ruby on rails - Simple_form, edit multiple associated items -

i'm trying edit multiple association in single form. i'm using simple form , association easy:

class gallery  has_many :pictures end  class pictures end 

every picture has image , caption, have uploaded pictures in separated form: need add caption text every picture in single form.

i try simple_form doing this:

 = simple_form_for [:admin, gallery] |form|     - if gallery.pictures.present?         - gallery.pictures.each |p|                  = image_tag(p.image.url(:thumb), height: '50') 

but cannot find way add caption text field every picture of gallery.

any hint?

use method simple_fields_for nested resources

example:

simple_form_for [:admin, @gallery] |f|   f.simple_fields_for :pictures |p|     # here have simple_form methods available     p.input :caption   end end 

also, add line gallery class

#this allow save attributes on associated records through parent accepts_nested_attributes_for :pictures 

update - show small thumb inside form each picture

image_tag(p.object.image.url(:thumb), height: '50')