NoMethodError undefined method - ruby-on-rails

Question

I'm doing a website similar to Pinterest, but when I try that the users save the pins according to their id I get this error.. I´m using Rails 4... ¿How I fix this error?
NoMethodError in PinsController#create
undefined method `user_id=' for nil:NilClass
controllers/pins_controllers.rb
# POST /pins.json
def create
#pin.user_id = current_user.id
#pin = Pin.new(pin_params)
respond_to do |format|
end
model/pin.rb
class Pin < ActiveRecord::Base
belongs_to :user
validates :photo, presence:true
validates :description, presence:true
end
config/routes.rb
Pinterest::Application.routes.draw do
resources :pins
devise_for :users
root 'pages#index'
end
app/controllers/pins_controller.rb
class PinsController < ApplicationController
before_action :set_pin, only: [:show, :edit, :update, :destroy]
before_filter :authenticate_user!, except: [:index, :show]
# GET /pins
# GET /pins.json
def index
#pins = Pin.all
end
# GET /pins/1
# GET /pins/1.json
def show
end
# GET /pins/new
def new
#pin = Pin.new
end
# GET /pins/1/edit
def edit
end
# POST /pins
# POST /pins.json
def create
#pin = Pin.new(pin_params)
#pin.user_id = current_user.id
respond_to do |format|
if #pin.save
format.html { redirect_to #pin, notice: 'Pin was successfully created.' }
format.json { render action: 'show', status: :created, location: #pin }
else
format.html { render action: 'new' }
format.json { render json: #pin.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /pins/1
# PATCH/PUT /pins/1.json
def update
respond_to do |format|
if #pin.update(pin_params)
format.html { redirect_to #pin, notice: 'Pin was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #pin.errors, status: :unprocessable_entity }
end
end
end
# DELETE /pins/1
# DELETE /pins/1.json
def destroy
#pin.destroy
respond_to do |format|
format.html { redirect_to pins_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_pin
#pin = Pin.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def pin_params
params.require(:pin).permit(:name, :photo, :description)
end
end
db/migrate/schema.rb
ActiveRecord::Schema.define(version: 20140308225255) do
create_table "pins", force: true do |t|
t.string "photo"
t.string "description"
t.datetime "created_at"
t.datetime "updated_at"
t.string "name"
end
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"
t.string "phone"
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
How I fix this error?
NoMethodError in PinsController#create undefined methoduser_id=' for nil:NilClass`

Answer 1

Your action should be changed to:
# POST /pins.json
def create
#pin = Pin.new(pin_params)
#pin.user_id = current_user.id
end
Because you didn't create instance of Pin and want to assign value to it.