reactioncommerce · aldeed · Aug 13, 2018 · Aug 10, 2018 · Aug 10, 2018 · Aug 10, 2018
diff --git a/imports/plugins/core/graphql/server/no-meteor/resolvers/cart/Cart/index.js b/imports/plugins/core/graphql/server/no-meteor/resolvers/cart/Cart/index.js
@@ -2,11 +2,13 @@ import { encodeCartOpaqueId } from "@reactioncommerce/reaction-graphql-xforms/ca
 import { resolveAccountFromAccountId, resolveShopFromShopId } from "@reactioncommerce/reaction-graphql-utils";
 import checkout from "./checkout";
 import items from "./items";
+import totalItemQuantity from "./totalItemQuantity";
 
 export default {
   _id: (node) => encodeCartOpaqueId(node._id),
   account: resolveAccountFromAccountId,
   checkout,
   items,
-  shop: resolveShopFromShopId
+  shop: resolveShopFromShopId,
+  totalItemQuantity
 };
diff --git a/imports/plugins/core/graphql/server/no-meteor/resolvers/cart/Cart/totalItemQuantity.js b/imports/plugins/core/graphql/server/no-meteor/resolvers/cart/Cart/totalItemQuantity.js
@@ -0,0 +1,17 @@
+import { xformTotalItemQuantity } from "@reactioncommerce/reaction-graphql-xforms/cart";
+
+/**
+ * @name "Cart.totalItemQuantity"
+ * @method
+ * @memberof Cart/GraphQL
+ * @summary Calculates the total quantity of items in the cart and returns a number
+ * @param {Object} cart - Result of the parent resolver, which is a Cart object in GraphQL schema format
+ * @param {Object} connectionArgs - Connection args. (not used for this resolver)
+ * @param {Object} context - An object containing the per-request state
+ * @return {Promise<Number>} A promise that resolves to the number of the total item quantity
+ */
+export default async function totalItemQuantity(cart, connectionArgs, context) {
+  if (!Array.isArray(cart.items)) return 0;
+
+  return xformTotalItemQuantity(context.collections, cart.items);
+}
diff --git a/imports/plugins/core/graphql/server/no-meteor/resolvers/xforms/cart.js b/imports/plugins/core/graphql/server/no-meteor/resolvers/xforms/cart.js
@@ -323,3 +323,13 @@ export async function xformCartCheckout(collections, cart) {
     }
   };
 }
+
+/**
+ * @param {Object} collections Map of Mongo collections
+ * @param {Object} items Cart items
+ * @returns {Number} Total quantity of all items in the cart
+ */
+export async function xformTotalItemQuantity(collections, items) {
+  // Total item quantity comes from the sum of the quantities of each item
+  return (items || []).reduce((sum, item) => (sum + item.quantity), 0);
+}
diff --git a/imports/plugins/core/graphql/server/no-meteor/schemas/cart.graphql b/imports/plugins/core/graphql/server/no-meteor/schemas/cart.graphql
@@ -19,6 +19,9 @@ type Cart implements Node {
   "The shop that owns the cart."
   shop: Shop!
 
+  "Total quantity of all items in the cart"
+  totalItemQuantity: Int!
+
   "The date and time at which this cart was last updated."
   updatedAt: DateTime!