Add a type object to Column constructor

Part of #15134. In order to perform typecasting polymorphically, we need
to add another argument to the constructor. The order was chosen to
match the `oid_type` on `PostgreSQLColumn`.

14 files changed, 86 insertions, 57 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 3b3b03ff6e..d9c939689f 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -3,6 +3,7 @@ require 'bigdecimal'
 require 'bigdecimal/util'
 require 'active_support/core_ext/benchmark'
 require 'active_record/connection_adapters/schema_cache'
+require 'active_record/connection_adapters/type'
 require 'active_record/connection_adapters/abstract/schema_dumper'
 require 'active_record/connection_adapters/abstract/schema_creation'
 require 'monitor'
@@ -362,6 +363,10 @@ module ActiveRecord
 
       protected
 
+      def lookup_cast_type(sql_type) # :nodoc:
+        Type::Value.new
+      end
+
       def translate_exception_class(e, sql)
         message = "#{e.class.name}: #{e.message}: #{sql}"
         @logger.error message if @logger
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 35045b5258..7074f69583 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -56,11 +56,11 @@ module ActiveRecord
       class Column < ConnectionAdapters::Column # :nodoc:
         attr_reader :collation, :strict, :extra
 
-        def initialize(name, default, sql_type = nil, null = true, collation = nil, strict = false, extra = "")
+        def initialize(name, default, cast_type, sql_type = nil, null = true, collation = nil, strict = false, extra = "")
           @strict    = strict
           @collation = collation
           @extra     = extra
-          super(name, default, sql_type, null)
+          super(name, default, cast_type, sql_type, null)
         end
 
         def extract_default(default)
@@ -263,8 +263,9 @@ module ActiveRecord
       end
 
       # Overridden by the adapters to instantiate their specific Column type.
-      def new_column(field, default, type, null, collation, extra = "") # :nodoc:
-        Column.new(field, default, type, null, collation, extra)
+      def new_column(field, default, sql_type, null, collation, extra = "") # :nodoc:
+        cast_type = lookup_cast_type(sql_type)
+        Column.new(field, default, cast_type, sql_type, null, collation, extra)
       end
 
       # Must return the Mysql error number from the exception, if the exception has an
diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index 38efebeaf3..3bab325e42 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -22,12 +22,14 @@ module ActiveRecord
       #
       # +name+ is the column's name, such as <tt>supplier_id</tt> in <tt>supplier_id int(11)</tt>.
       # +default+ is the type-casted default value, such as +new+ in <tt>sales_stage varchar(20) default 'new'</tt>.
+      # +cast_type+ is the object used for type casting and type information.
       # +sql_type+ is used to extract the column's length, if necessary. For example +60+ in
       # <tt>company_name varchar(60)</tt>.
       # It will be mapped to one of the standard Rails SQL types in the <tt>type</tt> attribute.
       # +null+ determines if this column allows +NULL+ values.
-      def initialize(name, default, sql_type = nil, null = true)
+      def initialize(name, default, cast_type, sql_type = nil, null = true)
         @name             = name
+        @cast_type        = cast_type
         @sql_type         = sql_type
         @null             = null
         @limit            = extract_limit(sql_type)
diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index 233af252d6..2e39168374 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -69,8 +69,9 @@ module ActiveRecord
         end
       end
 
-      def new_column(field, default, type, null, collation, extra = "") # :nodoc:
-        Column.new(field, default, type, null, collation, strict_mode?, extra)
+      def new_column(field, default, sql_type, null, collation, extra = "") # :nodoc:
+        cast_type = lookup_cast_type(sql_type)
+        Column.new(field, default, cast_type, sql_type, null, collation, strict_mode?, extra)
       end
 
       def error_number(exception)
diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index e6aa2ba921..69e2b0ab2b 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -156,8 +156,9 @@ module ActiveRecord
         end
       end
 
-      def new_column(field, default, type, null, collation, extra = "") # :nodoc:
-        Column.new(field, default, type, null, collation, strict_mode?, extra)
+      def new_column(field, default, sql_type, null, collation, extra = "") # :nodoc:
+        cast_type = lookup_cast_type(sql_type)
+        Column.new(field, default, cast_type, sql_type, null, collation, strict_mode?, extra)
       end
 
       def error_number(exception) # :nodoc:
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
index 97a93ce87a..77fdebbbc9 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
@@ -12,10 +12,10 @@ module ActiveRecord
 
         if sql_type =~ /\[\]$/
           @array = true
-          super(name, default_value, sql_type[0..sql_type.length - 3], null)
+          super(name, default_value, oid_type, sql_type[0..sql_type.length - 3], null)
         else
           @array = false
-          super(name, default_value, sql_type, null)
+          super(name, default_value, oid_type, sql_type, null)
         end
 
