Rails 4: Adding child_index to dynamically added (nested) form fields with Cocoon Gem

Question

UPDATED: I am trying to add/remove form fields to a nested form involving multiple models. I have seen the \"Dynamic Forms\" railscast by Ryan Bates and I have referred to this

Answer 1

add this in your js.coffe file
$(document).on 'click', 'form .remove_', (event) ->
$(this).prev('input[type=hidden]').val('1')
$(this).closest('fieldset').hide()
event.preventDefault()

$(document).on 'click', 'form .add_teacher', (event) ->
event.preventDefault()
time = new Date().getTime()
regexp = new RegExp($(this).data('id'), 'g')
$(this).before($(this).data('fields').replace(regexp, time))