Rails: submit child model in nested form -

i've researched while on topic haven't found real solution trying achieve.

i'm working nested one-to-many nested form (project has many tasks). , each task has many attributes, e.g. type, assigned_individual, due_date, etc. got no problem having parent project , nested child model tasks saved/updated on 1 submit. need achieve seems opposite of effort. need 1 ajax save call each task besides global submit. when task list gets long, users don't have worry losing have written earlier other tasks. can click save button , get's feedback saying has entered task has been saved.

currently project in form_for wrapper, , tasks in fields_for partial these simplified version of have right now. here form in edit.html.erb

<%= form_for @project |f| %>    <p>f.text_field :title</p>    <p>f.text_field :author</p>    <%= render :partial=> 'tasks', :collection=> @project.tasks %> <%= f.submit 'submit' %> <% end %> 

here tasks partial:

<%= fields_for :tasks |f| %>   <label>category</label>   <%= f.text_field :category%>        <label>description</label>   <%= f.text_field :description%>     <label>author</label>   <%= f.text_field :author%>    <label>assigned individual</label>   <%= f.text_field :assigned_individual%>   <label>notes</label>   <%= f.text_area :notes%>   <label>due date</label>   <%= f.text_field :due_date%>   <button onclick='update_task();'>save task</button>  <% end %> 

since cannot have multiple submit button in 1 form, can think of right use jquery collect every single user entry in partial , pass them big hash task controller update method.

update_task() 

but there cleaner way?