         @default_function = default if has_default_function?(default_value, default)
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
index 737f2daa63..0330fa762c 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
@@ -394,7 +394,9 @@ module ActiveRecord
             field["dflt_value"] = $1.gsub('""', '"')
           end
 
-          SQLite3Column.new(field['name'], field['dflt_value'], field['type'], field['notnull'].to_i == 0)
+          sql_type = field['type']
+          cast_type = lookup_cast_type(sql_type)
+          SQLite3Column.new(field['name'], field['dflt_value'], cast_type, sql_type, field['notnull'].to_i == 0)
         end
       end
 
diff --git a/activerecord/lib/active_record/connection_adapters/type.rb b/activerecord/lib/active_record/connection_adapters/type.rb
new file mode 100644
index 0000000000..1b27377cde
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/type.rb
@@ -0,0 +1,8 @@
+require 'active_record/connection_adapters/type/value'
+
+module ActiveRecord
+  module ConnectionAdapters
+    module Type # :nodoc:
+    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
new file mode 100644
index 0000000000..36f680050f
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/type/value.rb
@@ -0,0 +1,8 @@
+module ActiveRecord
+  module ConnectionAdapters
+    module Type
+      class Value # :nodoc:
+      end
+    end
+  end
+end
diff --git a/activerecord/test/active_record/connection_adapters/fake_adapter.rb b/activerecord/test/active_record/connection_adapters/fake_adapter.rb
index 59324c4857..64cde143a1 100644
--- a/activerecord/test/active_record/connection_adapters/fake_adapter.rb
+++ b/activerecord/test/active_record/connection_adapters/fake_adapter.rb
@@ -29,6 +29,7 @@ module ActiveRecord
         @columns[table_name] << ActiveRecord::ConnectionAdapters::Column.new(
           name.to_s,
           options[:default],
+          lookup_cast_type(sql_type.to_s),
           sql_type.to_s,
           options[:null])
       end
diff --git a/activerecord/test/cases/adapters/mysql/quoting_test.rb b/activerecord/test/cases/adapters/mysql/quoting_test.rb
index 3d1330efb8..f650e3fde8 100644
--- a/activerecord/test/cases/adapters/mysql/quoting_test.rb
+++ b/activerecord/test/cases/adapters/mysql/quoting_test.rb
@@ -9,13 +9,13 @@ module ActiveRecord
         end
 
         def test_type_cast_true
-          c = Column.new(nil, 1, 'boolean')
+          c = Column.new(nil, 1, Type::Value.new, 'boolean')
           assert_equal 1, @conn.type_cast(true, nil)
           assert_equal 1, @conn.type_cast(true, c)
         end
 
         def test_type_cast_false
-          c = Column.new(nil, 1, 'boolean')
+          c = Column.new(nil, 1, Type::Value.new, 'boolean')
           assert_equal 0, @conn.type_cast(false, nil)
           assert_equal 0, @conn.type_cast(false, c)
         end
diff --git a/activerecord/test/cases/adapters/sqlite3/quoting_test.rb b/activerecord/test/cases/adapters/sqlite3/quoting_test.rb
index e4b69fdf7b..63170e710e 100644
--- a/activerecord/test/cases/adapters/sqlite3/quoting_test.rb
+++ b/activerecord/test/cases/adapters/sqlite3/quoting_test.rb
@@ -47,13 +47,13 @@ module ActiveRecord
         end
 
         def test_type_cast_true
-          c = Column.new(nil, 1, 'int')
+          c = Column.new(nil, 1, Type::Value.new, 'int')
           assert_equal 't', @conn.type_cast(true, nil)
           assert_equal 1, @conn.type_cast(true, c)
         end
 
         def test_type_cast_false
-          c = Column.new(nil, 1, 'int')
+          c = Column.new(nil, 1, Type::Value.new, 'int')
           assert_equal 'f', @conn.type_cast(false, nil)
           assert_equal 0, @conn.type_cast(false, c)
         end
@@ -61,16 +61,16 @@ module ActiveRecord
         def test_type_cast_string
           assert_equal '10', @conn.type_cast('10', nil)
 
