line_items_for フィルター（カート内の特定商品の行アイテムを抽出）

{
  "category": "cart",
  "deprecated": false,
  "deprecation_reason": "",
  "description": "Accepts the following object types:\n\n- `product`\n- `variant`",
  "parameters": [],
  "return_type": [
    {
      "type": "array",
      "name": "",
      "description": "",
      "array_value": "line_item"
    }
  ],
  "examples": [
    {
      "name": "",
      "description": "",
      "syntax": "",
      "path": "/products/bloodroot-whole",
      "raw_liquid": "{% assign product = all_products['bloodroot-whole'] %}\n{% assign line_items = cart | line_items_for: product %}\n\nTotal cart quantity for product: {{ line_items | sum: 'quantity' }}",
      "parameter": false,
      "display_type": "text",
      "show_data_tab": true
    },
    {
      "name": "",
      "description": "",
      "syntax": "",
      "path": "/products/bloodroot-whole",
      "raw_liquid": "{% assign product = all_products['bloodroot-whole'] %}\n{% assign variant = product.variants.first %}\n{% assign line_items = cart | line_items_for: variant %}\n\nTotal cart quantity for variant: {{ line_items | sum: 'quantity' }}",
      "parameter": false,
      "display_type": "text",
      "show_data_tab": true
    }
  ],
  "summary": "Returns the subset of [`cart`](https://shopify.dev/docs/api/liquid/objects/cart) line items that include a specified product or variant.",
  "syntax": "cart | line_items_for: object",
  "name": "line_items_for"
}