Implement track requests and add the track organizer role

About track requests:
Create migration that adds the fields submitter_id, state, and
cfp_active to Tracks
Add validations and the self_organized? method to the Track model
Create a new TracksController outide of the admin namespace
Create the relevant views for index, show, new and edit
Modify the admin views for tracks to include extra info for
self-organized tracks

About track organizers:
Create the role when a self-organized track is created
Define track organizer abilities
Modify the roles views and controller to handle the new role

The route for Roles#edit needs to have higher priority than the nested
routes for track roles, otherwise, the word edit in the url is matched
as a track with short_name edit

app/models/admin_ability.rb

@@ -70,6 +70,11 @@ class AdminAbility
     cannot :destroy, Venue do |venue|
       venue.conference.program.events.where.not(room_id: nil).any?
     end
+
+    # Prevent requests for tracks from being destroyed
+    cannot :destroy, Track do |track|
+      track.self_organized?
+    end
   end
 
   # Abilities for signed in users with roles
@@ -79,6 +84,7 @@ class AdminAbility
     signed_in_with_cfp_role(user) if user.has_role? :cfp, :any
     signed_in_with_info_desk_role(user) if user.has_role? :info_desk, :any
     signed_in_with_volunteers_coordinator_role(user) if user.has_role? :volunteers_coordinator, :any
+    signed_in_with_track_organizer_role(user) if user.has_role? :track_organizer, :any
     common_abilities_for_roles(user)
   end
 
@@ -100,6 +106,9 @@ class AdminAbility
     # ids of all the conferences for which the user has the 'organizer' role and
     # conferences that belong to organizations for which user is 'organization_admin'
     conf_ids = conf_ids_for_organization_admin.concat(Conference.with_role(:organizer, user).pluck(:id)).uniq
+    # ids of all the tracks that belong to the programs of the above conferences
+    track_ids = Track.joins(:program).where('programs.conference_id IN (?)', conf_ids).pluck(:id)
+
     can :manage, Resource, conference_id: conf_ids
     can [:read, :update, :destroy], Conference, id: conf_ids
     can :manage, Splashpage, conference_id: conf_ids
@@ -140,11 +149,12 @@ class AdminAbility
 
     # Abilities for Role (Conference resource)
     can [:index, :show], Role do |role|
-      role.resource_type == 'Conference'
+      role.resource_type == 'Conference' || role.resource_type == 'Track'
     end
 
     can [:edit, :update, :toggle_user], Role do |role|
-      role.resource_type == 'Conference' && (conf_ids.include? role.resource_id)
+      role.resource_type == 'Conference' && (conf_ids.include? role.resource_id) ||
+        role.resource_type == 'Track' && (track_ids.include? role.resource_id)
     end
 
     can [:index, :revert_object, :revert_attribute], PaperTrail::Version do |version|
@@ -178,7 +188,7 @@ class AdminAbility
 
     # Abilities for Role (Conference resource)
     can [:index, :show], Role do |role|
-      role.resource_type == 'Conference'
+      role.resource_type == 'Conference' || role.resource_type == 'Track'
     end
     # Can add or remove users from role, when user has that same role for the conference
     # Eg. If you are member of the CfP team, you can add more CfP team members (add users to the role 'CfP')
@@ -211,7 +221,7 @@ class AdminAbility
 
     # Abilities for Role (Conference resource)
     can [:index, :show], Role do |role|
-      role.resource_type == 'Conference'
+      role.resource_type == 'Conference' || role.resource_type == 'Track'
     end
     # Can add or remove users from role, when user has that same role for the conference
     # Eg. If you are member of the CfP team, you can add more CfP team members (add users to the role 'CfP')
@@ -234,7 +244,7 @@ class AdminAbility
 
     # Abilities for Role (Conference resource)
     can [:index, :show], Role do |role|
-      role.resource_type == 'Conference'
+      role.resource_type == 'Conference' || role.resource_type == 'Track'
     end
     # Can add or remove users from role, when user has that same role for the conference
     # Eg. If you are member of the CfP team, you can add more CfP team members (add users to the role 'CfP')
@@ -243,4 +253,34 @@ class AdminAbility
         (Conference.with_role(:volunteers_coordinator, user).pluck(:id).include? role.resource_id)
     end
   end
+
+  def signed_in_with_track_organizer_role(user)
+    # ids of all the conferences for which the user has the 'track organizer' role
+    conf_ids_for_track_organizer = Track.with_role(:track_organizer, user).joins(:program).pluck(:conference_id)
+    # ids of all the tracks for which the user has the 'track_organizer' role
+    track_ids_for_track_organizer = Track.with_role(:track_organizer, user).pluck(:id)
+
+    can :show, Conference do |conf|
+      conf_ids_for_track_organizer.include?(conf.id)
+    end
+
+    # Show Program in the admin sidebar
+    can :show, Program, conference_id: conf_ids_for_track_organizer
+
+    # Show Tracks in the admin sidebar
+    can :update, Track do |track|
+      track.new_record? && conf_ids_for_track_organizer.include?(track.program.conference_id)
+    end
+
+    can :manage, Track, id: track_ids_for_track_organizer
+
+    # Show Roles in the admin sidebar and allow authorization of the index action
+    can [:index, :show], Role do |role|
+      role.resource_type == 'Conference' || role.resource_type == 'Track'
+    end
+
+    can :toggle_user, Role do |role|
+      role.resource_type == 'Track' && track_ids_for_track_organizer.include?(role.resource_id)
+    end
+  end
 end

app/models/track.rb

@@ -1,6 +1,10 @@
 class Track < ActiveRecord::Base
   include RevisionCount
+
+  resourcify :roles, dependent: :delete_all
+
   belongs_to :program
+  belongs_to :submitter, class_name: 'User'
   has_many :events, dependent: :nullify
 
   has_paper_trail only: [:name, :description, :color], meta: { conference_id: :conference_id }
@@ -14,13 +18,27 @@ class Track < ActiveRecord::Base
             uniqueness: {
               scope: :program
             }
+  validates :state, presence: true, if: :self_organized?
+  validates :cfp_active, inclusion: { in: [true, false] }, if: :self_organized?
 
   before_validation :capitalize_color
 
+  after_create :create_organizer_role, if: :self_organized?
+
   def conference
     program.conference
   end
 
+  ##
+  # Checks if the track is self-organized
+  # ====Returns
+  # * +true+ -> If the track has a submitter
+  # * +false+ -> if the track doesn't have a submitter
+  def self_organized?
+    return true if submitter
+    false
+  end
+
   private
 
   def generate_guid
@@ -38,4 +56,10 @@ class Track < ActiveRecord::Base
   def conference_id
     program.conference_id
   end
+
+  ##
+  # Creates the role of the track organizer
+  def create_organizer_role
+    Role.where(name: 'track_organizer', resource: self).first_or_create(description: 'For the organizers of the Track')
+  end
 end

app/models/user.rb

@@ -55,6 +55,7 @@ class User < ActiveRecord::Base
   has_many :votes, dependent: :destroy
   has_many :voted_events, through: :votes, source: :events
   has_many :subscriptions, dependent: :destroy
+  has_many :tracks, foreign_key: 'submitter_id'
   accepts_nested_attributes_for :roles
 
   scope :admin, -> { where(is_admin: true) }