Grant Heaslip Grant Heaslip - 2 months ago 12
Ajax Question

How do I set a unique ID for checkboxes in a multi-record Rails form?

I've set up a Rails form roughly following the instructions in this Railscast.

Here's the code for the form:

<% form_tag complete_todos_path, :method => :put do %>
<ul>
<div id="incomplete_todos">
<% @incomplete_todos.each do |todo| %>
<%= render :partial => todo %>
<% end %>
</div>
</ul>
<%= submit_tag "Mark as completed" %>
<% end %>


And here's the code for the todo partial:

<div class="todo">
<li>
<%= check_box_tag "todo_ids[]", todo.id %>
<%=h todo.name %>
<%= link_to 'edit', edit_todo_path(todo) %>
<%= link_to 'delete', todo, :confirm => 'Are you sure?', :method => :delete %>
</li>
</div>


It's working great, but I'm looking to start implementing AJAX and I need each checkbox to have a unique id. Right now, the input tags generated look something like this:

<input id="todo_ids_" name="todo_ids[]" type="checkbox" value="7" />


Every check box has the same id ("todo_ids_"), which is a problem. I suspect the solution is embarrassingly simple, but I'm not seeing it. Any tips?

Answer

I ended up using a solution similar to Ryan's, but as I wrote in the comment I had to make a further change. In the form:

<%= check_box_tag "todo_ids[#{todo.id}]", todo.id %>

In the action called by the form:

Todo.update_all(["completed_at = ?", Time.now], :id => params[:todo_ids].keys)

Note the "params[:todo_ids].keys" at the end, which was a workaround to deal with the odd way the parameters were formatted:

"todo_ids" => {"5"=>"5"}
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