`only_integer` of `NumericalityValidator` now allows procs and symbols

1 files changed, 13 insertions, 1 deletions

diff --git a/activemodel/lib/active_model/validations/numericality.rb b/activemodel/lib/active_model/validations/numericality.rb
index a9fb9804d4..5bd162433d 100644
--- a/activemodel/lib/active_model/validations/numericality.rb
+++ b/activemodel/lib/active_model/validations/numericality.rb
@@ -30,7 +30,7 @@ module ActiveModel
           return
         end
 
-        if options[:only_integer]
+        if allow_only_integer?(record)
           unless value = parse_raw_value_as_an_integer(raw_value)
             record.errors.add(attr_name, :not_an_integer, filtered_options(raw_value))
             return
@@ -75,6 +75,17 @@ module ActiveModel
         filtered[:value] = value
         filtered
       end
+
+      def allow_only_integer?(record)
+        case options[:only_integer]
+        when Symbol
+          record.send(options[:only_integer])
+        when Proc
+          options[:only_integer].call(record)
+        else
+          options[:only_integer]
+        end
+      end
     end
 
     module HelperMethods
@@ -121,6 +132,7 @@ module ActiveModel
       # * <tt>:equal_to</tt>
       # * <tt>:less_than</tt>
       # * <tt>:less_than_or_equal_to</tt>
+      # * <tt>:only_integer</tt>
       #
       # For example:
       #