Rails devise could't update User model fields - ruby-on-rails-4

Question

I couldn't update user information following suggested procedures on devise's own page. When I click the Update button in the form it redirects back to to user/show without updating anything. The logs on console shows the RegistrationsController#update action was called instead the update_resource action from my custom RegistrationController.
logs:
Started PATCH "/users" for 127.0.0.1 at 2016-12-11 18:34:51 +0200
Processing by RegistrationsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"5vqLuQKyuJIoCx0mYfBUhIQmvS0Il5jy+ty1f2XDsehJM4i3M8mMPK5tdPpVQ6MFHIj05ZcRKO7rhlxroM75pQ==", "user"=>{"first_name"=>"Birhanu", "last_name"=>"Hailemariam2", "email"=>"birhanuh4#gmail.com", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]", "current_password"=>"[FILTERED]"}, "commit"=>"Update User"}
User Load (0.7ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
Account Load (0.4ms) SELECT "public"."accounts".* FROM "public"."accounts" WHERE "public"."accounts"."subdomain" = $1 LIMIT 1 [["subdomain", "test3"]]
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1 [["id", 1]]
(0.3ms) BEGIN
(0.7ms) SELECT COUNT(*) FROM "users"
(0.3ms) ROLLBACK
Redirected to http://test3.lvh.me:3000/users/1
Completed 302 Found in 120ms (ActiveRecord: 4.5ms)
Started GET "/users/1" for 127.0.0.1 at 2016-12-11 18:34:51 +0200
views/devise/registrations/edit.slim
= simple_form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put }) do |f|
= f.input :first_name, autofocus: true
= f.input :last_name, autofocus: true
= f.input :email, autofocus: true
- if devise_mapping.confirmable? && resource.pending_reconfirmation?
div
|Currently waiting confirmation for: = resource.unconfirmed_email
.form-actions.col-sm-offset-3.m-b-xs
i
|(leave blank if you don't want to change it)
= f.input :password, autocomplete: "off"
= f.input :password_confirmation, autocomplete: "off"
.form-actions.col-sm-offset-3.m-b-xs
i
|(we need your current password to confirm your changes)
= f.input :current_password, autocomplete: "off"
.form-actions.form.col-sm-offset-3
=> link_to I18n.t('button.cancel'), :back, class: 'btn btn-primary btn-outline'
= f.button :submit, class: 'btn btn-primary'
controller/registrations_controller.rb
class RegistrationsController < Devise::RegistrationsController
protected
def update_resource(resource, user_params)
resource.update_with_password(user_params)
end
def after_update_path_for(resource)
current_account
end
end
controllers/application_controller.rb
class ApplicationController < ActionController::Base
.
.
before_filter :configure_permitted_parameters, if: :devise_controller?
protected
def configure_permitted_parameters
devise_parameter_sanitizer.permit(:accept_invitation, keys: [:first_name, :last_name])
devise_parameter_sanitizer.permit(:account_update, keys: [:first_name, :last_name, :email, :password, :password_confirmation,
:current_password])
end
.
.
end
routes:
devise_for :users, controllers: { registrations: 'registrations' }

Answer 1

I have managed to find what was causing the issue. It is because I have a private method that was returning false value to before_save ActiveRecord callback. Fact source: enter link description here
Previous version:
private
def set_admin
self.admin = User.count == 0
end
It should be changed to return nil in case of false value.
private
def set_admin
self.admin = User.count == 0
nil
end
Now everything works, I can update user info!