How can display an asociated value on nested form rails?

Question

I have 3 tables gas, pot and pot details I'm trying to display an asociated value

 Tables: 
     gas: id   name    
          1     gas1
          2     gas2
          3     gas3

     pot:  id name
            1  pot1

     pot_details
           id pot_id  gas_id   name
            1  1        1      abc
            2  1        2      cde

I'm tring to display the gas name insted of gas_id on nested form

      <% f.fields_for :pot_details do |pot_detail_form| %>  
         <%= pot_detail_form.text_field :gas_id %>
         <%= pot_detail_form.text_field :name %>
      <% end %>

I tried

      <%= pot_detail_form.label :gas_id , value: @gas.pluck(:gas_id).join(' ,')  %>

I'm trying to replace gas_id and display gas.name

I'm trying to show this result

      <label> gas1</label>
      <input>input 1 </input>