Merge pull request #12 from ancorgs/master

JSON API for https://github.com/athanrous/suseconferenceclient

Gemfile

@@ -50,4 +50,5 @@ gem 'acts_as_commentable_with_threading'
 gem 'prawn'
 gem 'prawn_rails'
 gem 'gravtastic'
+gem 'active_model_serializers'
 

Gemfile.lock

@@ -15,6 +15,8 @@ GEM
       rack-cache (~> 1.2)
       rack-test (~> 0.6.1)
       sprockets (~> 2.2.1)
+    active_model_serializers (0.8.1)
+      activemodel (>= 3.0)
     activemodel (3.2.11)
       activesupport (= 3.2.11)
       builder (~> 3.0.0)
@@ -213,6 +215,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  active_model_serializers
   acts_as_commentable_with_threading
   bcrypt-ruby (~> 3.0.0)
   bootstrap-sass

app/controllers/api/base_controller.rb

@@ -0,0 +1,3 @@
+class Api::BaseController < ActionController::Base
+  protect_from_forgery
+end

app/controllers/api/v1/conferences_controller.rb

@@ -0,0 +1,7 @@
+class Api::V1::ConferencesController < Api::BaseController
+  respond_to :json
+
+  def index
+    render :json => Conference.all, :serializer => ConferencesArraySerializer
+  end
+end

app/controllers/api/v1/events_controller.rb

@@ -0,0 +1,11 @@
+class Api::V1::EventsController < Api::BaseController
+  respond_to :json
+
+  def index
+    events = Event.includes(:conference, :track, :room, :event_type, {:event_people => :person})
+    unless params[:conference_id].blank?
+      events = events.where("conferences.guid" => params[:conference_id])
+    end
+    respond_with events
+  end
+end

app/controllers/api/v1/rooms_controller.rb

@@ -0,0 +1,13 @@
+class Api::V1::RoomsController < Api::BaseController
+  respond_to :json
+
+  def index
+    if params[:conference_id].blank?
+      rooms = Room.all
+    else
+      conference = Conference.find_by_guid(params[:conference_id])
+      rooms = conference.rooms
+    end
+    respond_with rooms
+  end
+end

app/controllers/api/v1/speakers_controller.rb

@@ -0,0 +1,14 @@
+class Api::V1::SpeakersController < Api::BaseController
+  respond_to :json
+
+  def index
+    if params[:conference_id].blank?
+      people = Person.joins(:event_people)
+    else
+      people = Person.joins(:event_people => {:event => :conference})
+      people = people.where("conferences.guid" => params[:conference_id])
+    end
+    people = people.where("event_people.event_role" => "speaker")
+    render :json => people, :each_serializer => SpeakerSerializer
+  end
+end

app/controllers/api/v1/tracks_controller.rb

@@ -0,0 +1,13 @@
+class Api::V1::TracksController < Api::BaseController
+  respond_to :json
+
+  def index
+    if params[:conference_id].blank?
+      tracks = Track.all
+    else
+      tracks = Track.joins(:conference)
+      tracks = tracks.where("conferences.guid" => params[:conference_id])
+    end
+    respond_with tracks
+  end
+end

app/models/revision_observer.rb

@@ -0,0 +1,26 @@
+#
+# suseconferenceclient relies on a 'revision' attribute for caching and
+# doing some calculations.
+#
+# It should be incremented after any change in the conference or in any
+# associated models
+#
+# This observer updates the revision column in a non-intrusive way,
+# preventing validations, callbacks or exceptions to be triggered
+#
+# Relying on paper_trail could also be an option, but a 'revision' column
+# in table 'conferences' looks like a more simple and straightforward solution
+#
+class RevisionObserver < ActiveRecord::Observer
+  observe :conference, :event, :room, :social_event, :track
+
+  def after_save(model)
+    begin
+      conference = model.kind_of?(Conference) ? model : model.conference
+      conference.reload.increment(:revision)
+      conference.update_column(:revision, conference.revision)
+    rescue
+      nil
+    end
+  end
+end

