Improving taxon edit

If there was any error when trying to edit a taxon, it
was not showing any error and just redirecting to taxons index,
this change renders edit form showing errors correctly instead
of just redirect without any flash message.

backend/app/controllers/spree/admin/taxons_controller.rb

@@ -62,7 +62,13 @@ def update
  end
 
  respond_with(@taxon) do |format|
- format.html { redirect_to edit_admin_taxonomy_url(@taxonomy) }
+ format.html do
+ if @taxon.valid?
+ redirect_to edit_admin_taxonomy_url(@taxonomy)
+ else
+ render :edit
+ end
+ end
  end
  end
 

core/app/models/spree/taxon.rb

@@ -13,8 +13,7 @@ class Taxon < Spree::Base
  has_many :promotion_rule_taxons
  has_many :promotion_rules, through: :promotion_rule_taxons
 
- before_create :set_permalink
- before_update :set_permalink
+ before_validation :set_permalink
  after_update :update_child_permalinks, if: :saved_change_to_permalink?
 
  validates :name, presence: true