gistfile1.txt

  create_table "drugs", :force => true do |t|
    t.string   "nume"
    t.string   "dci"
    t.float    "doza"
    t.string   "cod"
    t.string   "diagnostic"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
  end


form:
<fieldset>
  <%= f.label :dci, "DCI" %>
  <%= f.collection_select :dci, Drug.order(:dci), :id, :dci %>
  <%= f.label :nume, "Denumire comerciala" %>
  <%= f.grouped_collection_select :drug_id,  Drug.all, :dci, :dci, :nume, :id%>
  <%= link_to  "Sterge medicament din reteta", "#", class: "remove_fields" %>
</fieldset>

error:
undefined method `map' for "Metformin":String #where Metformin is a nume for the drug