many changes

app/views/suppliers/products/_form.html.slim

@@ -1,22 +1,18 @@
-= form_for [:suppliers, @product], html: {class: 'form-horizontal' } do |f|
+= simple_form_for [:suppliers, @product], html: {class: 'form-horizontal'} do |f|
   = render 'error_messages', target: @product
-  .control-group class=(@product.errors[:name].any? ? 'error' : nil)
-    = f.label :name, class: 'control-label'
+  = f.input :name
+  = f.input :code
+  = f.input :price
+  .control-group
+    = hidden_field_tag 'product[product_category_ids][]', []
+    = label_tag nil, ProductCategory.model_name.human_plural, class: 'control-label'
     .controls
-      = f.text_field :name, class: 'text_field'
-  .control-group class=(@product.errors[:code].any? ? 'error' : nil)
-    = f.label :code, class: 'control-label'
-    .controls
-      = f.text_field :code, class: 'text_field'
-  .control-group class=(@product.errors[:price].any? ? 'error' : nil)
-    = f.label :price, class: 'control-label'
-    .controls
-      = f.text_field :price, class: ['text_field', :currency]
-  .control-group class=(@product.errors[:product_category_id].any? ? 'error' : nil)
-    = f.label :product_category_id, ProductCategory.model_name.human, class: 'control-label'
-    .controls
-      = f.collection_select :product_category_id, current_supplier.product_categories, :id, :name, include_blank: ''
+      - for product_category in current_supplier.product_categories
+        = check_box_tag "product[product_category_ids][]", product_category.id, @product.product_categories.to_a.include?(product_category), id: "product-category-checker-#{product_category.id}"
+        = label_tag "product-category-checker-#{product_category.id}", product_category.name
+        br
+
   .form-actions
-    = f.submit nil, class: 'btn btn-primary'
+    = f.button :submit, class: 'btn-primary'
     '
     = link_to t("helpers.links.cancel"), suppliers_products_path, class: 'btn'

app/views/suppliers/products/index.html.slim

@@ -8,7 +8,7 @@
           th= model_class.human_attribute_name(:name)
           th= model_class.human_attribute_name(:code)
           th.currency= model_class.human_attribute_name(:price)
-          th= ProductCategory.model_name.human
+          th= ProductCategory.model_name.human_plural
           th.timestamp= model_class.human_attribute_name(:created_at)
           th.actions=t 'helpers.actions'
       tbody
@@ -17,7 +17,7 @@
             td.link= link_to product.name, [:suppliers, product]
             td= product.code
             td.currency=currency product.price
-            td.link= link_to_if product.product_category.present?, product.product_category.try(:name), [:suppliers, product.product_category]
+            td.link= product.category_links namespace: :suppliers 
             td.timestamp=l product.created_at, format: :short
             td.actions
               = link_to t('helpers.links.edit'), [:edit, :suppliers, product], class: 'btn btn-mini'

app/views/suppliers/products/show.html.slim

@@ -8,9 +8,8 @@ dl.dl-horizontal.show-list
   dd= @product.code
   dt= model_class.human_attribute_name(:price)
   dd=currency @product.price
-  - if @product.product_category.present?
-    dt= ProductCategory.model_name.human
-    dd= link_to @product.product_category.name, @product.product_category
+  dt= ProductCategory.model_name.human_plural
+  dd= @product.category_links(namespace: :suppliers)
 
 .form-actions
   = link_to t("helpers.links.back"), suppliers_products_path, class: 'btn'