Visiting /organizations shows a map of the last event for every chapter

Gemfile.lock

@@ -40,7 +40,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.4.0)
     arel (6.0.3)
-    autoprefixer-rails (6.3.2)
+    autoprefixer-rails (6.3.3)
       execjs
       json
     awesome_print (1.6.1)
@@ -176,7 +176,7 @@ GEM
     multi_xml (0.5.5)
     multipart-post (2.0.0)
     nested_form (0.3.2)
-    newrelic_rpm (3.14.3.313)
+    newrelic_rpm (3.15.0.314)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
     nokogumbo (1.4.7)
@@ -270,7 +270,7 @@ GEM
       railties (>= 4.2.0, < 5.1)
     rspec-collection_matchers (1.1.2)
       rspec-expectations (>= 2.99.0.beta1)
-    rspec-core (3.4.2)
+    rspec-core (3.4.3)
       rspec-support (~> 3.4.0)
     rspec-expectations (3.4.0)
       diff-lcs (>= 1.2.0, < 2.0)
@@ -327,7 +327,7 @@ GEM
     uniform_notifier (1.9.0)
     warden (1.2.6)
       rack (>= 1.0)
-    webmock (1.22.6)
+    webmock (1.24.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff

app/assets/stylesheets/_base.scss

@@ -256,6 +256,10 @@ ul.bulleted {
   height: 300px;
 }
 
+.gmaps4rails_bigger_map {
+  height: 550px;
+}
+
 .location-display .gmaps4rails_map {
   width: 100%;
 }

app/controllers/organizations_controller.rb

@@ -0,0 +1,15 @@
+class OrganizationsController < ApplicationController
+  def index
+    skip_authorization
+    @organizations = Organization.all
+    chapter_last_event_ids = Event
+                               .published
+                               .select('max(id) as event_id, chapter_id')
+                               .group(:chapter_id)
+                               .map(&:event_id)
+    @chapter_locations = Event
+                           .includes(:location)
+                           .where(id: chapter_last_event_ids)
+                           .map(&:location)
+  end
+end

app/models/event.rb

@@ -363,11 +363,13 @@ def levels
   end
 
   def set_defaults
-    self.details ||= Event::DEFAULT_DETAILS['default_details.html']
-    self.student_details ||= Event::DEFAULT_DETAILS['default_student_details.html']
-    self.volunteer_details ||= Event::DEFAULT_DETAILS['default_volunteer_details.html']
-    self.survey_greeting ||= Event::DEFAULT_DETAILS['default_survey_greeting.html']
-    self.allowed_operating_system_ids ||= OperatingSystem.all.map(&:id)
+    if self.has_attribute?(:details)
+      self.details ||= Event::DEFAULT_DETAILS['default_details.html']
+      self.student_details ||= Event::DEFAULT_DETAILS['default_student_details.html']
+      self.volunteer_details ||= Event::DEFAULT_DETAILS['default_volunteer_details.html']
+      self.survey_greeting ||= Event::DEFAULT_DETAILS['default_survey_greeting.html']
+      self.allowed_operating_system_ids ||= OperatingSystem.all.map(&:id)
+    end
   end
 
   def association_for_role(role, waitlisted: false)

app/views/organizations/index.html.erb

@@ -0,0 +1 @@
+<%= render "shared/map", locations: @chapter_locations, map_class: 'gmaps4rails_bigger_map' %>

app/views/shared/_map.html.erb

@@ -1,4 +1,4 @@
-<div class="gmaps4rails_map" id="gmaps4rails_map"></div>
+<div class="<%= local_assigns[:map_class] || 'gmaps4rails_map' %>" id="gmaps4rails_map"></div>
 <%
   markers = Gmaps4rails.build_markers(locations) do |location, marker|
     marker.lat location.latitude

config/routes.rb

@@ -15,17 +15,21 @@
   resources :locations do
     patch :archive, on: :member
   end
+
   resources :chapters do
     resources :leaders, only: [:index, :create, :destroy], controller: 'chapters/leaders' do
       get :potential, on: :collection
     end
   end
+
   resources :regions do
     resources :leaders, only: [:index, :create, :destroy], controller: 'regions/leaders' do
       get :potential, on: :collection
     end
   end
 
+  resources :organizations, only: [:index]
+
   resources :events do
     resources :organizers, only: [:index, :create, :destroy] do
       get :potential, on: :collection