Ruby on Rails - Update multiple data in a table with select (bulk edit)

Your original text wasn't that confusing to me...

You want what's called a bulk edit feature. Easiest way would be to set up a new target at the controller level specifically to handle this request. I'll give you the pseudocode and it should be easy enough to fill in the blanks, but essentially:

1. Create a "bulk edit" form (the drop down select menu above the table)
2. Create a controller method to handle the bulk edit (controller#bulk)
3. Update routes.rb to direct a URL to that new method
4. Handle the bulk update in the controller and redirect back to index upon completion (cheap way of updating the page after editing is done).

Note: I'm assuming your model name is "Resource" because you did not specify what it actually was

On your index page, you want HTML like:

<form method="POST" action="/resources/bulk">
  <select name="bulk_value">...</select>
</form>

On change/form submit/whatever, submit that form.

If you're using resourceful routing, you can hook this into config.rb via:

resources :resources do
  post :bulk, on: :collection
end

Otherwise, hook the route however you see fit.

Then, in your controller:

def bulk
  value = params[:bulk_value]
  Resource.update_all value: value
  redirect_to {resources_path}
end

Now, you said index view, so I am assuming you want all. But if you just want a subset, you can pass the preferred IDs along with the form as a hidden field, then use a where clause to filter, i.e.

Resource.where(id: parmas[:id_array]).update_all(value: value)

Anyway, that should get you down the right path.