如何在下划线/lodash中构建新数组

Question

我有以下 JSON 数据，包含嵌套数组

{
    "works": {
        "work": [
            {
                "id": "001",
                "filename": "image1.jpg",
                "urls": {   
                    "url": [
                        {
                            "_type": "small",
                            "__text": "small-image.jpg"
                        },
                        {
                            "_type": "medium",
                            "__text": "medium-image.jpg"
                        },
                        {
                            "_type": "large",
                            "__text": "large-image.jpg"
                        }
                    ]
                },
                "details": {
                    "flash": "0",
                    "model": "CAMERA MODEL 1",                    
                    "make": "CAMERA MAKE 1",                   
                }
            },

            {
                "id": "001",
                "filename": "image1.jpg",
                "urls": {   
                    "url": [
                        {
                            "_type": "small",
                            "__text": "small-image.jpg"
                        },
                        {
                            "_type": "medium",
                            "__text": "medium-image.jpg"
                        },
                        {
                            "_type": "large",
                            "__text": "large-image.jpg"
                        }
                    ]
                },
                "details": {
                    "flash": "0",
                    "model": "CAMERA MODEL 2",                    
                    "make": "CAMERA MAKE 2",                   
                }
            }                     
        ]
    }
}

我想重写数组，让它看起来像这样

[{
    "id": "001",
    "filename": "image1.jpg",
    "_type": "small",
    "url": "small-image.jpg",
    "model": "CAMERA MODEL 1",                    
    "make": "CAMERA MAKE 1"  
}, {
    "id": "002",
    "filename": "image2.jpg",
    "_type": "small",
    "url": "small-image.jpg",
    "model": "CAMERA MODEL 2",                    
    "make": "CAMERA MAKE 2"  
}]

我一直在阅读有关 Lodash 中的链接的信息，但到目前为止，实施它的运气并不好。到目前为止，这是我所得到的：

var flattened = _.chain(data).pluck("works")
         .concat(_.flatten(_(data).pluck("work")))
         .reject(_.isUndefined)
         .value()

任何帮助将不胜感激！

Answer 1

不确定您对使用纯链接有多在意，但如果您只关心将数据从一种格式转换为另一种格式，那么使用 lodash 地图可能会奏效。

_(source.works.work).map(function(item){
  var image = _(item.urls.url).find({'_type': 'small'});
  return {
    id: item.id,
    filename: item.filename,
    _type: image ? image._type : null,
    url: image ? image.__text : null,
    model: item.details.model,
    make: item.details.make
  };
}).value();

这将导致：

[ { id: '001',
    filename: 'image1.jpg',
    _type: 'small',
    url: 'small-image.jpg',
    model: 'CAMERA MODEL 1',
    make: 'CAMERA MAKE 1' },
  { id: '001',
    filename: 'image1.jpg',
    _type: 'small',
    url: 'small-image.jpg',
    model: 'CAMERA MODEL 2',
    make: 'CAMERA MAKE 2' } ]