Add option to enforce translations

Author: Nerian

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 * Remove test files from the gem package. [@orien](https://github.com/orien)
 * Speed up input mapping lookup by avoiding rescuing exceptions. [@meanphil](https://github.com/meanphil) [@kriom](https://github.com/kriom) [@egeek](https://github.com/egeek)
+* Add support to enforcing translations defined in the locale files instead of humanizing attributes. [@Nerian](https://github.com/Nerian)
 
 ## 5.2.0
 

lib/simple_form.rb

@@ -213,6 +213,11 @@ def self.configured? #:nodoc:
   mattr_accessor :input_field_valid_class
   @@input_field_valid_class = nil
 
+  # If set to true all labels, hints, and placeholders would be expected to have an entry in a locale file and raise
+  # an exception if not.
+  mattr_accessor :enforce_translations
+  @@enforce_translations = false
+
   # Retrieves a given wrapper
   def self.wrapper(name)
     @@wrappers[name.to_s] or raise WrapperNotFound, "Couldn't find wrapper with name #{name}"

lib/simple_form/components/labels.rb

@@ -71,7 +71,7 @@ def required_label_text #:nodoc:
 
       # First check labels translation and then human attribute name.
       def label_translation #:nodoc:
-        if SimpleForm.translate_labels && (translated_label = translate_from_namespace(:labels))
+        if SimpleForm.translate_labels && (translated_label = translate_from_namespace(:labels, mandatory: true))
           translated_label
         elsif object.class.respond_to?(:human_attribute_name)
           object.class.human_attribute_name(reflection_or_attribute_name.to_s)

lib/simple_form/inputs/base.rb

@@ -171,7 +171,7 @@ def html_options_for(namespace, css_classes)
       #            email: 'E-mail.'
       #
       #  Take a look at our locale example file.
-      def translate_from_namespace(namespace, default = '')
+      def translate_from_namespace(namespace, default = '', mandatory: false)
         model_names = lookup_model_names.dup
         lookups     = []
 
@@ -184,9 +184,13 @@ def translate_from_namespace(namespace, default = '')
         end
         lookups << :"defaults.#{lookup_action}.#{reflection_or_attribute_name}"
         lookups << :"defaults.#{reflection_or_attribute_name}"
-        lookups << default
+        lookups << default unless SimpleForm.enforce_translations
 
-        I18n.t(lookups.shift, scope: :"#{i18n_scope}.#{namespace}", default: lookups).presence
+        I18n.t(
+          lookups.shift,
+          scope: :"#{i18n_scope}.#{namespace}",
+          default: lookups,
+          raise: SimpleForm.enforce_translations && mandatory).presence
       end
 
       def merge_wrapper_options(options, wrapper_options)

test/components/label_test.rb

@@ -85,6 +85,16 @@ def @controller.action_name; nil; end
     end
   end
 
+  test 'missing translation in location file raises exception if SimpleForm.enforce_translations is true' do
+    swap SimpleForm, enforce_translations: true do
+      store_translations(:en, simple_form: { }) do
+        assert_raise I18n::MissingTranslationData do
+          with_label_for @user, :age, :integer
+        end
+      end
+    end
+  end
+
   test 'label uses i18n with lookup for association name' do
     store_translations(:en, simple_form: { labels: {
       user: { company: 'My company!' }