Default behavor for sqlserver 2000 is text type is text. Add class attribute accessor for setting this which tests do to varchar(8000) when tests are running on a 2000 DB version.

Author: metaskills

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -274,6 +274,8 @@ class SQLServerAdapter < AbstractAdapter
       SUPPORTED_VERSIONS      = [2000,2005].freeze
       LIMITABLE_TYPES         = [:string,:integer,:float].freeze
 
+      cattr_accessor :native_text_database_type
+      
       class << self
 
         def type_limitable?(type)
@@ -321,6 +323,10 @@ def sqlserver_2005?
         database_year == 2005
       end
 
+      def native_text_database_type
+        self.class.native_text_database_type || (sqlserver_2005? ? 'varchar(max)' : 'text')
+      end
+      
       # QUOTING ==================================================#
 
       def quote(value, column = nil)
@@ -468,12 +474,11 @@ def empty_insert_statement(table_name)
       # SCHEMA STATEMENTS ========================================#
 
       def native_database_types
-        text   = sqlserver_2005? ? "varchar(max)"   : "varchar(8000)"
         binary = sqlserver_2005? ? "varbinary(max)" : "image"
         {
           :primary_key => "int NOT NULL IDENTITY(1, 1) PRIMARY KEY",
           :string      => { :name => "varchar", :limit => 255  },
-          :text        => { :name =>  text },
+          :text        => { :name =>  native_text_database_type },
           :integer     => { :name => "int", :limit => 4 },
           :float       => { :name => "float", :limit => 8 },
           :decimal     => { :name => "decimal" },

test/cases/sqlserver_helper.rb

@@ -14,6 +14,14 @@
 
 class TableWithRealColumn < ActiveRecord::Base; end
 
+# Change the text database type to support ActiveRecord's tests for = on text columns which 
+# is not supported in SQL Server text columns, so use varchar(8000) instead.
+
+if ActiveRecord::Base.connection.sqlserver_2000?
+  ActiveRecord::ConnectionAdapters::SQLServerAdapter.native_text_database_type = 'varchar(8000)'
+end
+
+# Our changes/additions to ActiveRecord test helpers specific for SQL Server.
 
 ActiveRecord::Base.connection.class.class_eval do
   IGNORED_SQL << /SELECT SCOPE_IDENTITY/ << /INFORMATION_SCHEMA.TABLES/ << /INFORMATION_SCHEMA.COLUMNS/