ruby on rails - Why is the devise method encrypted_password= undefined? -

i trying set devise admin model. admin model inherits author. i've done devise setup suggested in documentation , run migrations etc. models below:

author class:

class author < activerecord::base    has_many :articles   validates :first_name, :surname, :email, presence: true end 

admin class:

class admin < author   devise :database_authenticatable, :recoverable, :rememberable, :trackable, :validatable end 

devise migration:

class devisecreateadmins < activerecord::migration   def change     create_table(:admins) |t|     ## database authenticatable     t.string :email,              null: false, default: ""     t.string :encrypted_password, null: false, default: ""      ## recoverable     t.string   :reset_password_token     t.datetime :reset_password_sent_at      ## rememberable     t.datetime :remember_created_at      ## trackable     t.integer  :sign_in_count, default: 0, null: false     t.datetime :current_sign_in_at     t.datetime :last_sign_in_at     t.inet     :current_sign_in_ip     t.inet     :last_sign_in_ip      ## confirmable     # t.string   :confirmation_token     # t.datetime :confirmed_at     # t.datetime :confirmation_sent_at     # t.string   :unconfirmed_email # if using reconfirmable      ## lockable     # t.integer  :failed_attempts, default: 0, null: false # if lock strategy :failed_attempts     # t.string   :unlock_token # if unlock strategy :email or :both     # t.datetime :locked_at       t.timestamps null: false   end    add_index :admins, :email,                unique: true   add_index :admins, :reset_password_token, unique: true   #add_index :admins, :confirmation_token,   unique: true   #add_index :admins, :unlock_token,         unique: true end 

schema showing encrypted_password in db.

create_table "admins", force: :cascade |t| 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.integer  "sign_in_count",          default: 0,  null: false t.datetime "current_sign_in_at" t.datetime "last_sign_in_at" t.inet     "current_sign_in_ip" t.inet     "last_sign_in_ip" t.datetime "created_at",                          null: false t.datetime "updated_at",                          null: false 

the error receive when trying create admin in 1 of tests, or in rails console, follows:

nomethoderror:    undefined method `encrypted_password=' #<admin:0x007fc1c3269e18> 

the test being used is:

   scenario 'signing in correct credentials'     admin.create(first_name: "jonathan", surname: "sayer", email: "test@email.com",               password: "password", password_confirmation: "password")      visit '/login'      fill_in 'email', with: "test@email.com"      fill_in 'password', with: "password"      click_button "log in"      expect(page.current_path).to eq root_path    end 

with error message:

1) signing in  signing in correct credentials  failure/error:    admin.create(first_name: "jonathan", surname: "sayer", email: "test@email.com",                 password: "password", password_confirmation: "password")   nomethoderror:    undefined method `encrypted_password=' #<admin:0x007fc1c3269e18>  # /users/jonathansayer/.rvm/gems/ruby-2.3.0/gems/devise-3.5.6/lib/devise/models/database_authenticatable.rb:43:in `password='  # ./spec/features/logging_in_and_out_spec.rb:5:in `block (2 levels) in <top (required)>' 

any appreciated!! thanks

solution

add self.table_name = "admins" admin model fix error.

explanation

i see admin model inherited author model. btw not recommended unless trying implement sti (single table inheritance). not case here have tables both models. , here lies actual problem.

you see default activerecord connects rails model it's corresponding table in db using pluralized name of model.

so in case author model corresponds authors table in db. since admin inherited author connected authors table.

and why fields expect present in admins table not present. because right admin model knows fields in authors table

the fix explicitly specify table name model.