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.

4 files changed, 4 insertions, 14 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb
index b2a42e9ebb..2d2fede4e8 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb
@@ -8,10 +8,6 @@ module ActiveRecord
           def initialize(type)
             @type = type
           end
-
-          def text?
-            false
-          end
         end
       end
     end
diff --git a/activerecord/lib/active_record/type/string.rb b/activerecord/lib/active_record/type/string.rb
index e1791169d8..150defb106 100644
--- a/activerecord/lib/active_record/type/string.rb
+++ b/activerecord/lib/active_record/type/string.rb
@@ -5,10 +5,6 @@ module ActiveRecord
         :string
       end
 
-      def text?
-        true
-      end
-
       def changed_in_place?(raw_old_value, new_value)
         if new_value.is_a?(::String)
           raw_old_value != new_value
diff --git a/activerecord/lib/active_record/type/value.rb b/activerecord/lib/active_record/type/value.rb
index 081da7547e..e0a783fb45 100644
--- a/activerecord/lib/active_record/type/value.rb
+++ b/activerecord/lib/active_record/type/value.rb
@@ -50,10 +50,6 @@ module ActiveRecord
 
       # These predicates are not documented, as I need to look further into
       # their use, and see if they can be removed entirely.
-      def text? # :nodoc:
-        false
-      end
-
       def number? # :nodoc:
         false
       end
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