質問編集履歴
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参考データ添付しました
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@@ -29,3 +29,217 @@
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でviewにeach使用してproduct.total_countで各productがどれだけ売れたかはわかるのですが、ここに.order.limitとかで実装できると思ったのですがうまくいきませんでした。何かわかりそうな方いましたらとよろしくお願いいたします！
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☆追記
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上記total_countはメソッドです。なのでメソッドで引き出した値を並び替えたいという事です。
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以下参考データ添付させていただきます。
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schema.rb
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```
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ActiveRecord::Schema.define(version: 20180508113923) do
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create_table "carts", force: :cascade do |t|
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t.datetime "created_at", null: false
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t.datetime "updated_at", null: false
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end
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create_table "line_items", force: :cascade do |t|
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t.integer "product_id"
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t.integer "cart_id"
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t.datetime "created_at", null: false
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t.datetime "updated_at", null: false
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t.integer "quantity", default: 1
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t.integer "order_id"
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end
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create_table "orders", force: :cascade do |t|
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t.string "name"
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t.text "address"
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t.string "email"
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t.string "pay_type"
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t.datetime "created_at", null: false
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t.datetime "updated_at", null: false
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t.integer "user_id"
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t.integer "product_id"
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t.integer "quantity"
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end
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create_table "products", force: :cascade do |t|
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t.string "title"
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t.text "description"
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t.string "image_url"
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t.decimal "price", precision: 8, scale: 2
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t.datetime "created_at", null: false
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t.datetime "updated_at", null: false
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t.string "category_id"
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end
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create_table "users", force: :cascade do |t|
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t.string "name"
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t.string "password_digest"
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t.datetime "created_at", null: false
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t.datetime "updated_at", null: false
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t.string "email"
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t.string "reset_digest"
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t.datetime "reset_sent_at"
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t.boolean "admin", default: false
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end
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end
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```
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line_item.rb
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```
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class LineItem < ApplicationRecord
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belongs_to :order
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belongs_to :product
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belongs_to :cart
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def total_price
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product.price * quantity
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end
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end
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```
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product.rb
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```
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class Product < ApplicationRecord
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has_many :line_items
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has_many :orders, through: :line_items
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has_many :users, through: :favorites
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def total_count
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line_items.to_a.sum { |item| item.quantity}
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end
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end
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```
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order.rb
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```
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class Order < ApplicationRecord
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has_many :line_items, dependent: :destroy
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belongs_to :user
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def add_line_items_from_cart(cart)
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cart.line_items.each do |item|
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item.cart_id = nil
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line_items << item
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end
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end
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def total_price
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line_items.to_a.sum { |item| item.total_price }
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end
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def total_count
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line_items.to_a.sum { |item| item.quantity}
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end
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end
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```
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以上宜しくお願いしますm(._.)m
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