Delegate `Column#type` to the injected type object

The decision to wrap type registrations in a proc was made for two
reasons.

1. Some cases need to make an additional decision based on the type
  (e.g. a `Decimal` with a 0 scale)
2. Aliased types are automatically updated if they type they point to is
  updated later. If a user or another adapter decides to change the
  object used for `decimal` columns, `numeric`, and `number` will
  automatically point to the new type, without having to track what
  types are aliased explicitly.

Everything else here should be pretty straightforward. PostgreSQL ranges
had to change slightly, since the `simplified_type` method is gone.

1 files changed, 5 insertions, 8 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
index a97c33ae6f..90bf6c6d1a 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
@@ -2,10 +2,7 @@ module ActiveRecord
   module ConnectionAdapters
     module PostgreSQL
       module OID # :nodoc:
-        class Type
-          def type; end
-          def simplified_type(sql_type); type end
-
+        class Type < Type::Value
           def infinity(options = {})
             ::Float::INFINITY * (options[:negative] ? -1 : 1)
           end
@@ -136,11 +133,11 @@ module ActiveRecord
         end
 
         class Range < Type
-          attr_reader :subtype
-          def simplified_type(sql_type); sql_type.to_sym end
+          attr_reader :subtype, :type
 
-          def initialize(subtype)
+          def initialize(subtype, type)
             @subtype = subtype
+            @type = type
           end
 
           def extract_bounds(value)
@@ -412,7 +409,7 @@ This is not reliable and will be removed in the future.
 
           def register_range_type(row)
             if subtype = @store[row['rngsubtype'].to_i]
-              register row['oid'], OID::Range.new(subtype)
+              register row['oid'], OID::Range.new(subtype, row['typname'].to_sym)
             end
           end