Move geozone 'safe to destroy' check from controller to model

app/controllers/admin/geozones_controller.rb

@@ -33,18 +33,9 @@ class Admin::GeozonesController < Admin::BaseController
   end
 
   def destroy
-    # Check that in none of the other associated models tables a record exists
-    # referencing this geozone
-    safe_to_destroy = true
-
-    Geozone.reflect_on_all_associations.each do |association|
-      attached_model = association.klass
-      safe_to_destroy &= attached_model.where(geozone: @geozone).empty?
-    end
-
-    if safe_to_destroy
+    if @geozone.safe_to_destroy?
       @geozone.destroy
-      redirect_to admin_geozones_url, notice: t('admin.geozones.delete.success')
+      redirect_to admin_geozones_path, notice: t('admin.geozones.delete.success')
     else
       redirect_to admin_geozones_path, flash: { error: t('admin.geozones.delete.error') }
     end

app/models/geozone.rb

@@ -9,4 +9,9 @@ class Geozone < ActiveRecord::Base
     Geozone.pluck(:name)
   end
 
+  def safe_to_destroy?
+    Geozone.reflect_on_all_associations(:has_many).all? do |association|
+      association.klass.where(geozone: self).empty?
+    end
+  end
 end