javascript - 如何以编程方式向键相同的对象添加对象？

我正在使用underscore-query，它需要传入一个JSON对象来定义所有搜索子句。我需要通过一个循环构建对象，该循环从接口(interface)读取搜索值。我正在获取所有搜索值，但是我需要将它们转换为查询子句格式。这是一个示例循环:

var filterArray = [];
var filterObject = {};
for (var key in $scope.mpsfilters) {
    if ($scope.mpsfilters.hasOwnProperty(key)) {
        var keyparts = key.split('_');
        filterArray.push({
            $and: {
                "attribute_id": keyparts[0],
                "type": keyparts[1],
                "display_value": {$lte: $scope.mpsfilters[key].range_top, $gte: $scope.mpsfilters[key].range_bottom}
            }
        });
    }
}

for (var i = 0; i < filterArray.length; i++) {
    var filterStep = jQuery.extend({},filterObject, filterArray[i]);
    filterObject = filterStep;
}

我需要的最终结果应如下所示:

{
    $and: {
        "attribute_id": 2422,
        "type": "max",
        "display_value": {
            $lte: 200,
            $gte: 0.3
        }
    },
    $and: {
        "attribute_id": 2421,
        "type": "typ",
        "display_value": {
            $lte: 150,
            $gte: 50
        }
    }
    $and: {
        "attribute_id": 2750,
        "type": "min",
        "display_value": {
            $lte: 17,
            $gte: 2
        }
    }
}

我有两个使这个问题变得复杂的问题:

使用jQuery.extend()，angular.extend()，angular.merge()等的所有示例仅将两个对象组合为一个，并且都分配了已知变量。就我而言，它必须是动态的，因为搜索变量的数量可以变化。

我添加到主对象中的每个对象基本上都具有相同的键“$ and”。 extend()和merge()(合并是Angular 1.4的新增功能，它保留嵌套的对象)函数将仅更新相同的键，除非您传递空的{}对象作为第一个参数。这个最终对象将传递给它的过滤功能需要在上面显示的结构中。

我的代码现在的结果是这样的:

{
    $and: {
        "attribute_id": 2750,
        "type": "min",
        "display_value": {
            $lte: 17,
            $gte: 2
        }
    }
}

它似乎是替代而不是附加。我怎样才能将其追加？

最佳答案

您当前编写的查询将始终返回false。在没有合并修饰符的情况下，始终假定“和”(根据文档)。因此，您正在寻找attribute_id为2422、2421和2750的对象。

从逻辑上讲这是不可能的，因此我假设您的意思是以下内容(即使它仍然无效):

{
    $or: {
        $and: {
            "attribute_id": 2422,
            "type": "max",
            "display_value": {
                $lte: 200,
                $gte: 0.3
            }
        },
        $and: {
            "attribute_id": 2421,
            "type": "typ",
            "display_value": {
                $lte: 150,
                $gte: 50
            }
        }
        $and: {
            "attribute_id": 2750,
            "type": "min",
            "display_value": {
                $lte: 17,
                $gte: 2
            }
        }
    }
}

事实证明，即使文档从未说明，代码实际上也支持数组:

var models = [
  { x: 0, y: 0 },
  { x: 0, y: 1 },
  { x: 0, y: 2 },
  { x: 0, y: 3 },
  { x: 1, y: 0 },
  { x: 1, y: 1 },
  { x: 1, y: 2 },
  { x: 1, y: 3 }
];

var result = _.query( models, {
    $or: [
      { $and: { x: 0, y: 1 } },
      { $and: { x: 1, y: 0 } }
    ]
});

console.log( result );
// result = [ { x: 0, y: 0 }, { x: 1, y: 0 } ]

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因此，您实际上可以这样编写查询:

{
    $or: [
        { $and: {
            "attribute_id": 2422,
            "type": "max",
            "display_value": {
                $lte: 200,
                $gte: 0.3
            }
        } },
        { $and: {
            "attribute_id": 2421,
            "type": "typ",
            "display_value": {
                $lte: 150,
                $gte: 50
            }
        } },
        { $and: {
            "attribute_id": 2750,
            "type": "min",
            "display_value": {
                $lte: 17,
                $gte: 2
            }
        } }
    ]
}

这会使您的函数更加简单:

var filterArray = [];
var filterObject = {};
for (var key in $scope.mpsfilters) {
    if ($scope.mpsfilters.hasOwnProperty(key)) {
        var keyparts = key.split('_');
        filterArray.push({ $and: {
            "attribute_id": keyparts[0],
            "type": keyparts[1],
            "display_value": {$lte: $scope.mpsfilters[key].range_top, $gte: $scope.mpsfilters[key].range_bottom}
        }});
    }
}

// look how much easier this is!
filterObject = { $or: filterArray };