Custom email unique validation not working on devise - ruby-on-rails

Question

I need to validate email with scope but with devise it is not working. Even after modifying index for email uniqueness it is not allowing user to create on basis of scope.
i have tried adding following line on config/initializers/devise.rb
config.authentication_keys=[:email, :organization_id]
But it doesnot work.
Also i have tried with validation on model:
validates_uniqueness_of :email, scope: :organization_id
But it doesnot work.
Also tried by modifying user migration:
def up
remove_index :users, name: 'index_users_on_email'
add_index :users, [:email, :organization_id], unique: true
end
But it doesnot work as well.
Relation between user model an organization:
app/models/organization.rb
Class Organization < ApplicationRecord
has_many :users
end
app/models/user.rb
class User < ApplicationRecord
belongs_to :organization
end
Here is schema :
create_table "users", force: :cascade do |t|
t.string "type"
t.string "full_name"
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "authentication_token", limit: 30
t.integer "organization_id"
t.string "archive_number"
t.datetime "archived_at"
t.index ["authentication_token"], name: "index_users_on_authentication_token", unique: true
t.index ["email" , "organization_id"], name: "index_users_on_email_and_organization_id", unique: true
t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end
My problem was that:
I have user with email in organizatin 1 now is have to add another user in organization 2 with same email. While doing this i am getting error
ActiveRecord::RecordInvalid: Validation failed: Email has already been
taken
I belive that i should be able to add user with same email after adding scope under validation.

Answer 1

For the email unique validation, you can try this:
Define following in your model:
class User < ApplicationRecord
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :validatable
validates_uniqueness_of :email, scope: :organization
def will_save_change_to_email?
false
end
def email_changed?
false
end
end
This worked for me.