Use send instead of instance_eval

Author: lifo

activemodel/lib/active_model/errors.rb

@@ -68,7 +68,7 @@ def add(attribute, message = nil, options = {})
     # Will add an error message to each of the attributes in +attributes+ that is empty.
     def add_on_empty(attributes, custom_message = nil)
       [attributes].flatten.each do |attribute|
-        value = @base.instance_eval { read_attribute_for_validation(attribute) }
+        value = @base.send(:read_attribute_for_validation, attribute)
         is_empty = value.respond_to?(:empty?) ? value.empty? : false
         add(attribute, :empty, :default => custom_message) unless !value.nil? && !is_empty
       end
@@ -77,7 +77,7 @@ def add_on_empty(attributes, custom_message = nil)
     # Will add an error message to each of the attributes in +attributes+ that is blank (using Object#blank?).
     def add_on_blank(attributes, custom_message = nil)
       [attributes].flatten.each do |attribute|
-        value = @base.instance_eval { read_attribute_for_validation(attribute) }
+        value = @base.send(:read_attribute_for_validation, attribute)
         add(attribute, :blank, :default => custom_message) if value.blank?
       end
     end
@@ -146,7 +146,7 @@ def generate_message(attribute, message = :invalid, options = {})
       defaults = defaults.compact.flatten << :"messages.#{message}"
 
       key = defaults.shift
-      value = @base.instance_eval { read_attribute_for_validation(attribute) }
+      value = @base.send(:read_attribute_for_validation, attribute)
 
       options = { :default => defaults,
         :model => @base.class.name.humanize,

activemodel/lib/active_model/validations.rb

@@ -66,7 +66,7 @@ def validates_each(*attrs)
         # Declare the validation.
         send(validation_method(options[:on]), options) do |record|
           attrs.each do |attr|
-            value = record.instance_eval { read_attribute_for_validation(attr) }
+            value = record.send(:read_attribute_for_validation, attr)
             next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank])
             yield record, attr, value
           end