Backport field_name method for Rails 6.1.

Author: donv

lib/bootstrap_form/inputs/collection_check_boxes.rb

@@ -21,6 +21,14 @@ def collection_check_boxes_with_bootstrap(*args)
         end
 
         bootstrap_alias :collection_check_boxes
+
+        if Rails::VERSION::MAJOR < 7
+          def field_name(method, *methods, multiple: false, index: @options[:index])
+            object_name = @options.fetch(:as) { @object_name }
+
+            @template.field_name(object_name, method, *methods, index: index, multiple: multiple)
+          end
+        end
       end
     end
   end

test/bootstrap_checkbox_test.rb

@@ -473,6 +473,19 @@ class BootstrapCheckboxTest < ActionView::TestCase
                                                                      :street, checked: collection)
   end
 
+  if Rails::VERSION::MAJOR < 7
+    def field_name(object_name, method_name, *method_names, multiple: false, index: nil)
+      names = method_names.map! { |name| "[#{name}]" }.join
+      if object_name.blank?
+        "#{method_name}#{names}#{multiple ? '[]' : ''}"
+      elsif index
+        "#{object_name}[#{index}][#{method_name}]#{names}#{multiple ? '[]' : ''}"
+      else
+        "#{object_name}[#{method_name}]#{names}#{multiple ? '[]' : ''}"
+      end
+    end
+  end
+
   test "collection_check_boxes renders with include_hidden options correctly" do
     collection = [Address.new(id: 1, street: "Foo"), Address.new(id: 2, street: "Bar")]
     expected = <<~HTML