Adds cart service skeleton

packages/medusa/src/models/__mocks__/cart.js

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+import IdMap from "../../helpers/id-map"
+
+export const carts = {
+  emptyCart: {
+    _id: IdMap.getId("emptyCart"),
+    title: "test",
+    region: IdMap.getId("testRegion"),
+    items: [],
+    shippingAddress: {},
+    billingAddress: {},
+    discounts: [],
+    customer_id: "",
+  },
+}
+
+export const CartModelMock = {
+  create: jest.fn().mockReturnValue(Promise.resolve()),
+  updateOne: jest.fn().mockImplementation((query, update) => {
+    return Promise.resolve()
+  }),
+  deleteOne: jest.fn().mockReturnValue(Promise.resolve()),
+  findOne: jest.fn().mockImplementation(query => {
+    if (query._id === IdMap.getId("emptyCart")) {
+      return Promise.resolve(carts.emptyCart)
+    }
+    return Promise.resolve(undefined)
+  }),
+}

packages/medusa/src/models/cart.js

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+/*******************************************************************************
+ * models/product-variant.js
+ *
+ ******************************************************************************/
+import mongoose from "mongoose"
+import { BaseModel } from "../interfaces"
+
+import LineItemSchema from "./schemas/line-item"
+import AddressSchema from "./schemas/address"
+
+class CartModel extends BaseModel {
+  static modelName = "Cart"
+
+  static schema = {
+    email: { type: String },
+    billingAddress: { type: AddressSchema },
+    shippingAddress: { type: AddressSchema },
+    items: { type: [LinetItemSchema], default: [] },
+    region: { type: String, required: true },
+    discounts: { type: [String], default: true },
+    customer_id: { type: String },
+  }
+}
+
+export default CartModel

packages/medusa/src/models/schemas/address.js

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+/*******************************************************************************
+ *
+ ******************************************************************************/
+import mongoose from "mongoose"
+
+export default new mongoose.Schema({
+  first_name: { type: String, required: true },
+  last_name: { type: String, required: true },
+  address1: { type: String, required: true },
+  address2: { type: String },
+  city: { type: String, required: true },
+  country_code: { type: String, required: true },
+  province: { type: String },
+  postal_code: { type: String, required: true },
+  metadata: { type: mongoose.Schema.Types.Mixed, default: {} },
+})

packages/medusa/src/models/schemas/line-item.js

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+/*******************************************************************************
+ *
+ ******************************************************************************/
+import mongoose from "mongoose"
+
+export default new mongoose.Schema({
+  title: { type: String, required: true },
+  description: { type: String },
+  thumbnail: { type: String },
+
+  // mongoose doesn't allow multi-type validation but this field allows both
+  // an object containing:
+  // {
+  //   variant: (ProductVariantSchema),
+  //   product: (ProductSchema)
+  // }
+  //
+  // and and array containing:
+  // [
+  //   {
+  //     variant: (ProductVariantSchema),
+  //     product: (ProductSchema)
+  //   }
+  // ]
+  // validation is done in the cart service.
+  content: { type: mongoose.Schema.Types.Mixed, required: true },
+  quantity: { type: Number, required: true },
+  metadata: { type: mongoose.Schema.Types.Mixed, default: {} },
+})