Check if error is a string to consider it as custom error

lib/simple_form/components/errors.rb

@@ -16,13 +16,13 @@ module SimpleForm
       protected
 
       def error_text
-        text = has_error_in_options? ? options[:error] : errors.send(error_method)
+        text = has_custom_error? ? options[:error] : errors.send(error_method)
 
         "#{html_escape(options[:error_prefix])} #{text}".lstrip.html_safe
       end
 
       def full_error_text
-        text = has_error_in_options? ? options[:error] : full_errors.send(error_method)
+        text = has_custom_error? ? options[:error] : full_errors.send(error_method)
         text.html_safe
       end
 
@@ -54,8 +54,8 @@ module SimpleForm
         reflection ? object.full_messages_for(reflection.name) : []
       end
 
-      def has_error_in_options?
+      def has_custom_error?
-        options[:error] && !options[:error].nil?
+        options[:error].is_a?(String)
       end
     end
   end

test/form_builder/error_test.rb

@@ -156,6 +156,12 @@ class ErrorTest < ActionView::TestCase
     assert_select 'span.error', error_text
   end
 
+  test 'input with custom error works 1' do
+    with_form_for @user, :name, error: true
+
+    assert_select 'span.error', "can't be blank"
+  end
+
   test 'input with custom error does not generate the error if there is no error on the attribute' do
     error_text = "Super User Active! can't be blank"
     with_form_for @user, :active, error: error_text