Allow to add custom errors to input

This commit allows us to add error class to input in our wrappers. With
it, when a validation happens, the input will be rendered with our
custom error class.

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Unreleased
 
-* Remove support from Rails 4.0, 4.1 and 4.2 [@feliperenan](https://github.com/feliperenan)
+* Allow custom errors classes to inputs . [@feliperenan](https://github.com/feliperenan)
+* Remove support from Rails 4.0, 4.1 and 4.2. [@feliperenan](https://github.com/feliperenan)
 
 ### Bug fix
 * Fix horizontal form label position, from right to text-right. [@cavpollo](https://github.com/cavpollo)

README.md

@@ -901,11 +901,12 @@ You can customize _Form components_ passing options to them:
 
 ```ruby
 config.wrappers do |b|
-  b.use :label_input, class: 'label-input-class'
+  b.use :label_input, class: 'label-input-class', error_class: 'is-invalid'
 end
 ```
 
-This you set the input and label class to `'label-input-class'`.
+This you set the input and label class to `'label-input-class'` and will set the class `'is-invalid'` 
+when the input has errors.
 
 If you want to customize the custom _Form components_ on demand you can give it a name like this:
 

lib/generators/simple_form/templates/config/initializers/simple_form.rb

@@ -45,6 +45,7 @@ SimpleForm.setup do |config|
     b.optional :readonly
 
     ## Inputs
+    # b.use :input, class: 'input', error_class: 'is-invalid'
     b.use :label_input
     b.use :hint,  wrap_with: { tag: :span, class: :hint }
     b.use :error, wrap_with: { tag: :span, class: :error }

lib/simple_form/inputs/base.rb

@@ -191,6 +191,8 @@ module SimpleForm
 
       def merge_wrapper_options(options, wrapper_options)
         if wrapper_options
+          wrapper_options = set_input_classes(wrapper_options)
+
           wrapper_options.merge(options) do |key, oldval, newval|
             case key.to_s
             when "class"
@@ -206,6 +208,17 @@ module SimpleForm
         end
       end
 
+      def set_input_classes(wrapper_options)
+        wrapper_options = wrapper_options.dup
+        error_class     = wrapper_options.delete(:error_class)
+
+        if error_class.present? && has_errors?
+          wrapper_options[:class] = "#{wrapper_options[:class]} #{error_class}"
+        end
+
+        wrapper_options
+      end
+
       def i18n_scope
         SimpleForm.i18n_scope
       end

test/form_builder/wrapper_test.rb

@@ -38,6 +38,18 @@ class WrapperTest < ActionView::TestCase
     assert_select 'div.field_with_errors'
   end
 
+  test 'wrapper adds error class to input for attribute with errors' do
+    with_form_for @user, :name, wrapper: custom_wrapper_with_input_error_class
+    assert_select 'div.field_with_errors'
+    assert_select 'input.is-invalid'
+  end
+
+  test 'wrapper does not add error class to input when the attribute is valid' do
+    with_form_for @user, :phone_number, wrapper: custom_wrapper_with_input_error_class
+    assert_no_select 'div.field_with_errors'
+    assert_no_select 'input.is-invalid'
+  end
+
   test 'wrapper adds hint class for attribute with a hint' do
     with_form_for @user, :name, hint: 'hint'
     assert_select 'div.field_with_hint'

test/support/misc_helpers.rb

@@ -206,6 +206,13 @@ module MiscHelpers
     end
   end
 
+  def custom_wrapper_with_input_error_class
+    SimpleForm.build tag: :div, class: "custom_wrapper", error_class: :field_with_errors do |b|
+      b.use :label
+      b.use :input, class: 'inline-class', error_class: 'is-invalid'
+    end
+  end
+
   def custom_form_for(object, *args, &block)
     simple_form_for(object, *args, { builder: CustomFormBuilder }, &block)
   end