根据嵌套对象数组中的动态键过滤数组

时间:2019-02-15 16:32:55

标签: javascript arrays object filter ecmascript-6

我有一个带有嵌套对象的数组。像这样:

const results = [
    { 
        general: {
            orderID: '5567',
            created: 1548765626101,
            status: 'new'
        },

        company: {
            companyName: 'company x',
            companyEmail: 'info@companyx.com',
            companyContact: 'John Doe'
        },

        customer: {
            customerName: 'Jane Doe',
            customerEmail: 'janedoe@email.com'
        },

        products: [
            {
                productID: 4765756,
                productName: 'Product x',
                productDescription: 'Description for product x'
            },
            {
                productID: 4767839,
                productName: 'Product y',
                productDescription: 'Description for product y'
            }
        ],

        payment: {
            price: 1000,
            method: 'cash'
        }

    },
]

(为使结构保持一点点,我只为这个问题插入了一个结果对象。但是,我们说结果数组中有100个元素。)

用户可以输入搜索词并选中/取消选中包含或不包含这些键的键。键被硬编码在列表中。

例如。用户输入“ jane”,然后将customerName和customerEmail作为要搜索的键。或者用户输入“ x”并检查productName。

如何动态搜索这些选中的键?我已经在数组中具有选定的键。

因此,对于第一个示例,我有['customerName', 'customerEmail']

第二个是['productName']

我以前使用过array.filter()来处理硬编码键,但是我不知道如何过滤这些动态键。

有人可以帮我分解不同的步骤吗?我正在使用es6,没有外部库。

2 个答案:

答案 0 :(得分:1)

您需要遍历results数组,然后在每个对象中深度搜索匹配项。为此,您将需要

  • 获取所有键/值对
  • 如果值是对象,则进行更深入的搜索
  • 如果值是数组,则搜索每个项目更深
  • 否则(值是字符串或数字)
    • 如果键在要搜索的字段列表中
    • 如果值与查询匹配,则返回true
    • 否则返回false

类似的东西

const deepSearcher = (fields, query) =>
  function matcher(object) {
    const keys = Object.keys(object);

    return keys.some(key => {
      const value = object[key];
      // handle sub arrays
      if (Array.isArray(value)) return value.some(matcher);
      // handle sub objects
      if (value instanceof Object) return matcher(value);
      // handle testable values
      if (fields.includes(key)) {
        // handle strings
        if (typeof value === "string") return value.includes(query);
        // handle numbers
        return value.toString() === query.toString();
      }
      return false;
    });
  };

此函数创建一个与.filter方法一起使用的匹配器。

const customerFilter = deepSearcher(['customerName', 'customerEmail'], 'jane')
const found = results.filter(customerFilter);

或者您可以将其直接传递给.filter

const found = results.filter(deepSearcher(['customerName', 'customerEmail'], 'jane'));

您传递给deepSearcher的字段不必属于同一对象。匹配器将测试任何东西是否匹配(,但它们必须指向字符串/数字,此代码才能起作用。)


有效的测试用例

const results = [{
  general: {
    orderID: "5567",
    created: 1548765626101,
    status: "new"
  },
  company: {
    companyName: "company x",
    companyEmail: "info@companyx.com",
    companyContact: "John Doe"
  },
  customer: {
    customerName: "Jane Doe",
    customerEmail: "janedoe@email.com"
  },
  products: [{
      productID: 4765756,
      productName: "Product x",
      productDescription: "Description for product x"
    },
    {
      productID: 4767839,
      productName: "Product y",
      productDescription: "Description for product y"
    }
  ],
  payment: {
    price: 1000,
    method: "cash"
  }
}];

const deepSearcher = (fields, query) =>
  function matcher(object) {
    const keys = Object.keys(object);

    return keys.some(key => {
      const value = object[key];
      // handle sub arrays
      if (Array.isArray(value)) return value.some(matcher);
      // handle sub objects
      if (value instanceof Object) return matcher(value);
      // handle testable values
      if (fields.includes(key)) {
        // handle strings
        if (typeof value === "string") return value.includes(query);
        // handle numbers
        return value.toString() === query.toString();
      }
      return false;
    });
  };

const matchingCustomer = results.filter(deepSearcher(["customerName", "customerEmail"], 'jane'));
console.log('results with matching customer:', matchingCustomer.length);

const matchingProduct = results.filter(deepSearcher(["productName"], 'x'));
console.log('results with matching product:', matchingProduct.length);


const matchingPrice = results.filter(deepSearcher(["price"], '1000'));
console.log('results with matching price:', matchingPrice.length);

const nonMatchingPrice = results.filter(deepSearcher(["price"], '500'));
console.log('results with non matching price:', nonMatchingPrice.length);

答案 1 :(得分:0)

也许是这样?请记住,“ searchTerm”是类型敏感的。

用法:搜索(结果,['companyName','productName'],'x');

/**
 *  Returns an array of objects which contains at least one 'searchKey' whose value
 *  matches THE 'searchTerm'.
 */
function search( inp, searchKeys, searchTerm ) {
  let retArray = [];

  function rdp( inp, searchKeys, searchTerm ) {

    if ( Array.isArray(inp) ) {
      if (inp.length > 0) {
        inp.forEach(elem => {
            rdp( elem, searchKeys, searchTerm );
        });
      }
    }
    else {
      Object.keys( inp ).forEach( prop => {
          if ( Array.isArray( inp[ prop ] ) || ( typeof inp[ prop ] == 'object')) {
            rdp( inp[ prop ], searchKeys, searchTerm );
          }
          else {
            searchKeys.forEach( key => {
                if (( prop == key ) &&  //  key match
                    ( prop in inp)) {  //  search term found

                  switch ( typeof inp[prop] ) {
                    case 'string' : if (inp[ prop ].indexOf( searchTerm ) > -1) { retArray.push( inp ); } break;
                    case 'number' : if ( inp[ prop ] === searchTerm ) { retArray.push( inp ); } break;
                  }
                }
            });
          }
      });
    }
  }

  rdp( inp, searchKeys, searchTerm );

  return retArray;

}