小编Ano*_*bie的帖子

我有一个带列的模型:

from: { type: Sequelize.DATE }
to: { type: Sequelize.DATE }

并且想要查询fromOR to落在日期范围之间的所有记录:[startDate, endDate]

我尝试过类似的东西:

const where = {
      $or: [{
        from: {
          $lte: startDate,
          $gte: endDate,
        },
        to: {
          $lte: startDate,
          $gte: endDate,
        },
      }],
    };

类似于:来自MyTable WHERE的SELECT*(startDate <= from <= endDate)或(startDate <= to <= endDate

我有一系列从 API 获取的项目作为响应主体。

data = [{id: 1, category: "kitchen", name: "noodles"},
        {id: 2, category: "general", name: "Wi-Fi"},
        {id: 3, category: "sports", name: "Football"},]

我想遍历数组，并获得如下数据：

var categorized = {
 kitchen: [{id: 1, category: "kitchen", name: "noodles"}],
 general : [{id: 2, category: "general", name: "Wi-Fi"}],
 sports : [{id: 3, category: "sports", name: "Football"}]
};

是否有任何 lodash 方法或任何 ES6 快捷方式？

我有看起来像的JavaScript数组

问题是Object.mappings有3个元素清楚地打印在控制台中console.log()，但是当我尝试找到数组的长度时，它返回了0。我尝试对数组进行字符串化，它仅显示“ []”。

我在这里做错了什么？