1 files changed, 20 insertions, 13 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb
index 5555a46b6b..84643d20da 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb
@@ -1,21 +1,28 @@
+# frozen_string_literal: true
+
 module ActiveRecord
   module ConnectionAdapters
     module PostgreSQL
-      module ColumnDumper # :nodoc:
-        # Adds +:array+ option to the default set
-        def prepare_column_options(column)
-          spec = super
-          spec[:array] = "true" if column.array?
-          spec
-        end
-
-        # Adds +:array+ as a valid migration key
-        def migration_keys
-          super + [:array]
-        end
-
+      class SchemaDumper < ConnectionAdapters::SchemaDumper # :nodoc:
         private
 
+          def extensions(stream)
+            extensions = @connection.extensions
+            if extensions.any?
+              stream.puts "  # These are extensions that must be enabled in order to support this database"
+              extensions.sort.each do |extension|
+                stream.puts "  enable_extension #{extension.inspect}"
+              end
+              stream.puts
+            end
+          end
+
+          def prepare_column_options(column)
+            spec = super
+            spec[:array] = "true" if column.array?
+            spec
+          end
+
           def default_primary_key?(column)
             schema_type(column) == :bigserial
           end