Dynamic checkbox with Ajax in Rails - ruby-on-rails

Question

I have a Form with some checkboxes loaded from the Database, and an option to add other items manually to the items table. This is done by Ajax in the code below...
item_controller.rb
def manual_item_add
#manual_item = Item.find(params[:id_item].to_i)
respond_to do |format|
format.js
end
end
manual_item_add.js.erb
$("#items_table").append("<%= escape_javascript(render 'manual_item_add', :manual_item => #manual_item) %>")
_manual_item_add.html.erb
...
<td><%= check_box_tag("manual_items[]", item.id, true) %></td>
...
edit_items.html.erb
<%= form_tag( {controller:"item", action:"edit_items"}) do %>
<p align="center">
<%= select_date(#account.start_date, prefix: 'start_date') %>
to
<%= select_date(#account.end_date, prefix: 'end_date') %>
</p>
<%= hidden_field_tag 'id_account', #account.id %>
<table id="items_table" class="subtable" align="center" width="55%">
....
<tr>
<th colspan="6">Items added manually</th>
</tr>
<tr>
<th># ID</th>
<th>Type</th>
<th>Description</th>
<th>Ammount</th>
<th>Date</th>
<th>Include in the account</th>
</tr>
</table>
<p align="center"><%= submit_tag("Save", class: "btn") %></p>
<% end %>
<%= form_tag( {controller:"item", action:"manual_item_add"}, method:"get", remote: true) do %>
<h4 align="center">Add item manually</h4>
<p align="center">Item ID:
<%= text_field_tag "item_id", nil , size:5, maxlength:5 %>
<%= submit_tag("Add Item", class: "light_btn") %>
</p>
<% end %>
So... the problem here is that though I see the new checkboxes i am adding to the table (they are being created normally), the "manual_items[]" array is not being passed to the controller when I submit the resulting form (by the way, the "items_table" is inside the form definition).
Does anybody know what I am doing wrong? Sorry for the newbie question, I'm starting to work with Ruby + Rails.

Answer 1

Unfortunately, I don't have a definitive answer for this problem. The only working solution I've tried was to use JQuery to force parameters to be part of the form:
$(document).ready(function() {
$("#edit_items_form").submit(function(event) {
$(this).append($("input[name='manual_items[]']:checked"));
$(this).submit();
});
});
I am definitely not comfortable to this solution, I'd like to know why these Ajax checkboxes are not automatically recognized as being part the form.