or:

gem 'activity_feed'

Make sure your redis server is running! Redis configuration is outside the scope of this README, but check out the Redis documentation.

Configuration

Basic configuration options

require 'activity_feed'

ActivityFeed.configure do |configuration|
  configuration.redis = Redis.new(:host => '127.0.0.1', :port => 6379)
  configuration.namespace = 'activity_feed'
  configuration.aggregate = false
  configuration.aggregate_key = 'aggregate'
  configuration.page_size = 25
end
  • redis: The Redis connection instance to be used.
  • namespace: Namespace to isolate ActivityFeed data in Redis.
  • aggregate: Determines whether or not, by default, various calls will pull from the aggregate activity feed for a user.
  • aggregate_key: Further isolates the aggregate ActivityFeed data.
  • page_size: Number of activity feed items to be retrieved per-page.

Advanced configuration options

  • items_loader: ActivityFeed supports loading items from your ORM (e.g. ActiveRecord) or your ODM (e.g. Mongoid) when a page for a user's activity feed is requested. This option should be set to a Proc that will be called passing the item IDs as its only argument.

NOTE: The following examples developing an activity feed with Mongoid using Mongoid 3.x.

For example:

Assume you have defined a class for storing your activity feed items in Mongoid as follows:

require 'mongoid'

module ActivityFeed
  module Mongoid
    class Item
      include ::Mongoid::Document
      include ::Mongoid::Timestamps

      field :user_id, type: String
      validates_presence_of :user_id

      field :nickname, type: String
      field :type, type: String
      field :title, type: String
      field :text, type: String
      field :url, type: String
      field :icon, type: String
      field :sticky, type: Boolean

      index({ user_id: 1 }

      after_save :update_item_in_activity_feed
      after_destroy :remove_item_from_activity_feed

      private

      def update_item_in_activity_feed
        ActivityFeed.update_item(self.user_id, self.id, self.updated_at.to_i)
      end

      def remove_item_from_activity_feed
        ActivityFeed.remove_item(self.user_id, self.id)
      end
    end
  end
end

You would add the following option where you are configuring ActivityFeed as follows:

ActivityFeed.items_loader = Proc.new { |ids| ActivityFeed::Mongoid::Item.where(:id.in => ids).order_by(updated_at: :desc).to_a }

If you need to handle any exceptions when loading activity feed items, please do this in the Proc.

Usage

Developing an Activity Feed for an Individual

Below is a complete example using Mongoid as our persistent storage for activity feed items. The example uses callbacks to update and remove items from the activity feed. As this example uses the updated_at time of the item, updated items will "bubble up" to the top of the activity feed.

# Configure Mongoid
require 'mongoid'

Mongoid.load!("/path/to/your/mongoid.yml", :production)

# Create a class for activity feed items
module ActivityFeed
  module Mongoid
    class Item
      include ::Mongoid::Document
      include ::Mongoid::Timestamps

      field :user_id, type: String
      validates_presence_of :user_id

      field :nickname, type: String
      field :type, type: String
      field :title, type: String
      field :text, type: String
      field :url, type: String
      field :icon, type: String
      field :sticky, type: Boolean

      index({ user_id: 1 }

      after_save :update_item_in_activity_feed
      after_destroy :remove_item_from_activity_feed

      private

      def update_item_in_activity_feed
        ActivityFeed.update_item(self.user_id, self.id, self.updated_at.to_i)
      end

      def remove_item_from_activity_feed
        ActivityFeed.remove_item(self.user_id, self.id)
      end
    end
  end
end

# Configure ActivityFeed
require 'activity_feed'

ActivityFeed.configure do |configuration|
  configuration.redis = Redis.new(:host => '127.0.0.1', :port => 6379)
  configuration.namespace = 'activity_feed'
  configuration.aggregate = false
  configuration.aggregate_key = 'aggregate'
  configuration.page_size = 25
  configuration.items_loader = Proc.new { |ids| ActivityFeed::Mongoid::Item.where(:id.in => ids).order_by(updated_at: :desc).to_a }
end

# Create a couple of activity feed items
activity_item_1 = ActivityFeed::Mongoid::Item.create(
  :user_id => 'david',
  :nickname => 'David Czarnecki',
  :type => 'some_activity',
  :title => 'Great activity',
  :text => 'This is text for the activity feed item',
  :url => 'http://url.com'
)

activity_item_2 = ActivityFeed::Mongoid::Item.create(
  :user_id => 'david',
  :nickname => 'David Czarnecki',
  :type => 'some_activity',
  :title => 'Another great activity',
  :text => 'This is some other text for the activity feed item',
  :url => 'http://url.com'
)

