Improve BaseDatagrid with more examples

templates/base.rb.erb

@@ -11,11 +11,35 @@ class BaseGrid
   # Enable forbidden attributes protection
   # self.forbidden_attributes_protection = true
 
-  def self.date_column(name, *args)
+  # Makes a date column
+  # @param name [Symbol] Column name
+  # @param args [Array] Other column helper arguments
+  # @example
+  #   date_column(:created_at)
+  #   date_column(:owner_registered_at) do |model|
+  #     model.owner.registered_at
+  #   end
+  def self.date_column(name, *args, &block)
     column(name, *args) do |model|
-      format(block_given? ? yield : model.send(name)) do |date|
-        date.strftime("%m/%d/%Y")
+      format(block ? block.call(model) : model.public_send(name)) do |date|
+        date&.strftime("%m/%d/%Y") || "—".html_safe
       end
     end
   end
+
+  # Makes a boolean YES/NO column
+  # @param name [Symbol] Column name
+  # @param args [Array] Other column helper arguments
+  # @example
+  #   boolean_column(:approved)
+  #   boolean_column(:has_tasks, preload: :tasks) do |model|
+  #     model.tasks.unfinished.any?
+  #   end
+  def self.boolean_column(name, *args, &block)
+    column(name, *args) do |model|
+      value = block ? block.call(model) : model.public_send(name)
+      value ? "Yes" : "No"
+    end
+  end
+
 end