Remove the `text?` predicate from the type objects

This was only used for uniqueness validations. The first usage was in
conjunction with `limit`. Types which cast to string, but are not
considered text cannot have a limit. The second case was only with an
explicit `:case_sensitive => true` option given by the user.

1 files changed, 4 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index 04e28a0cfe..2a34969a8c 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -61,9 +61,11 @@ module ActiveRecord
 
         column = klass.columns_hash[attribute_name]
         value  = klass.connection.type_cast(value, column)
-        value  = value.to_s[0, column.limit] if value && column.limit && column.text?
+        if value.is_a?(String) && column.limit
+          value = value.to_s[0, column.limit]
+        end
 
-        if !options[:case_sensitive] && value && column.text?
+        if !options[:case_sensitive] && value.is_a?(String)
           # will use SQL LOWER function before comparison, unless it detects a case insensitive collation
           klass.connection.case_insensitive_comparison(table, attribute, column, value)
         else