1 files changed, 50 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
new file mode 100644
index 0000000000..4e7d472d97
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
@@ -0,0 +1,50 @@
+module ActiveRecord
+  module ConnectionAdapters
+    module PostgreSQL
+      module OID # :nodoc:
+        class Array < Type::Value
+          attr_reader :subtype
+          delegate :type, to: :subtype
+
+          def initialize(subtype)
+            @subtype = subtype
+          end
+
+          def type_cast_from_database(value)
+            if value.is_a?(::String)
+              type_cast_array(parse_pg_array(value), :type_cast_from_database)
+            else
+              super
+            end
+          end
+
+          def type_cast_from_user(value)
+            type_cast_array(value, :type_cast_from_user)
+          end
+
+          # Loads pg_array_parser if available. String parsing can be
+          # performed quicker by a native extension, which will not create
+          # a large amount of Ruby objects that will need to be garbage
+          # collected. pg_array_parser has a C and Java extension
+          begin
+            require 'pg_array_parser'
+            include PgArrayParser
+          rescue LoadError
+            require 'active_record/connection_adapters/postgresql/array_parser'
+            include PostgreSQL::ArrayParser
+          end
+
+          private
+
+          def type_cast_array(value, method)
+            if value.is_a?(::Array)
+              value.map { |item| type_cast_array(item, method) }
+            else
+              @subtype.public_send(method, value)
+            end
+          end
+        end
+      end
+    end
+  end
+end