-          c = Column.new(nil, 1, 'int')
+          c = Column.new(nil, 1, Type::Value.new, 'int')
           assert_equal 10, @conn.type_cast('10', c)
 
-          c = Column.new(nil, 1, 'float')
+          c = Column.new(nil, 1, Type::Value.new, 'float')
           assert_equal 10.1, @conn.type_cast('10.1', c)
 
-          c = Column.new(nil, 1, 'binary')
+          c = Column.new(nil, 1, Type::Value.new, 'binary')
           assert_equal '10.1', @conn.type_cast('10.1', c)
 
-          c = Column.new(nil, 1, 'date')
+          c = Column.new(nil, 1, Type::Value.new, 'date')
           assert_equal '10.1', @conn.type_cast('10.1', c)
         end
 
diff --git a/activerecord/test/cases/column_definition_test.rb b/activerecord/test/cases/column_definition_test.rb
index c1dd1f1c69..33aba6421e 100644
--- a/activerecord/test/cases/column_definition_test.rb
+++ b/activerecord/test/cases/column_definition_test.rb
@@ -12,13 +12,13 @@ module ActiveRecord
       end
 
       def test_can_set_coder
-        column = Column.new("title", nil, "varchar(20)")
+        column = Column.new("title", nil, Type::Value.new, "varchar(20)")
         column.coder = YAML
         assert_equal YAML, column.coder
       end
 
       def test_encoded?
-        column = Column.new("title", nil, "varchar(20)")
+        column = Column.new("title", nil, Type::Value.new, "varchar(20)")
         assert !column.encoded?
 
         column.coder = YAML
@@ -26,7 +26,7 @@ module ActiveRecord
       end
 
       def test_type_case_coded_column
-        column = Column.new("title", nil, "varchar(20)")
+        column = Column.new("title", nil, Type::Value.new, "varchar(20)")
         column.coder = YAML
         assert_equal "hello", column.type_cast("--- hello")
       end
@@ -34,7 +34,7 @@ module ActiveRecord
       # Avoid column definitions in create table statements like:
       # `title` varchar(255) DEFAULT NULL
       def test_should_not_include_default_clause_when_default_is_null
-        column = Column.new("title", nil, "varchar(20)")
+        column = Column.new("title", nil, Type::Value.new, "varchar(20)")
         column_def = ColumnDefinition.new(
           column.name, "string",
           column.limit, column.precision, column.scale, column.default, column.null)
@@ -42,7 +42,7 @@ module ActiveRecord
       end
 
       def test_should_include_default_clause_when_default_is_present
-        column = Column.new("title", "Hello", "varchar(20)")
+        column = Column.new("title", "Hello", Type::Value.new, "varchar(20)")
         column_def = ColumnDefinition.new(
           column.name, "string",
           column.limit, column.precision, column.scale, column.default, column.null)
@@ -50,7 +50,7 @@ module ActiveRecord
       end
 
       def test_should_specify_not_null_if_null_option_is_false
-        column = Column.new("title", "Hello", "varchar(20)", false)
+        column = Column.new("title", "Hello", Type::Value.new, "varchar(20)", false)
         column_def = ColumnDefinition.new(
           column.name, "string",
           column.limit, column.precision, column.scale, column.default, column.null)
@@ -59,68 +59,68 @@ module ActiveRecord
 
       if current_adapter?(:MysqlAdapter)
         def test_should_set_default_for_mysql_binary_data_types
-          binary_column = MysqlAdapter::Column.new("title", "a", "binary(1)")
+          binary_column = MysqlAdapter::Column.new("title", "a", Type::Value.new, "binary(1)")
           assert_equal "a", binary_column.default
 
-          varbinary_column = MysqlAdapter::Column.new("title", "a", "varbinary(1)")
+          varbinary_column = MysqlAdapter::Column.new("title", "a", Type::Value.new, "varbinary(1)")
           assert_equal "a", varbinary_column.default
         end
 
         def test_should_not_set_default_for_blob_and_text_data_types
           assert_raise ArgumentError do
-            MysqlAdapter::Column.new("title", "a", "blob")
+            MysqlAdapter::Column.new("title", "a", Type::Value.new, "blob")
           end
 
           assert_raise ArgumentError do
-            MysqlAdapter::Column.new("title", "Hello", "text")
+            MysqlAdapter::Column.new("title", "Hello", Type::Value.new, "text")
           end
 
