Add required_by_default as option.

lib/generators/simple_form/templates/simple_form.rb

@@ -1,10 +1,8 @@
 # Use this setup block to configure all options available in SimpleForm.
 SimpleForm.setup do |config|
 
-  # Components used by the form builder to generate a complete input. You can
-  # remove any of them, change the order, or even add your own components in the
-  # stack. By inheriting your component from SimpleForm::Components::Base you'll
-  # have some extra helpers for free.
+  # Components used by the form builder to generate a complete input. You can remove
+  # any of them, change the order, or even add your own components to the stack.
   # config.components = [ :label_input, :hint, :error ]
 
   # Default tag used on hints.
@@ -16,19 +14,22 @@ SimpleForm.setup do |config|
   # You can wrap all inputs in a pre-defined tag.
   # config.wrapper_tag = :div
 
-  # CSS class to add to all wrapper tags
+  # CSS class to add to all wrapper tags.
   # config.wrapper_class = :input
 
-  # CSS class to add to the wrapper if the field has errors
+  # CSS class to add to the wrapper if the field has errors.
   # config.wrapper_error_class = :fieldWithErrors
 
   # How the label text should be generated altogether with the required text.
   # config.label_text = lambda { |label, required| "#{required} #{label}" }
 
-  # Series of attemps to detect a default label method for collection
+  # Whether attributes are required by default (or not). Default is true.
+  # config.required_by_default = true
+
+  # Series of attemps to detect a default label method for collection.
   # config.collection_label_methods = [ :to_label, :name, :title, :to_s ]
 
-  # Series of attemps to detect a default value method for collection
+  # Series of attemps to detect a default value method for collection.
   # config.collection_value_methods = [ :id, :to_s ]
 
   # Collection of methods to detect if a file type was given.
@@ -40,6 +41,6 @@ SimpleForm.setup do |config|
   # Default priority for country inputs.
   # config.country_priority = nil
 
-  # Default size for text inputs
+  # Default size for text inputs.
   # config.default_input_size = 50
 end

lib/simple_form.rb

@@ -45,6 +45,10 @@ module SimpleForm
   mattr_accessor :label_text
   @@label_text = lambda { |label, required| "#{required} #{label}" }
 
+  # Whether attributes are required by default (or not).
+  mattr_accessor :required_by_default
+  @@required_by_default = true
+
   # Collection of methods to detect if a file type was given.
   mattr_accessor :file_methods
   @@file_methods = [ :mounted_as, :file?, :public_filename ]

lib/simple_form/inputs/base.rb

@@ -63,7 +63,7 @@ module SimpleForm
       end
 
       def attribute_required_by_default?
-        true
+        SimpleForm.required_by_default
       end
 
       def required_class

test/form_builder_test.rb

@@ -250,6 +250,14 @@ class FormBuilderTest < ActionView::TestCase
     assert_select 'input.required#user_name'
   end
 
+  test 'builder input should not be required by default when ActiveModel::Validations is not included if option is set to false' do
+    swap SimpleForm, :required_by_default => false do
+      with_form_for @user, :name
+      assert_select 'input.optional#user_name'
+    end
+  end
+
+
   test 'builder input should allow disabling required when ActiveModel::Validations is not included' do
     with_form_for @user, :name, :required => false
     assert_no_select 'input.required'