Devise - undefined method: username - ruby-on-rails

Question

Learning rails, using the treehouse videos to build a simple social network.
After making the following changes to add additional fields to devise:
new.html.erb (New Registration)
<div><%= f.label :username %><br>
<%= f.text_field :username %></div>
devise_create_users migration file
t.string :username,
t.string :email, null: false, default: ""
t.string :encrypted_password, null: false, default: ""
I use rake db:reset and then rake db:migrate to attempt to initiate the database changes however the schema remains the same, without the username field.
I get the error: undefined method `username' for #
On the line:
<%= f.text_field :username %></div>
Any help really appreciated, not sure if this is a version related issue or whether treehouse has left out some information.
Thanks!
Devise Migration:
class DeviseCreateUsers < ActiveRecord::Migration
def change
create_table(:users) do |t|
## Database authenticatable
t.string :username,
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.string :current_sign_in_ip
t.string :last_sign_in_ip
## Confirmable
# t.string :confirmation_token
# t.datetime :confirmed_at
# t.datetime :confirmation_sent_at
# t.string :unconfirmed_email # Only if using reconfirmable
## Lockable
# t.integer :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
# t.string :unlock_token # Only if unlock strategy is :email or :both
# t.datetime :locked_at
t.timestamps
end
add_index :users, :email, unique: true
add_index :users, :reset_password_token, unique: true
# add_index :users, :confirmation_token, unique: true
# add_index :users, :unlock_token, unique: true
end
end
schema:
# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20140720141519) do
create_table "articles", force: true do |t|
t.string "name"
t.string "title"
t.text "content"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "comments", force: true do |t|
t.string "name"
t.text "body"
t.integer "article_id"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "comments", ["article_id"], name: "index_comments_on_article_id"
create_table "users", force: true do |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.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end

Answer 1

You have a typo in your migration. Comma is not needed at the end of line
t.string :username,
As I see there is no username column in users table in your schema. Just remove the comma and recreate you database with $ rake db:drop && rake db:create && rake db:migrate.