Support custom fields without corresponding model attributes

lib/administrate/page/base.rb

@@ -36,7 +36,7 @@ def attribute_field(dashboard, resource, attribute_name, page)
  end
 
  def get_attribute_value(resource, attribute_name)
- resource.public_send(attribute_name)
+ resource.try(attribute_name)
  end
 
  attr_reader :dashboard, :options

spec/example_app/app/dashboards/customer_dashboard.rb

@@ -17,7 +17,8 @@ class CustomerDashboard < Administrate::BaseDashboard
  searchable_fields: ["name"],
  include_blank: true
  ),
- password: Field::Password
+ password: Field::Password,
+ non_attribute_field: NonAttributeField
  }
 
  COLLECTION_ATTRIBUTES = ATTRIBUTE_TYPES.keys - %i[created_at updated_at]

spec/example_app/app/fields/non_attribute_field.rb

@@ -0,0 +1,5 @@
+class NonAttributeField < Administrate::Field::Base
+ def to_s
+ "Hello, Non Attribute Field"
+ end
+end

spec/example_app/app/views/fields/non_attribute_field/_form.html.erb

@@ -0,0 +1 @@
+<p>NonAttributeField is not supposed to be used in form.</p>

spec/example_app/app/views/fields/non_attribute_field/_index.html.erb

@@ -0,0 +1 @@
+<%= field.to_s %>

spec/example_app/app/views/fields/non_attribute_field/_show.html.erb

@@ -0,0 +1 @@
+<%= field.to_s %>

spec/features/show_page_spec.rb

@@ -277,6 +277,14 @@
  end
  end
 
+ it "displays non-attribute field" do
+ customer = create(:customer)
+
+ visit admin_customer_path(customer)
+
+ expect(page).to have_text("Hello, Non Attribute Field")
+ end
+
  def ids_in_table
  all("tr td:first-child").map(&:text).map(&:to_i)
  end