Add ProcedurePath#valid?

app/controllers/admin/procedures_controller.rb

@@ -94,17 +94,7 @@ class Admin::ProceduresController < AdminController
   def publish
     procedure = current_administrateur.procedures.find(params[:procedure_id])
 
-    new_procedure_path = ProcedurePath.new(
-      {
-        path: params[:procedure_path],
-        procedure: procedure,
-        administrateur: procedure.administrateur
-      }
-    )
-
-    if new_procedure_path.validate
-      new_procedure_path.delete
-    else
+    if !ProcedurePath.valid?(procedure, params[:procedure_path])
       flash.alert = 'Lien de la démarche invalide'
       return redirect_to admin_procedures_path
     end

app/models/procedure_path.rb

@@ -6,6 +6,11 @@ class ProcedurePath < ApplicationRecord
   belongs_to :procedure
   belongs_to :administrateur
 
+  def self.valid?(procedure, path)
+    create_with(procedure: procedure, administrateur: procedure.administrateur)
+      .find_or_initialize_by(path: path).validate
+  end
+
   def self.find_with_path(path)
     joins(:procedure)
       .where.not(procedures: { aasm_state: :archivee })