Delete mail validate for bind action

app/controllers/oauth/educoder_controller.rb

@@ -2,11 +2,11 @@ class Oauth::EducoderController < Oauth::BaseController
   def bind
     begin
       login = params[:login]
-      mail = params[:mail]
+      mail = params[:mail] || nil
       callback_url = params[:callback_url]
       token = params[:token]
 
-      ::OauthEducoderForm.new({login: login, token: token, mail: mail, callback_url: callback_url}).validate!
+      ::OauthEducoderForm.new({login: login, token: token, callback_url: callback_url}).validate!
 
       open_user= OpenUsers::Educoder.find_by(uid: login)
 

app/forms/oauth_educoder_form.rb

@@ -1,11 +1,10 @@
 class OauthEducoderForm
   include ActiveModel::Model
 
-  attr_accessor :login, :token, :mail, :callback_url
+  attr_accessor :login, :token, :callback_url
 
   validates :login, presence: true
   validates :token, presence: true
-  validates :mail, presence: true
   validates :callback_url, presence: true
 
   validate :check_callback_url!