How to resolve "ActiveModel::ForbiddenAttributesError" Error - ruby-on-rails

Question

I got the following error when I clicked on the "Create user" button.
Error:
ActiveModel::ForbiddenAttributesError
Extracted source (around line #27):
25 # POST /users.json
26 def create
27 #user = User.new(params[:user])
28 respond_to do |format|
29 if #user.save
I am following the below reference link and typed same command and same code given.
http://railscasts.com/episodes/206-action-mailer-in-rails-3?view=asciicast
My code snippets are described below.
In app/controller/user_controller.rb
class UsersController < ApplicationController
before_action :set_user, only: [:show, :edit, :update, :destroy]
# GET /users
# GET /users.json
def index
#users = User.all
end
# GET /users/1
# GET /users/1.json
def show
end
# GET /users/new
def new
#user = User.new
end
# GET /users/1/edit
def edit
end
# POST /users
# POST /users.json
def create
#user = User.new(params[:user])
respond_to do |format|
if #user.save
UserMailer.registration_confirmation(#user).deliver
format.html { redirect_to(#user, :notice => 'User was successfully created.') }
format.xml { render :xml => #user, :status => :created, :location => #user }
else
format.html { render :action => "new" }
format.xml { render :xml => #user.errors, :status => :unprocessable_entity }
end
end
end
# PATCH/PUT /users/1
# PATCH/PUT /users/1.json
def update
respond_to do |format|
if #user.update(user_params)
format.html { redirect_to #user, notice: 'User was successfully updated.' }
format.json { render :show, status: :ok, location: #user }
else
format.html { render :edit }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.json
def destroy
#user.destroy
respond_to do |format|
format.html { redirect_to users_url, notice: 'User was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
#user = User.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def user_params
params.require(:user).permit(:name, :email)
end
end
In config/initializer/setup_mail.rb
ActionMailer::Base.smtp_settings = {
:address => "smtp.gmail.com",
:port => 587,
:domain => "gmail.com",
:user_name => "w5call.w5rtc#gmail.com",
:password => "w5rtc123#",
:authentication => "plain",
:enable_starttls_auto => true
}
In app/mailer/user_mailer.rb
class UserMailer < ActionMailer::Base
default :from => "w5call.w5rtc#gmail.com"
def registration_confirmation(user)
mail(:to => user.email, :subject => "Registered", :from => "w5call.w5rtc#gmail.com")
end
end
app\views\user_mailer\registration_confirmation.text.erb
<%= #user.name %>,
Thank you for registering!
Please help me for resolve this error as i am totaly new to ROR. Thanks in Advance.

Answer 1

In Rails 4 there is concept of Strong Parameter.
Strong Parameter in rails
To fixed this issue you need to change you create method and call #user = User.new(user_params) methods instead.

Answer 2

Change
def create
#user = User.new(params[:user])
to
def create
#user = User.new(user_params)