patch rails to ignore text limit

config/initializers/postgresql_limit_fix.rb

+if defined?(ActiveRecord::ConnectionAdapters::PostgreSQLAdapter)
+  class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
+    class TableDefinition
+      def text(*args)
+        options = args.extract_options!
+        options.delete(:limit)
+        column_names = args
+        type = :text
+        column_names.each { |name| column(name, type, options) }
+      end
+    end
+
+    def add_column_with_limit_filter(table_name, column_name, type, options = {})
+      options.delete(:limit) if type == :text
+      add_column_without_limit_filter(table_name, column_name, type, options)
+    end
+
+    def change_column_with_limit_filter(table_name, column_name, type, options = {})
+      options.delete(:limit) if type == :text
+      change_column_without_limit_filter(table_name, column_name, type, options)
+    end
+
+    alias_method_chain :add_column, :limit_filter
+    alias_method_chain :change_column, :limit_filter
+  end
+end