Use dom.array_name

Author: nimmolo

lib/superform/dom.rb

@@ -29,6 +29,12 @@ def name
       names.map { |name| "[#{name}]" }.unshift(root).join
     end
 
+    # Returns the name with `[]` appended for array/multiple value fields.
+    # Used by multiple selects, checkbox groups, etc.
+    def array_name
+      "#{name}[]"
+    end
+
     # Emit the id, name, and value in an HTML tag-ish that doesnt have an element.
     def inspect
       "<id=#{id.inspect} name=#{name.inspect} value=#{value.inspect}/>"

lib/superform/rails/components/select.rb

@@ -28,7 +28,7 @@ def view_template(&block)
           # Hidden input ensures a value is sent even when all options are
           # deselected in a multiple select
           if @multiple
-            hidden_name = field.parent.is_a?(Superform::Field) ? dom.name : "#{dom.name}[]"
+            hidden_name = field.parent.is_a?(Superform::Field) ? dom.name : dom.array_name
             input(type: "hidden", name: hidden_name, value: "")
           end
 
@@ -75,7 +75,7 @@ def field_attributes
             if @multiple
               # Only append [] if the field doesn't already have a Field parent
               # (which would mean it's already in a collection and has [] notation)
-              name = field.parent.is_a?(Superform::Field) ? attrs[:name] : "#{attrs[:name]}[]"
+              name = field.parent.is_a?(Superform::Field) ? attrs[:name] : dom.array_name
               attrs.merge(multiple: true, name: name)
             else
               attrs