Fixing Migration crashes on MySQL/MariaDB & PostgreSQL

db/migrate/20130712072609_add_attended_to_registrations.rb

@@ -2,6 +2,6 @@
 
 class AddAttendedToRegistrations < ActiveRecord::Migration
   def change
-    add_column :registrations, :attended, :boolean, default: 0
+    add_column :registrations, :attended, :boolean, default: false
   end
 end

db/migrate/20130728055450_add_schedule_changes_to_call_for_papers.rb

@@ -2,6 +2,6 @@
 
 class AddScheduleChangesToCallForPapers < ActiveRecord::Migration
   def change
-    add_column :call_for_papers, :schedule_changes, :boolean, default: 0
+    add_column :call_for_papers, :schedule_changes, :boolean, default: false
   end
 end

db/migrate/20140623100942_create_visits.rb

@@ -2,8 +2,16 @@
 
 class CreateVisits < ActiveRecord::Migration
   def change
+    adapter_type = connection.adapter_name.downcase.to_sym
+
     create_table :visits do |t|
-      t.uuid :visitor_id
+      case adapter_type
+      when :postgresql
+        t.uuid :visitor_id
+      else
+        t.integer :visitor_id
+      end
+      
 
       # the rest are recommended but optional
       # simply remove the columns you don't want

db/migrate/20140623101032_create_ahoy_events.rb

@@ -2,8 +2,16 @@
 
 class CreateAhoyEvents < ActiveRecord::Migration
   def change
+    adapter_type = connection.adapter_name.downcase.to_sym
+
     create_table :ahoy_events  do |t|
-      t.uuid :visit_id
+      case adapter_type
+      when :postgresql
+        t.uuid :visit_id
+      else
+        t.integer :visit_id
+      end
+      
       # user
       t.integer :user_id
       # add t.string :user_type if polymorphic

db/migrate/20140821103643_split_ticket_price_in_price_and_currency.rb

@@ -6,7 +6,15 @@ class SplitTicketPriceInPriceAndCurrency < ActiveRecord::Migration
   end
 
   def change
-    add_money :tickets, :price
+    adapter_type = connection.adapter_name.downcase.to_sym
+    
+    case adapter_type
+    when :postgresql
+      add_monetize :tickets, :price
+    else
+      add_money :tickets, :price
+    end
+
 
     TempTicket.all.each do |ticket|
       # Replace currency symbol with ISO Code

db/migrate/20171118113113_change_visit_id_type_of_ahoy_events_to_integer.rb

@@ -2,6 +2,15 @@
 
 class ChangeVisitIdTypeOfAhoyEventsToInteger < ActiveRecord::Migration[5.0]
   def change
-    change_column :ahoy_events, :visit_id, :integer, limit: nil
+    adapter_type = connection.adapter_name.downcase.to_sym
+    
+    case adapter_type
+    when :postgresql
+      change_column :ahoy_events, :visit_id, :integer, limit: nil, using: "('x' || translate(left(visit_id::text, 18), '-', ''))::bit(32)::int"
+    else
+      change_column :ahoy_events, :visit_id, :integer, limit: nil
+    end
+
+    
   end
 end