rails 4 populate dropdown values from database

Question

I have a dropdown in a rails form:

<%= f.select :lists, [[\"test1\", 1], [\"test2\", 0]] %>

This works fine but how can I make it dynamic

Answer 1

You can use options_from_collection_for_select.

<% options = options_from_collection_for_select(@list, 'id', 'name') %>
<%= f.select :all_val,  options %>

Answer 2

This worked for me

# view
<%= form.select(:list_id) do %>
    <% @list.each do |l| -%>
      <%= content_tag(:option, l.name, value: l.id) %>
    <% end %>
<% end %>

and

# controller
@list ||= List.all

`

Answer 3

Don't quite have enough reputation to respond to your question in the thread above @learner but there's a good chance that @overflow didn't have @list defined in his controller.

To solve my case I put my equivalent of @list (in this case @restaurants) in my "def new" method since I was using it to help create new items with associated restaurants.

# GET /specials/new
  def new
    @special = Special.new
    @restaurants = Restaurant.all // Look Here
  end

Additionally, :all_val in the original response should be the parameter you want to pass in to the database. In my case it was :restaurant_id