# Pull up the activity feed
feed = ActivityFeed.feed('david', 1)
 => [#<ActivityFeed::Mongoid::Item _id: 4fe0ce26421aa91fc2000004, _type: nil, created_at: 2012-06-19 19:08:22 UTC, updated_at: 2012-06-19 19:08:22 UTC, user_id: "david", nickname: "David Czarnecki", type: "some_activity", title: "Another great activity", text: "This is some other text for the activity feed item", url: "http://url.com", icon: nil, sticky: nil>, #<ActivityFeed::Mongoid::Item _id: 4fe0ce26421aa91fc2000003, _type: nil, created_at: 2012-06-19 19:08:22 UTC, updated_at: 2012-06-19 19:08:22 UTC, user_id: "david", nickname: "David Czarnecki", type: "some_activity", title: "Great activity", text: "This is text for the activity feed item", url: "http://url.com", icon: nil, sticky: nil>]

# Update an actitivity feed item
activity_item_1.text = 'Updated some text for the activity feed item'
activity_item_1.save

# Pull up the activity feed item and notice that the item you updated has "bubbled up" to the top of the feed
feed = ActivityFeed.feed('david', 1)
 => [#<ActivityFeed::Mongoid::Item _id: 4fe0ce26421aa91fc2000003, _type: nil, created_at: 2012-06-19 19:08:22 UTC, updated_at: 2012-06-19 19:11:27 UTC, user_id: "david", nickname: "David Czarnecki", type: "some_activity", title: "Great activity", text: "Updated some text for the activity feed item", url: "http://url.com", icon: nil, sticky: nil>, #<ActivityFeed::Mongoid::Item _id: 4fe0ce26421aa91fc2000004, _type: nil, created_at: 2012-06-19 19:08:22 UTC, updated_at: 2012-06-19 19:08:22 UTC, user_id: "david", nickname: "David Czarnecki", type: "some_activity", title: "Another great activity", text: "This is some other text for the activity feed item", url: "http://url.com", icon: nil, sticky: nil>]

Developing an Aggregate Activity Feed for an Individual

# Configure Mongoid
require 'mongoid'

Mongoid.load!("/path/to/your/mongoid.yml", :production)

# Create a class for activity feed items
module ActivityFeed
  module Mongoid
    class Item
      include ::Mongoid::Document
      include ::Mongoid::Timestamps

      field :user_id, type: String
      validates_presence_of :user_id

      field :text, type: String

      after_save :update_item_in_activity_feed
      after_destroy :remove_item_from_activity_feed

      private

      def update_item_in_activity_feed
        ActivityFeed.update_item(self.user_id, self.id, self.updated_at.to_i)
      end

      def remove_item_from_activity_feed
        ActivityFeed.remove_item(self.user_id, self.id)
      end
    end
  end
end

# Configure ActivityFeed
require 'activity_feed'

ActivityFeed.configure do |configuration|
  configuration.redis = Redis.new(:host => '127.0.0.1', :port => 6379)
  configuration.namespace = 'activity_feed'
  configuration.aggregate = true
  configuration.aggregate_key = 'aggregate'
  configuration.page_size = 25
  configuration.items_loader = Proc.new { |ids| ActivityFeed::Mongoid::Item.where(:id.in => ids).order_by(updated_at: :desc).to_a }
end

# Create activity feed items for a couple of users and aggregate the activity feed items from the second user in the first user's activity feed
1.upto(5) do |index|
  ActivityFeed::Mongoid::Item.create(
    :user_id => 'david',
    :text => "This is from david's activity feed"
  )

  sleep(1) # Sleep a little so we make sure to have unique timestamps between activity feed items

  another_item = ActivityFeed::Mongoid::Item.create(
    :user_id => 'unknown',
    :text => "This is from unknown's activity feed"
  )

  sleep(1)

  ActivityFeed.aggregate_item('david', another_item.id, another_item.updated_at.to_i)
end