-          text_column = MysqlAdapter::Column.new("title", nil, "text")
+          text_column = MysqlAdapter::Column.new("title", nil, Type::Value.new, "text")
           assert_equal nil, text_column.default
 
-          not_null_text_column = MysqlAdapter::Column.new("title", nil, "text", false)
+          not_null_text_column = MysqlAdapter::Column.new("title", nil, Type::Value.new, "text", false)
           assert_equal "", not_null_text_column.default
         end
 
         def test_has_default_should_return_false_for_blob_and_text_data_types
-          blob_column = MysqlAdapter::Column.new("title", nil, "blob")
+          blob_column = MysqlAdapter::Column.new("title", nil, Type::Value.new, "blob")
           assert !blob_column.has_default?
 
-          text_column = MysqlAdapter::Column.new("title", nil, "text")
+          text_column = MysqlAdapter::Column.new("title", nil, Type::Value.new, "text")
           assert !text_column.has_default?
         end
       end
 
       if current_adapter?(:Mysql2Adapter)
         def test_should_set_default_for_mysql_binary_data_types
-          binary_column = Mysql2Adapter::Column.new("title", "a", "binary(1)")
+          binary_column = Mysql2Adapter::Column.new("title", "a", Type::Value.new, "binary(1)")
           assert_equal "a", binary_column.default
 
-          varbinary_column = Mysql2Adapter::Column.new("title", "a", "varbinary(1)")
+          varbinary_column = Mysql2Adapter::Column.new("title", "a", Type::Value.new, "varbinary(1)")
           assert_equal "a", varbinary_column.default
         end
 
         def test_should_not_set_default_for_blob_and_text_data_types
           assert_raise ArgumentError do
-            Mysql2Adapter::Column.new("title", "a", "blob")
+            Mysql2Adapter::Column.new("title", "a", Type::Value.new, "blob")
           end
 
           assert_raise ArgumentError do
-            Mysql2Adapter::Column.new("title", "Hello", "text")
+            Mysql2Adapter::Column.new("title", "Hello", Type::Value.new, "text")
           end
 
-          text_column = Mysql2Adapter::Column.new("title", nil, "text")
+          text_column = Mysql2Adapter::Column.new("title", nil, Type::Value.new, "text")
           assert_equal nil, text_column.default
 
-          not_null_text_column = Mysql2Adapter::Column.new("title", nil, "text", false)
+          not_null_text_column = Mysql2Adapter::Column.new("title", nil, Type::Value.new, "text", false)
           assert_equal "", not_null_text_column.default
         end
 
         def test_has_default_should_return_false_for_blob_and_text_data_types
-          blob_column = Mysql2Adapter::Column.new("title", nil, "blob")
+          blob_column = Mysql2Adapter::Column.new("title", nil, Type::Value.new, "blob")
           assert !blob_column.has_default?
 
-          text_column = Mysql2Adapter::Column.new("title", nil, "text")
+          text_column = Mysql2Adapter::Column.new("title", nil, Type::Value.new, "text")
           assert !text_column.has_default?
         end
       end
diff --git a/activerecord/test/cases/column_test.rb b/activerecord/test/cases/column_test.rb
index 39489c3718..c2135d75da 100644
--- a/activerecord/test/cases/column_test.rb
+++ b/activerecord/test/cases/column_test.rb
@@ -5,7 +5,7 @@ module ActiveRecord
   module ConnectionAdapters
     class ColumnTest < ActiveRecord::TestCase
       def test_type_cast_boolean
-        column = Column.new("field", nil, "boolean")
+        column = Column.new("field", nil, Type::Value.new, "boolean")
         assert column.type_cast('').nil?
         assert column.type_cast(nil).nil?
 
