Get NoMethodError in Devise::RegistrationsController#create - ruby-on-rails

Question

trying to add new users , using the devise gem
ran rake db:migrate and ran the rails server again
but when i type in 3000/posts/sign_up
it gives me the default sign up screen but when try to create a user i get
NoMethodError in Devise::RegistrationsController#create
undefined method `encrypted_password=' for #
my logs show
Started POST "/posts" for 127.0.0.1 at 2014-03-18 20:38:22 +0000
Processing by Devise::RegistrationsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"2uO2ttqAfK1a2C855cZOpDTsS2Duc7ZzVJxAQ5ObL8M=", "post"=>{"email"=>"neil#example.com", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]"}, "commit"=>"Sign up"}
Completed 500 Internal Server Error in 79ms
NoMethodError (undefined method `encrypted_password=' for #<Post:0x007fde3e09e538>):
activemodel (4.0.4) lib/active_model/attribute_methods.rb:439:in `method_missing'
activerecord (4.0.4) lib/active_record/attribute_methods.rb:167:in `method_missing'
devise (3.2.2) lib/devise/models/database_authenticatable.rb:42:in `password='
activerecord (4.0.4) lib/active_record/attribute_assignment.rb:42:in `public_send'
activerecord (4.0.4) lib/active_record/attribute_assignment.rb:42:in `_assign_attribute'
activerecord (4.0.4) lib/active_record/attribute_assignment.rb:29:in `block in assign_attributes'
activerecord (4.0.4) lib/active_record/attribute_assignment.rb:23:in `each'
activerecord (4.0.4) lib/active_record/attribute_assignment.rb:23:in `assign_attributes'
new.html.erb
<h2>Sign up</h2>
<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<div><%= f.label :email %><br />
<%= f.email_field :email, :autofocus => true %></div>
<div><%= f.label :password %><br />
<%= f.password_field :password %></div>
<div><%= f.label :password_confirmation %><br />
<%= f.password_field :password_confirmation %></div>
<div><%= f.submit "Sign up" %></div>
<% end %>
<%= render "devise/shared/links" %>
post.rb
class Post < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
end
rake routes
Prefix Verb URI Pattern Controller#Action
new_post_session GET /posts/sign_in(.:format) devise/sessions#new
post_session POST /posts/sign_in(.:format) devise/sessions#create
destroy_post_session DELETE /posts/sign_out(.:format) devise/sessions#destroy
post_password POST /posts/password(.:format) devise/passwords#create
new_post_password GET /posts/password/new(.:format) devise/passwords#new
edit_post_password GET /posts/password/edit(.:format) devise/passwords#edit
PATCH /posts/password(.:format) devise/passwords#update
PUT /posts/password(.:format) devise/passwords#update
cancel_post_registration GET /posts/cancel(.:format) devise/registrations#cancel
post_registration POST /posts(.:format) devise/registrations#create
new_post_registration GET /posts/sign_up(.:format) devise/registrations#new
edit_post_registration GET /posts/edit(.:format) devise/registrations#edit
PATCH /posts(.:format) devise/registrations#update
PUT /posts(.:format) devise/registrations#update
DELETE /posts(.:format) devise/registrations#destroy
posts GET /posts(.:format) posts#index
POST /posts(.:format) posts#create
new_post GET /posts/new(.:format) posts#new
edit_post GET /posts/:id/edit(.:format) posts#edit
post GET /posts/:id(.:format) posts#show
PATCH /posts/:id(.:format) posts#update
PUT /posts/:id(.:format) posts#update
DELETE /posts/:id(.:format) posts#destroy
about GET /about(.:format) pages#about
root GET / pages#welcome
rails g
Neils-MacBook-Pro:prospects neilpatel$ rails g devise:views
invoke Devise::Generators::SharedViewsGenerator
create app/views/devise/shared
create app/views/devise/shared/_links.erb
invoke form_for
create app/views/devise/confirmations
create app/views/devise/confirmations/new.html.erb
create app/views/devise/passwords
create app/views/devise/passwords/edit.html.erb
create app/views/devise/passwords/new.html.erb
create app/views/devise/registrations
create app/views/devise/registrations/edit.html.erb
create app/views/devise/registrations/new.html.erb
create app/views/devise/sessions
create app/views/devise/sessions/new.html.erb
create app/views/devise/unlocks
create app/views/devise/unlocks/new.html.erb
invoke erb
create app/views/devise/mailer
create app/views/devise/mailer/confirmation_instructions.html.erb
create app/views/devise/mailer/reset_password_instructions.html.erb
create app/views/devise/mailer/unlock_instructions.html.erb
Neils-MacBook-Pro:prospects neilpatel$ rails generate devise Post
invoke active_record
create db/migrate/20140318202353_add_devise_to_posts
insert app/models/post.rb
route devise_for :posts
Neils-MacBook-Pro:prospects neilpatel$ rake db:migrate

Answer 1

The main problem is here
NoMethodError (undefined method `encrypted_password=' for #<Post:0x007fde3e09e538>):
Check out you migration file. Is encrypted_password present or not? Do you have this t.string :encrypted_password, :null => false, :default => "" line of code in your migration file. And in your model file (i.e post.rb) you haven't define password attribute too.