5-forms.md in activeadmin-1.4.0

- old
+ new

@@ -82,10 +82,16 @@
 You can create forms with nested models using the `has_many` method, even if
 your model uses `has_one`:
 
 ```ruby
 ActiveAdmin.register Post do
+  permit_params :title,
+                :published_at,
+                :body,
+                categories_attributes: [:id, :title, :_destroy],
+                taggings_attributes: [:id, :tag],
+                comment_attributes: [:id, :body, :_destroy]
 
   form do |f|
     f.inputs 'Details' do
       f.input :title
       f.input :published_at, label: 'Publish Post At'
@@ -104,20 +110,23 @@
       end
     end
     f.inputs do
       f.has_many :comment,
                  new_record: 'Leave Comment',
-                 allow_destroy: -> { |c| c.author?(current_admin_user) } do |b|
+                 allow_destroy: -> (c) { c.author?(current_admin_user) } do |b|
         b.input :body
       end
     end
     f.actions
   end
 
 end
 ```
 
+*NOTE*: In addition to using `has_many` as illustrated above, you'll need to add
+`accepts_nested_attributes` to your parent model and [configure strong parameters](https://activeadmin.info/2-resource-customization.html)
+
 The `:allow_destroy` option adds a checkbox to the end of the nested form allowing
 removal of the child object upon submission. Be sure to set `allow_destroy: true`
 on the association to use this option. It is possible to associate
 `:allow_destroy` with a string or a symbol, corresponding to the name of a child
 object's method that will get called, or with a Proc object. The Proc object
@@ -157,10 +166,13 @@
                       max_date: "+1W +5D"
                     }
 end
 ```
 
+Datepicker also accepts the `:label` option as a string or proc to display.
+If it's a proc, it will be called each time the datepicker is rendered.
+
 ## Displaying Errors
 
 To display a list of all validation errors:
 
 ```ruby
@@ -185,18 +197,20 @@
           f.input :password
           f.input :password_confirmation
         end
       end
 
-      tab 'Advanced' do
+      tab 'Advanced', html_options: { class: 'specific_css_class' } do
         f.inputs 'Advanced Details' do
           f.input :role
         end
       end
     end
     f.actions
   end
 ```
+
+`html_options` allows you set additional html params for tab's menu item.
 
 # Customize the Create Another checkbox
 
 In order to simplify creating multiple resources you may enable ActiveAdmin to
 show nice "Create Another" checkbox alongside of Create Model button. It may be