# Pull up the aggregate activity feed
pp feed = ActivityFeed.feed('david', 1, true)
  [#<ActivityFeed::Mongoid::Item _id: 4fe289248bb895b79500000a, _type: nil, created_at: 2012-06-21 02:38:28 UTC, updated_at: 2012-06-21 02:38:28 UTC, user_id: "unknown", text: "This is from unknown's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe289238bb895b795000009, _type: nil, created_at: 2012-06-21 02:38:27 UTC, updated_at: 2012-06-21 02:38:27 UTC, user_id: "david", text: "This is from david's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe289228bb895b795000008, _type: nil, created_at: 2012-06-21 02:38:26 UTC, updated_at: 2012-06-21 02:38:26 UTC, user_id: "unknown", text: "This is from unknown's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe289218bb895b795000007, _type: nil, created_at: 2012-06-21 02:38:25 UTC, updated_at: 2012-06-21 02:38:25 UTC, user_id: "david", text: "This is from david's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe289208bb895b795000006, _type: nil, created_at: 2012-06-21 02:38:24 UTC, updated_at: 2012-06-21 02:38:24 UTC, user_id: "unknown", text: "This is from unknown's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe2891f8bb895b795000005, _type: nil, created_at: 2012-06-21 02:38:23 UTC, updated_at: 2012-06-21 02:38:23 UTC, user_id: "david", text: "This is from david's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe2891e8bb895b795000004, _type: nil, created_at: 2012-06-21 02:38:22 UTC, updated_at: 2012-06-21 02:38:22 UTC, user_id: "unknown", text: "This is from unknown's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe2891d8bb895b795000003, _type: nil, created_at: 2012-06-21 02:38:21 UTC, updated_at: 2012-06-21 02:38:21 UTC, user_id: "david", text: "This is from david's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe2891c8bb895b795000002, _type: nil, created_at: 2012-06-21 02:38:20 UTC, updated_at: 2012-06-21 02:38:20 UTC, user_id: "unknown", text: "This is from unknown's activity feed">,
   #<ActivityFeed::Mongoid::Item _id: 4fe2891b8bb895b795000001, _type: nil, created_at: 2012-06-21 02:38:19 UTC, updated_at: 2012-06-21 02:38:19 UTC, user_id: "david", text: "This is from david's activity feed">]

ActivityFeed Caveats

ActivityFeed.remove_item can ONLY remove items from a single user's activity feed. If you allow activity feed items to be deleted from a user's activity feed, you will need to propagate that delete out to all the other feeds in which that activity feed item may have been aggregated.

ActivityFeed method summary

# Item-related

ActivityFeed.update_item(user_id, item_id, timestamp, aggregate = ActivityFeed.aggregate)
ActivityFeed.add_item(user_id, item_id, timestamp, aggregate = ActivityFeed.aggregate)

ActivityFeed.aggregate_item(user_id, item_id, timestamp)
ActivityFeed.remove_item(user_id, item_id)
ActivityFeed.check_item?(user_id, item_id, aggregate = ActivityFeed.aggregate)

# Feed-related

ActivityFeed.feed(user_id, page, aggregate = ActivityFeed.aggregate)
ActivityFeed.for(user_id, page, aggregate = ActivityFeed.aggregate)

ActivityFeed.full_feed(user_id, aggregate = ActivityFeed.aggregate)

ActivityFeed.feed_between_timestamps(user_id, starting_timestamp, ending_timestamp, aggregate = ActivityFeed.aggregate)
ActivityFeed.between(user_id, starting_timestamp, ending_timestamp, aggregate = ActivityFeed.aggregate)

ActivityFeed.total_pages_in_feed(user_id, aggregate = ActivityFeed.aggregate, page_size = ActivityFeed.page_size)
ActivityFeed.total_pages(user_id, aggregate = ActivityFeed.aggregate, page_size = ActivityFeed.page_size)

ActivityFeed.total_items_in_feed(user_id, aggregate = ActivityFeed.aggregate)
ActivityFeed.total_items(user_id, aggregate = ActivityFeed.aggregate)

ActivityFeed.trim_feed(user_id, starting_timestamp, ending_timestamp, aggregate = ActivityFeed.aggregate)
ActivityFeed.trim(user_id, starting_timestamp, ending_timestamp, aggregate = ActivityFeed.aggregate)

ActivityFeed.expire_feed(user_id, seconds, aggregate = ActivityFeed.aggregate)
ActivityFeed.expire_feed_in(user_id, seconds, aggregate = ActivityFeed.aggregate)
ActivityFeed.expire_in(user_id, seconds, aggregate = ActivityFeed.aggregate)

ActivityFeed.expire_feed_at(user_id, timestamp, aggregate = ActivityFeed.aggregate)
ActivityFeed.expire_at(user_id, timestamp, aggregate = ActivityFeed.aggregate)

ActivityFeed.remove_feeds(user_id)

Contributing to ActivityFeed

  • Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet
  • Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it
  • Fork the project
  • Start a feature/bugfix branch
  • Commit and push until you are happy with your contribution
  • Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
  • Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Copyright

Copyright (c) 2011-2104 David Czarnecki. See LICENSE.txt for further details.

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