Allows custom errors #761

lib/simple_form/components/errors.rb

@@ -5,8 +5,12 @@ module SimpleForm
         error_text if has_errors?
       end
 
+      def has_error_in_options?
+        options[:error] && !options[:error].nil?
+      end
+
       def has_errors?
-        object && object.respond_to?(:errors) && errors.present?
+        (object && object.respond_to?(:errors) && errors.present?) || has_error_in_options?
       end
 
       protected
@@ -24,7 +28,7 @@ module SimpleForm
       end
 
       def errors_on_attribute
-        object.errors[attribute_name]
+        has_error_in_options? ? [options[:error]] : object.errors[attribute_name]
       end
 
       def errors_on_association

lib/simple_form/inputs/base.rb

@@ -45,7 +45,7 @@ module SimpleForm
       end
 
       # Always enabled.
-      enable :hint
+      enable :hint, :error
 
       # Usually disabled, needs to be enabled explicitly passing true as option.
       disable :maxlength, :placeholder, :pattern, :min_max

test/form_builder/error_test.rb

@@ -14,6 +14,10 @@ class ErrorTest < ActionView::TestCase
     end
   end
 
+  def with_custom_error_for(object, *args)
+    with_form_for(object, *args)
+  end
+
   test 'error should not generate content for attribute without errors' do
     with_error_for @user, :active
     assert_no_select 'span.error'
@@ -123,4 +127,13 @@ class ErrorTest < ActionView::TestCase
       assert_select 'span.omg_error', "can't be blank"
     end
   end
+  
+  # CUSTOM ERRORS
+  
+  test 'input with custom error works' do
+    error_text = "Super User Name! can't be blank"
+    with_custom_error_for(@user, :name, error: error_text)
+    
+    assert_select 'span.error', "#{error_text}"
+  end
 end