Detect duplicate meetup events in DataFileValidator (#742)

* Detect duplicate meetup events in `DataFileValidator`

* Use actual count

Author: marcoroth

Rakefile

@@ -71,6 +71,7 @@ task :verify_meetups do
   events = validator.events
   dates = events.map { |event| event["start_date"] }
   exit 5 unless dates.sort == dates
+  exit 6 if validator.duplicate_events?
 end
 
 task :fetch_meetups do

_data/meetups.yml

@@ -1549,27 +1549,13 @@
   end_time: 20:00:00 EAT
   url: https://www.meetup.com/african_ruby_community/events/301578297
 
-- name: Columbus Ruby Brigade - Monthly Meetup September 2024
-  location: Columbus, OH
-  date: 2024-09-16
-  start_time: 18:00:00 EDT
-  end_time: 20:00:00 EDT
-  url: https://www.meetup.com/columbusrb/events/xwwkltygcmbvb
-
 - name: Columbus Ruby Brigade - Monthly Meetup September 2024
   location: Columbus, OH
   date: 2024-09-16
   start_time: 18:00:00 EDT
   end_time: 20:00:00 EDT
   url: https://www.meetup.com/columbusrb/events/303084093
 
-- name: Miami Ruby Brigade - September 2024
-  location: Coral Gables, FL
-  date: 2024-09-16
-  start_time: 19:00:00 EDT
-  end_time: 21:00:00 EDT
-  url: https://www.meetup.com/miamirb/events/pdvctsygcmbvb
-
 - name: Miami Ruby Brigade - September 2024
   location: Coral Gables, FL
   date: 2024-09-16

src/data_file_validator.rb

@@ -27,6 +27,17 @@ def validate
         @bonus_keys_error = true
       end
     end
+
+    if @type == :meetup
+      event_groups_by_date = events.map { |event| [event["name"].split(" - ").first, event["date"]] }
+
+      duplicate_events = event_groups_by_date.tally.select { |group, count| count > 1 }
+
+      duplicate_events.each do |(group, date), count|
+        @duplicate_events_error = true
+        puts "Meetup Group '#{group}' has #{count} events on #{date.iso8601}"
+      end
+    end
   end
 
   def missing_keys?
@@ -37,6 +48,10 @@ def bonus_keys?
     @bonus_keys_error
   end
 
+  def duplicate_events?
+    @duplicate_events_error
+  end
+
   private
 
   def required_keys(type = @type)