Revert "turns out this was manually disabled"

This reverts commit 7330b68.

app/models/product.rb

@@ -6,6 +6,7 @@ class Product < ApplicationRecord
   has_many :price_lists, through: :product_prices, dependent: :restrict_with_error
 
   validates :name, :category, presence: true
+  validate :name_readonly
 
   accepts_nested_attributes_for :product_prices, allow_destroy: true
 
@@ -18,4 +19,10 @@ def t_category
   end
 
   private
+
+  def name_readonly
+    return if new_record?
+
+    errors.add(:name, 'is readonly') if name_changed?
+  end
 end

app/views/price_lists/index.html.erb

@@ -25,11 +25,11 @@
         <div class="form-check">
           <input class="form-check-input" type="checkbox" id="show-archived-check" v-model="showArchived">
           <label class="form-check-label" for="show-archived-check">
-            Laat gearchieveerde prijslijsten zien
+            Laat gearchieveerde prijslijsten zien 
           </label>
         </div>
       <% end %>
-
+      
       <table id='price-lists-table' class='price-lists-table table table-striped overflow-scroll mw-100 mx-auto d-block pe-2'>
         <thead class="table-header-rotated products">
         <tr>
@@ -60,7 +60,7 @@
             </td>
             <td class="products-new products-name">
               <div class="d-flex">
-                <input class="form-control flex-grow-1" placeholder="Productnaam" type="text" v-model="product.name">
+                <input class="form-control flex-grow-1" placeholder="Productnaam" type="text" v-model="product.name" :disabled="product.id"/>
               </div>
             </td>
             <td class="products-new products-category">