如何将两个JSON响应合并为一个结构中的一个

Question

此响应来自一个API调用。 JSON响应1：

{
"message": "success",
"data": [
    {
        "storeid": "91",
        "productid": "37",
        "cartitemid": 48,
        "product_quantity": 8
    },
    {
        "storeid": "86",
        "productid": "74",
        "cartitemid": 52,
        "product_quantity": 1
    },
    {
        "storeid": "86",
        "productid": "73",
        "cartitemid": 51,
        "product_quantity": 6
    },
    {
        "storeid": "86",
        "productid": "76",
        "cartitemid": 50,
        "product_quantity": 1
    }
]
}

这是第二个API调用。

JSON响应2：

{
"data": [
    {
        "storeid": 91,
        "productid": 37,
        "product_name": "hhh"
    },
    {
        "storeid": 86,
        "productid": 73,
        "product_name": "dfsdfsd"
    },
    {
        "storeid": 86,
        "productid": 76,
        "product_name": "dfsdfsd"
    }
]
}

我需要此输出，因为我需要将此JSON解析到我的模型中。

和输出：

{
"storeInfo": [
    {
        "storeid": 91,
        "products": [
            {
                "productid": 37,
                "product_name": "hhh",
                "prod_images": "https://sdfsd.com"
            }
        ]
    },
    {
        "storeid": 86,
        "products": [
            {
                "productid": 73,
                "product_name": "ghgjhhj",
                "prod_images": "https://hjhjh.com"
            },
            {
                "productid": 76,
                "product_name": "reer",
                "prod_images": "https://hjhjh.com"
            }
        ]
    }
]
}

请建议如何以这种格式制作输出JSON？ 我已经尝试了多种方法来合并两个JSON并将其输出以这种方式。什么都没有解决。这是否会发生在后背上还是在我们的前端手中？

Answer 1

该输出模型必须在API输出级别上构建。

Answer 2

这确实是后端的东西。但是，如果您仍然需要它，则以下代码应在前端方面解决问题。

MERGE函数在JSON1和JSON2上合并了两个产品的所有属性，然后使用提供的JSON模板格式化输出。

查看

import 'dart:convert';

final json1 = {
  "message": "success",
  "data": [
    {
      "storeid": "91",
      "productid": "37",
      "cartitemid": 48,
      "product_quantity": 8
    },
    {
      "storeid": "86",
      "productid": "74",
      "cartitemid": 52,
      "product_quantity": 1
    },
    {
      "storeid": "86",
      "productid": "73",
      "cartitemid": 51,
      "product_quantity": 6
    },
    {
      "storeid": "86",
      "productid": "76",
      "cartitemid": 50,
      "product_quantity": 1
    }
  ]
};

final json2 = {
  "data": [
    {"storeid": 91, "productid": 37, "product_name": "hhh"},
    {"storeid": 86, "productid": 73, "product_name": "dfsdfsd"},
    {"storeid": 86, "productid": 76, "product_name": "dfsdfsd"}
  ]
};

Map<String, dynamic> merge(
    Map<String, dynamic> cart, Map<String, dynamic> namedProducts) {
  final products = <String, Map<String, dynamic>>{};

  // include all cart products
  List<Map<String, dynamic>> cartData = cart['data'];
  for (final p in cartData) {
    final product = {
      ...p,
      'productid': int.parse(p['productid']),
      'storeid': int.parse(p['storeid']),
    };

    products.update(
      '${p['storeid']}:${p['productid']}',
      (value) => {
        ...value,
        ...product,
      },
      ifAbsent: () => product,
    );
  }

  // include all named products
  List<Map<String, dynamic>> namedProductsData = namedProducts['data'];
  for (final p in namedProductsData) {
    products.update(
      '${p['storeid']}:${p['productid']}',
      (value) => {
        ...value,
        ...p,
      },
      ifAbsent: () => {...p},
    );
  }

  // group products by `storeid`
  final storeProducts = <int, List<dynamic>>{};
  products.forEach((key, p) {
    storeProducts.update(
      p['storeid'],
      (value) => [...value, p],
      ifAbsent: () => [p],
    );
  });

  // build final `storeInfo` data
  final storeInfo = <String, dynamic>{
    'storeInfo': [
      for (final entry in storeProducts.entries)
        {
          'storeid': entry.key,
          'products': entry.value,
        }
    ],
  };

  return storeInfo;
}

void main() {
  final storeInfo = merge(json1, json2);
  JsonEncoder encoder = JsonEncoder.withIndent('  ');
  String prettyprint = encoder.convert(storeInfo);
  print(prettyprint);
}

”

{
  "storeInfo": [
    {
      "storeid": 91,
      "products": [
        {
          "storeid": 91,
          "productid": 37,
          "cartitemid": 48,
          "product_quantity": 8,
          "product_name": "hhh"
        }
      ]
    },
    {
      "storeid": 86,
      "products": [
        {
          "storeid": 86,
          "productid": 74,
          "cartitemid": 52,
          "product_quantity": 1
        },
        {
          "storeid": 86,
          "productid": 73,
          "cartitemid": 51,
          "product_quantity": 6,
          "product_name": "dfsdfsd"
        },
        {
          "storeid": 86,
          "productid": 76,
          "cartitemid": 50,
          "product_quantity": 1,
          "product_name": "dfsdfsd"
        }
      ]
    }
  ]
}