在lodash属性上合并/连接两个数组对象
是否有可能根据两个数组中存在的属性合并两个数组对象。
我想通过lodash lib来实现这个function。
例如，考虑id为PK的列表，以及catagoryId为FK的电影列表
电影类别数组：
[{ id: "cartoon", catagoryName:"Cartoon", },{ id: "drama", catagoryName:"Drama", },{ id: "action", catagoryName:"Action", }] 一些电影。
[{ categoryId:"action", movieName:"Spy", year: 2015 },{ categoryId:"drama", movieName:"San Andreas", year: 2015 },{ categoryId:"cartoon", movieName:"Rio", year: 2013 },{ categoryId:"action", movieName:"Jurassic World", year: 2015 }]
我正在通过下划线或lodash寻找的输出。
[{ id: "cartoon", catagoryName:"Cartoon", movies:[{ categoryId:"cartoon", movieName:"Rio", year: 2013 }] },{ id: "drama", catagoryName:"Drama", movies:[{ categoryId:"drama", movieName:"San Andreas", year: 2015 }] },{ id: "action", catagoryName:"Action", movies:[{ categoryId:"action", movieName:"Jurassic World", year: 2015 },{ categoryId:"action", movieName:"Spy", year: 2015 }] }]
我知道我可以做for循环，但想知道是否有更好的更清洁的方式。
任何build议可以帮助。 这是节点的js应用程序。
我用groupBy按类别对电影进行分组，然后通过扩展电影列表来map分类。
groupedMovies = _.groupBy(movies, 'categoryId'); _.map(categories, function(cat) { return _.extend({movies: groupedMovies[cat.id] || []}, cat); })
var categories = [{ id: "cartoon", catagoryName:"Cartoon", },{ id: "drama", catagoryName:"Drama", },{ id: "action", catagoryName:"Action", }]; var movies = [{ categoryId:"action", movieName:"Spy", year: 2015 },{ categoryId:"drama", movieName:"San Andreas", year: 2015 },{ categoryId:"cartoon", movieName:"Rio", year: 2013 },{ categoryId:"action", movieName:"Jurassic World", year: 2015 }]; groupedMovies = _.groupBy(movies, 'categoryId'); _.map(categories, function(cat) { return _.extend({movies: groupedMovies[cat.id] || []}, cat); }) document.write("<pre>" + JSON.stringify(groupedMovies, null, 2) + "</pre>");
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