Increment Item Quantity

Use the incrementItemQuantity mutation to increment only the cart item quantity.

Mutation

incrementItemQuantity(input: UpdateItemQuantityInput!): Cart!

Arguments	Type
`input`	`UpdateItemQuantityInput!`

The incrementItemQuantity mutation will always return the updated Cart object.

`UpdateItemQuantityInput!`

Argument	Type	Description
`cartId`	`ID!`	The `id` of the cart you are working with.
`id`	`ID!`	The `id` of the item you are incrementing the quantity of.
`by`	`Int!`	The amount you wish to increment the cart item quantity by.

If no cart item exists with the id provided, an error will be returned.

Example

mutation {
  incrementItemQuantity(
    input: { cartId: "ck5r8d5b500003f5o2aif0v2b", id: "5e3293a3462051", by: 10 }
  ) {
    id
    items {
      id
      quantity
    }
  }
}

{
  "data": {
    "incrementItemQuantity": {
      "id": "ck5r8d5b500003f5o2aif0v2b",
      "items": [
        {
          "id": "ck5r8d5b500003f5o2aif0v2b",
          "quantity": 11
        }
      ]
    }
  }
}