addConfigurableProductToCart Fails Adding Multiple Items

[pmclain]

Preconditions (*)

1. Create configurable product with at least two variants

Steps to reproduce (*)

1. Create empty cart
2. Execute mutation adding multiple variants to empty cart

mutation addConfigurableProductsToCart($cartId:String!) {
  addConfigurableProductsToCart(input:{
    cart_id:$cartId
    cart_items:[
      {
        parent_sku:"Configurable Product 1"
        data:{
          sku:"Configurable Product 1 - option 1"
          quantity:2
        }
      },
      {
        parent_sku:"Configurable Product 1"
        data:{
          sku:"Configurable Product 1 - option 2"
          quantity:1
        }
      }
    ]
  }) {
    cart {
      items {
        id
        quantity
        product {
          sku
        }
        ... on ConfigurableCartItem {
          configurable_options {
            option_label
            value_label
          }
        }
      }
    }
  }
}

Expected result (*)

Response contains requested items and their respective quantities

{
  "data": {
    "addConfigurableProductsToCart": {
      "cart": {
        "items": [
          {
            "id": "1",
            "quantity": 2,
            "product": {
              "sku": "Configurable Product 1"
            },
            "configurable_options": [
              {
                "option_label": "Dynamic Attribute ca_1_631447041",
                "value_label": "option 1"
              },
              {
                "option_label": "Dynamic Attribute ca_2_631447041",
                "value_label": "option 1"
              }
            ]
          },
          {
            "id": "4",
            "quantity": 1,
            "product": {
              "sku": "Configurable Product 1"
            },
            "configurable_options": [
              {
                "option_label": "Dynamic Attribute ca_1_631447041",
                "value_label": "option 1"
              },
              {
                "option_label": "Dynamic Attribute ca_2_631447041",
                "value_label": "option 2"
              }
            ]
          }
        ]
      }
    }
  }
}

Actual result (*)

A single item is added to the cart with a quantity of the summed request item quantities

{
  "data": {
    "addConfigurableProductsToCart": {
      "cart": {
        "items": [
          {
            "id": "1",
            "quantity": 3,
            "product": {
              "sku": "Configurable Product 1"
            },
            "configurable_options": [
              {
                "option_label": "Dynamic Attribute ca_1_631447041",
                "value_label": "option 1"
              },
              {
                "option_label": "Dynamic Attribute ca_2_631447041",
                "value_label": "option 1"
              }
            ]
          }
        ]
      }
    }
  }
}

[pmclain]

This is only reproducible when adding multiple variants of the same configurable SKU. This works as expected when the configurable SKUs are different.

[TomashKhamlai]

@lenaorobei, not a bug, I believe. On Storefront the dropdown menu is not of the type "multiple" it is an ordinary select menu. Customer is able to select more than 1 variation but in this case, Customer has to add the product to the cart twice.