ActiveRecord::StatementInvalid in Products#index - ruby-on-rails

Question

I am new to rails 4.I used nested attributes for multiple image upload.But i'm having few problems with this
im getting ActiveRecord::StatementInvalid in Products#index
Mysql2::Error: Unknown column 'pictures.product_id' in 'where clause': SELECT pictures. FROM pictures WHERE pictures.product_id = 11* error
My models are as follows
class Picture < ActiveRecord::Base
belongs_to :product
has_attached_file :image
end
class Product < ActiveRecord::Base
belongs_to :user
belongs_to :category
has_many :comments , dependent: :destroy
has_many :pictures
accepts_nested_attributes_for :pictures
end
products_controller.rb
class ProductsController < ApplicationController
def show
#product = Product.find(params[:id])
#comment = #product.comments.build
#category_id = #product.category_id
#category1 = Category.find_by(id: #category_id)
end
def new
#product = current_user.products.build
#product.pictures.build
end
def create
#product = current_user.Product.new(product_params)
#product.save
respond_to do |format|
if #product.save
format.html { redirect_to #product, notice: 'Product was successfully created.' }
format.json { render :show, status: :created, location: #product }
else
format.html { render :new }
format.json { render json: #product.errors, status: :unprocessable_entity }
end
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_product
#product = Product.find(params[:id])
end
def product_params
params.require(:product).permit(:name, :price, :description, :reason, :user_id,:status,:category_id,pictures_attributes: [:image])
end
def correct_user
#product = current_user.products.find_by(id: params[:id])
redirect_to root_url if #product.nil?
end
end
Schema.rb
ActiveRecord::Schema.define(version: 20151226132302) do
create_table "pictures", force: :cascade do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "products", force: :cascade do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "name", limit: 255
t.integer "price", limit: 4
t.text "description", limit: 65535
t.text "reason", limit: 65535
t.integer "user_id", limit: 4
t.string "image_file_name", limit: 255
t.string "image_content_type", limit: 255
t.integer "image_file_size", limit: 4
t.datetime "image_updated_at"
t.string "status", limit: 255
t.integer "category_id", limit: 4
t.integer "product_id", limit: 4
end
end
My migration file
20151226132302_add_product_id_to_product.rb
class AddProductIdToPictures < ActiveRecord::Migration
def change
add_reference :pictures, :product, index: true
end
end
Even with above migration product_id is not added to pictures model.
Can somebody help me with this?
It will be helpful if someone can give me nice reference for RAILS 4

Answer 1

unknown attribute 'product_id'
Suggests you don't have the product_id column in your pictures table.
If you're using has_many / belongs_to, you'll need to set the foreign_key for your belongs_to model in its table:
If you don't have the product_id column in your pictures table, you'll need to use the following:
$ rails g migration AddProductIdToPictures
# db/migrate/add_product_id_to_pictures_________.rb
class AddProductIdToPictures < ActiveRecord::Migration
def change
add_reference :pictures, :product, index: true
end
end
$ rake db:migrate
Ref: Add a reference column migration in Rails 4
Another issue you may have is that you're using .build in the new method. I know that new and build have very little difference, but I was under the impression to use new:
def new
#product = current_user.products.new
#product.pictures.build
end
You've also got an error in your create action:
def create
#NO - #product = current_user.Product.new(product_params) #-> cannot use constant
#Should be this:
#product = current_user.products.new
#product.save
end