Fix nested style check for options hash

lib/simple_form/inputs/boolean_input.rb

@@ -18,7 +18,7 @@ module SimpleForm
       private
 
       def nested_style?
-        options[:boolean_style] || SimpleForm.boolean_style == :nested
+        options.fetch(:boolean_style, SimpleForm.boolean_style) == :nested
       end
 
       # Booleans are not required by default because in most of the cases

test/inputs/boolean_input_test.rb

@@ -28,12 +28,20 @@ class BooleanInputTest < ActionView::TestCase
     end
   end
 
-  test 'input accepts changing boolean style through given options' do
+  test 'input accepts changing boolean style to nested through given options' do
     with_input_for @user, :active, :boolean, :boolean_style => :nested
     assert_select 'label > input.boolean'
     assert_no_select 'label.boolean'
   end
 
+  test 'input accepts changing boolean style to inline through given options, when default is nested' do
+    swap SimpleForm, :boolean_style => :nested do
+      with_input_for @user, :active, :boolean, :boolean_style => :inline
+      assert_select 'input.boolean + label.boolean'
+      assert_no_select 'label > input'
+    end
+  end
+
   test 'input with nested style allows disabling label' do
     swap SimpleForm, :boolean_style => :nested do
       with_input_for @user, :active, :boolean, :label => false