ruby on rails でショッピング リストを実装しようとしています。データベースに 2 つのテーブルを作成しましproducts
たshopping_list
。私は製品に shopping_list の外部キー参照を与えましたproduct.shopping_list_id
。
ruby on rails でtotal products
現在を見つけようとしていますが、エラーが発生します。shopping list
私の create Shop スキーマは次のとおりです:-
class CreateShopSchema < ActiveRecord::Migration
def up
# --------------------
# Table Name: shopping_list
# --------------------
# Note: This is the base table that has details about an account.
# ---------------------------------------------------------------
create_table :shopping_lists do |t|
t.string :id, :null => false
t.string :shopping_list_name
t.string :shopping_list_status, :default => 'OPEN'
t.string :total_items, :default => 0
t.timestamps
end
# --------------------
# Table Name: products
# --------------------
# Note: This is the base table that has details about an account.
# ---------------------------------------------------------------
create_table :products do |t|
t.references :shopping_list, :null => false
t.string :product_name, :default => 'null'
t.string :product_category
t.integer :quantity
t.string :status, :default => 'OPEN'
end
end
def down
drop_table :products
drop_table :shopping_lists
end
end
私の shopping_list テーブルは次のとおりです:-
CREATE TABLE shopping_lists
(
id serial NOT NULL,
shopping_list_name character varying(255),
shopping_list_status character varying(255) DEFAULT 'OPEN'::character varying,
total_items character varying(255) DEFAULT 0,
created_at timestamp without time zone NOT NULL,
updated_at timestamp without time zone NOT NULL,
deleted integer NOT NULL DEFAULT 0,
CONSTRAINT shopping_lists_pkey PRIMARY KEY (id)
)
私の製品表は次のとおりです:-
CREATE TABLE products
(
id serial NOT NULL,
shopping_list_id integer NOT NULL,
product_name character varying(255) DEFAULT 'null'::character varying,
product_category character varying(255),
quantity integer,
status character varying(255) DEFAULT 'OPEN'::character varying,
deleted integer NOT NULL DEFAULT 0,
CONSTRAINT products_pkey PRIMARY KEY (id)
)
私の製品コントローラーは次のとおりです:-
class ProductsController < ApplicationController
# GET /products
# GET /products.json
def index
@products = Product.all
# @products = Product.includes(:shopping_list_id)
respond_to do |format|
format.html # index.html.erb
format.json { render json: @products }
end
end
# GET /products/1
# GET /products/1.json
def show
@product = Product.find(params[:id])
#product = Product.includes(:shopping_list_id)
#@product = Product.joins(:shopping_list_id)
respond_to do |format|
format.html # show.html.erb
format.json { render json: @product }
end
end
# GET /products/new
# GET /products/new.json
def new
@product = Product.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: @product }
end
end
# GET /products/1/edit
def edit
@product = Product.find(params[:id])
end
# POST /products
# POST /products.json
def create
@product = Product.new(params[:product])
respond_to do |format|
if @product.save
format.html { redirect_to @product, notice: 'Product was successfully created.' }
format.json { render json: @product, status: :created, location: @product }
else
format.html { render action: "new" }
format.json { render json: @product.errors, status: :unprocessable_entity }
end
end
end
# PUT /products/1
# PUT /products/1.json
def update
@product = Product.find(params[:id])
respond_to do |format|
if @product.update_attributes(params[:product])
format.html { redirect_to @product, notice: 'Product was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: @product.errors, status: :unprocessable_entity }
end
end
end
# DELETE /products/1
# DELETE /products/1.json
def delete
@product = Product.find(params[:id])
@product.deleted = 1
@product.save
respond_to do |format|
format.html { redirect_to products_url }
format.json { render :json => { :success => true } }
end
end
def list
@products = Product.find(:all,
:order => "id asc")
# @products = Product.includes(:shopping_list_id)
respond_to do |format|
format.html { render :action => 'list' }
format.json { render :json => @accounts.to_json }
end
end
end
フロント エンドを介してデータベースに新しい製品を追加しようとすると、製品テーブルが作成されますが、shopping_list の数量 (合計アイテム) がデータベースで更新されません。
特定の買い物リストの商品の数を取得できるように実装したい
誰でもこれを実装するのを手伝ってくれますか