@@ -36,14 +36,14 @@ module ActiveRecord
       end
 
       def test_type_cast_string
-        column = Column.new("field", nil, "varchar")
+        column = Column.new("field", nil, Type::Value.new, "varchar")
         assert_equal "1", column.type_cast(true)
         assert_equal "0", column.type_cast(false)
         assert_equal "123", column.type_cast(123)
       end
 
       def test_type_cast_integer
-        column = Column.new("field", nil, "integer")
+        column = Column.new("field", nil, Type::Value.new, "integer")
         assert_equal 1, column.type_cast(1)
         assert_equal 1, column.type_cast('1')
         assert_equal 1, column.type_cast('1ignore')
@@ -56,50 +56,50 @@ module ActiveRecord
       end
 
       def test_type_cast_non_integer_to_integer
-        column = Column.new("field", nil, "integer")
+        column = Column.new("field", nil, Type::Value.new, "integer")
         assert_nil column.type_cast([1,2])
         assert_nil column.type_cast({1 => 2})
         assert_nil column.type_cast((1..2))
       end
 
       def test_type_cast_activerecord_to_integer
-        column = Column.new("field", nil, "integer")
+        column = Column.new("field", nil, Type::Value.new, "integer")
         firm = Firm.create(:name => 'Apple')
         assert_nil column.type_cast(firm)
       end
 
       def test_type_cast_object_without_to_i_to_integer
-        column = Column.new("field", nil, "integer")
+        column = Column.new("field", nil, Type::Value.new, "integer")
         assert_nil column.type_cast(Object.new)
       end
 
       def test_type_cast_nan_and_infinity_to_integer
-        column = Column.new("field", nil, "integer")
+        column = Column.new("field", nil, Type::Value.new, "integer")
         assert_nil column.type_cast(Float::NAN)
         assert_nil column.type_cast(1.0/0.0)
       end
 
       def test_type_cast_float
-        column = Column.new("field", nil, "float")
+        column = Column.new("field", nil, Type::Value.new, "float")
         assert_equal 1.0, column.type_cast("1")
       end
 
       def test_type_cast_decimal
-        column = Column.new("field", nil, "decimal")
+        column = Column.new("field", nil, Type::Value.new, "decimal")
         assert_equal BigDecimal.new("0"), column.type_cast(BigDecimal.new("0"))
         assert_equal BigDecimal.new("123"), column.type_cast(123.0)
         assert_equal BigDecimal.new("1"), column.type_cast(:"1")
       end
 
       def test_type_cast_binary
-        column = Column.new("field", nil, "binary")
+        column = Column.new("field", nil, Type::Value.new, "binary")
         assert_equal nil, column.type_cast(nil)
         assert_equal "1", column.type_cast("1")
         assert_equal 1, column.type_cast(1)
       end
 
       def test_type_cast_time
-        column = Column.new("field", nil, "time")
+        column = Column.new("field", nil, Type::Value.new, "time")
         assert_equal nil, column.type_cast(nil)
         assert_equal nil, column.type_cast('')
         assert_equal nil, column.type_cast('ABC')
@@ -109,7 +109,7 @@ module ActiveRecord
       end
 
       def test_type_cast_datetime_and_timestamp
-        [Column.new("field", nil, "datetime"), Column.new("field", nil, "timestamp")].each do |column|
+        [Column.new("field", nil, Type::Value.new, "datetime"), Column.new("field", nil, Type::Value.new, "timestamp")].each do |column|
           assert_equal nil, column.type_cast(nil)
           assert_equal nil, column.type_cast('')
           assert_equal nil, column.type_cast('  ')
@@ -121,7 +121,7 @@ module ActiveRecord
       end
 
       def test_type_cast_date
-        column = Column.new("field", nil, "date")
+        column = Column.new("field", nil, Type::Value.new, "date")
         assert_equal nil, column.type_cast(nil)
         assert_equal nil, column.type_cast('')
         assert_equal nil, column.type_cast(' ')
@@ -132,7 +132,7 @@ module ActiveRecord
       end
 
       def test_type_cast_duration_to_integer
-        column = Column.new("field", nil, "integer")
+        column = Column.new("field", nil, Type::Value.new, "integer")
         assert_equal 1800, column.type_cast(30.minutes)
         assert_equal 7200, column.type_cast(2.hours)
       end
@@ -147,7 +147,7 @@ module ActiveRecord
 
       if current_adapter?(:SQLite3Adapter)
         def test_binary_encoding
-          column = SQLite3Column.new("field", nil, "binary")
+          column = SQLite3Column.new("field", nil, Type::Value.new, "binary")
           utf8_string = "a string".encode(Encoding::UTF_8)
           type_cast = column.type_cast(utf8_string)