diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index a718756b93a2c310309e6a478e596fccc79c0288..522fa57822cc1c7a4e604f5686c4c61b101bc083 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -69,15 +69,11 @@ def extract_default(default)
       end
 
       private
-        delegate :extract_scale, to: :cast_type
+        delegate :extract_scale, :extract_precision, to: :cast_type
 
         def extract_limit(sql_type)
           $1.to_i if sql_type =~ /\((.*)\)/
         end
-
-        def extract_precision(sql_type)
-          $2.to_i if sql_type =~ /^(numeric|decimal|number)\((\d+)(,\d+)?\)/i
-        end
     end
   end
   # :startdoc:
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
index 80c79642f3339ea580b3ef21e4ec4e0733effc2b..302eb8a114a21ea4e857119dfb27e48f1c82cd13 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
@@ -35,8 +35,6 @@ class << self
           require 'active_record/connection_adapters/postgresql/array_parser'
           include PostgreSQL::ArrayParser
         end
-
-        attr_accessor :money_precision
       end
       # :startdoc:
 
@@ -121,17 +119,6 @@ def extract_limit(sql_type)
           else super
           end
         end
-
-        # Extracts the precision from PostgreSQL-specific data types.
-        def extract_precision(sql_type)
-          if sql_type == 'money'
-            self.class.money_precision
-          elsif sql_type =~ /timestamp/i
-            $1.to_i if sql_type =~ /\((\d+)\)/
-          else
-            super
-          end
-        end
     end
   end
 end
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb
index 1e34c09c8813497fab38643d668b6c30730c6c5f..74e8f30457f732797184c69871aef7369d842a4f 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb
@@ -5,6 +5,8 @@ module OID # :nodoc:
         class Money < Type::Decimal
           include Infinity
 
+          class_attribute :precision
+
           def extract_scale(sql_type)
             2
           end
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 7d1fa0dd08df5724708bd9a542d545bf6322a409..b0cbccb7ba478fe0e4e7c4f9e93983654869f930 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -713,7 +713,7 @@ def connect
           # Money type has a fixed precision of 10 in PostgreSQL 8.2 and below, and as of
           # PostgreSQL 8.3 it has a fixed precision of 19. PostgreSQLColumn.extract_precision
           # should know about this but can't detect it there, so deal with it here.
-          PostgreSQLColumn.money_precision = (postgresql_version >= 80300) ? 19 : 10
+          OID::Money.precision = (postgresql_version >= 80300) ? 19 : 10
 
           configure_connection
         rescue ::PG::Error => error
diff --git a/activerecord/lib/active_record/connection_adapters/type/date_time.rb b/activerecord/lib/active_record/connection_adapters/type/date_time.rb
index c34f4c5a53a1c8f109ea19245bf9dddb2f33d467..43203a4cd4deb7e317b1ea04e7c2a4808fb4d1f9 100644
--- a/activerecord/lib/active_record/connection_adapters/type/date_time.rb
+++ b/activerecord/lib/active_record/connection_adapters/type/date_time.rb
@@ -8,6 +8,10 @@ def type
           :datetime
         end
 
+        def extract_precision(sql_type)
+          $1.to_i if sql_type =~ /\((\d+)\)/
+        end
+
         private
 
         def cast_value(string)
diff --git a/activerecord/lib/active_record/connection_adapters/type/numeric.rb b/activerecord/lib/active_record/connection_adapters/type/numeric.rb
index a3379831cb0b1a66d73bee5123ce831dac9c2fc3..15081daf8d14dae8b825bfe0a316b189b91572c5 100644
--- a/activerecord/lib/active_record/connection_adapters/type/numeric.rb
+++ b/activerecord/lib/active_record/connection_adapters/type/numeric.rb
@@ -14,6 +14,10 @@ def type_cast_for_write(value)
           else super
           end
         end
+
+        def extract_precision(sql_type)
+          $1.to_i if sql_type =~ /\((\d+)(,\d+)?\)/
+        end
       end
     end
   end
diff --git a/activerecord/lib/active_record/connection_adapters/type/value.rb b/activerecord/lib/active_record/connection_adapters/type/value.rb
index 52d9ed9bc0c9974ddcd53727e9142989cbdc3b79..6687c9a2a495168e759f53a238b82c4cd42d5250 100644
--- a/activerecord/lib/active_record/connection_adapters/type/value.rb
+++ b/activerecord/lib/active_record/connection_adapters/type/value.rb
@@ -3,8 +3,11 @@ module ConnectionAdapters
     module Type
       class Value # :nodoc:
         def type; end
+
         def extract_scale(sql_type); end
 
+        def extract_precision(sql_type); end
+
         def type_cast(value)
           cast_value(value) unless value.nil?
         end