Allow a type caster to be given to the `Arel::Table` object

This will allow most consuming code to avoid the deprecation introduced
in 008445d6fd5f825d9b445ac75a7be67f0f7ab52c. The only code which will be
affected is code that is building the `Arel::Table` object manually,
rather than calling `arel_table` on an Active Record class. Hopefully
this case will be rare enough that we don't need to introduce any
additional APIs to work around it.

1 files changed, 17 insertions, 4 deletions

diff --git a/lib/arel/table.rb b/lib/arel/table.rb
index 2c7a2b7f93..b4b4a861b8 100644
--- a/lib/arel/table.rb
+++ b/lib/arel/table.rb
@@ -11,18 +11,19 @@ module Arel
     # TableAlias and Table both have a #table_name which is the name of the underlying table
     alias :table_name :name
 
-    def initialize name, options = {}
+    def initialize(name, as: nil, type_caster: nil)
       @name    = name.to_s
       @columns = nil
       @aliases = []
+      @type_caster = type_caster
 
       # Sometime AR sends an :as parameter to table, to let the table know
       # that it is an Alias.  We may want to override new, and return a
       # TableAlias node?
-      @table_alias = options[:as]
-      if @table_alias.to_s == @name
-        @table_alias = nil
+      if as.to_s == @name
+        as = nil
       end
+      @table_alias = as
     end
 
     def alias name = "#{self.name}_2"
@@ -98,6 +99,18 @@ module Arel
     end
     alias :== :eql?
 
+    def type_cast_for_database(attribute_name, value)
+      type_caster.type_cast_for_database(attribute_name, value)
+    end
+
+    def able_to_type_cast?
+      !type_caster.nil?
+    end
+
+    protected
+
+    attr_reader :type_caster
+
     private
 
     def attributes_for columns