app/serializers/conference_serializer.rb

@@ -0,0 +1,35 @@
+class ConferenceSerializer < ActiveModel::Serializer
+  attributes :guid, :name, :description, :year, :socialtag, :date_range, :url, :revision
+
+  def name
+    object.title
+  end
+
+  def year
+    object.start_date.try(:year)
+  end
+
+  def socialtag
+    object.social_tag
+  end
+
+  def revision
+    object.revision || 0
+  end
+
+  # FIXME: adjusting the format the DIRTY way, for oSC13.
+  # If you think this is ugly, don't look at the methods below
+  def date_range
+    object.date_range_string.try(:split, ",").try(:first)
+  end
+
+  # FIXME: just giving suseconferenceclient something to play with
+  def description
+    "openSUSE Conference 2013 - Power to the Geeko"
+  end
+
+  # FIXME: same than the former
+  def url
+    "https://conference.opensuse.org/"
+  end
+end

app/serializers/conferences_array_serializer.rb

@@ -0,0 +1,10 @@
+#
+# Needed in order to add the API version number to the conferences array
+#
+class ConferencesArraySerializer < ActiveModel::ArraySerializer
+
+  def as_json(*args)
+    json = super
+    json.merge!(:version => 1)
+  end
+end

app/serializers/event_serializer.rb

@@ -0,0 +1,41 @@
+class EventSerializer < ActiveModel::Serializer
+  include ActionView::Helpers::TextHelper
+
+  attributes :guid, :title, :length, :date, :language, :abstract,
+    :speaker_ids, :type, :room, :track
+
+  def date
+    object.start_time
+  end
+
+  def speaker_ids
+    speakers = object.event_people.select {|i| i.event_role == "speaker" }
+    speakers.map {|i| i.person.guid}
+  end
+
+  def type
+    object.event_type.try(:title)
+  end
+
+  def room
+    object.room.try(:guid)
+  end
+
+  def track
+    object.track.try(:guid)
+  end
+
+  def abstract
+    # This should never happen
+    if object.abstract.blank?
+      nil
+    else
+      simple_format(object.abstract).gsub("\n", "")
+    end
+  end
+
+  # FIXME: duplicated logic from Event#as_json
+  def length
+    object.event_type.try(:length) || 25
+  end
+end

app/serializers/room_serializer.rb

@@ -0,0 +1,8 @@
+class RoomSerializer < ActiveModel::Serializer
+  attributes :guid, :name, :description
+
+  # FIXME: just giving suseconferenceclient something to play with
+  def description
+    ""
+  end
+end

app/serializers/speaker_serializer.rb

@@ -0,0 +1,17 @@
+class SpeakerSerializer < ActiveModel::Serializer
+  include ActionView::Helpers::TextHelper
+
+  attributes :guid, :name, :company, :biography
+
+  def name
+    object.public_name
+  end
+
+  def biography
+    if object.biography.blank?
+      nil
+    else
+      simple_format(object.biography).gsub("\n", "")
+    end
+  end
+end

app/serializers/track_serializer.rb

@@ -0,0 +1,3 @@
+class TrackSerializer < ActiveModel::Serializer
+  attributes :guid, :name, :color
+end

config/application.rb

@@ -25,6 +25,7 @@ module Osem
 
     # Activate observers that should always be running.
     # config.active_record.observers = :cacher, :garbage_collector, :forum_observer
+    config.active_record.observers = :revision_observer
 
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.

config/routes.rb

@@ -53,6 +53,22 @@ Osem::Application.routes.draw do
       delete "/register" => "ConferenceRegistration#unregister"
     end
   end
+
+  namespace :api, defaults: {format: 'json'} do
+    namespace :v1 do
+      resources :conferences, :only => :index do
+        resources :rooms, :only => :index
+        resources :tracks, :only => :index
+        resources :speakers, :only => :index
+        resources :events, :only => :index
+      end
+      resources :rooms, :only => :index
+      resources :tracks, :only => :index
+      resources :speakers, :only => :index
+      resources :events, :only => :index
+    end
+  end
+
   match "/admin" => redirect("/admin/conference")
 
   root :to => "home#index"

db/migrate/20130705055128_add_revision_to_conference.rb

@@ -0,0 +1,5 @@
+class AddRevisionToConference < ActiveRecord::Migration
+  def change
+    add_column :conferences, :revision, :integer
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130626095459) do
+ActiveRecord::Schema.define(:version => 20130705055128) do
 
   create_table "call_for_papers", :force => true do |t|
     t.date     "start_date",    :null => false
@@ -62,6 +62,7 @@ ActiveRecord::Schema.define(:version => 20130626095459) do
     t.datetime "logo_updated_at"
     t.boolean  "use_dietary_choices",     :default => false
     t.boolean  "use_supporter_levels",    :default => false
+    t.integer  "revision"
   end
 
   create_table "dietary_choices", :force => true do |t|