node.js - 使用lodash中的键值合并对象数组？

Question

我正在使用 Node.js 和 lodash。

我有这样的数据:

[ 
  { 
    to: [ 'foo@bar.com', 'foo1@bar.com' ],
    submittedSubs: [ [Object] ] 
  },
  { 
    to: [ 'foo@bar.com', 'foo2@bar.com' ],
    submittedSubs: [ [Object], [Object], [Object] ] 
  } 
]

我想将其转换为这样的数据，其中按 to“排序”

[ 
  { 
    to: 'foo@bar.com', 
    submittedSubs: [ [Object],[Object], [Object], [Object] ] 
  },
  { 
    to: 'foo1@bar.com', 
    submittedSubs: [ [Object] ] 
  },
  { 
    to: 'foo2@bar.com',
    submittedSubs: [ [Object], [Object], [Object] ] 
  }
]

我该怎么做？

我已经尝试过这个:

spam[0].to.push('foo@bar.com');  
spam[0].to.push('foo1@bar.com'); 
spam[1].to.push('foo@bar.com');  
spam[1].to.push('foo2@bar.com'); 

console.log('data is',spam);

var byUser=[];
_.each(spam, function(data){
    _.each(data.to,function(addr){
        byUser.push({to:addr,submittedSubs:data.submittedSubs});
    });
});
console.log('attempt',_.merge(byUser));

但这给了我这个:

[ { to: 'foo@bar.com', submittedSubs: [ [Object] ] },
{ to: 'foo1@bar.com', submittedSubs: [ [Object] ] },
{ to: 'foo@bar.com', submittedSubs: [ [Object], [Object], [Object] ] },
{ to: 'foo2@bar.com', submittedSubs: [ [Object], [Object], [Object] ] } ]

Answer 1

这对你有用:

var unique = {};
byUser.forEach(function(user) {
    unique[user.to] = unique[user.to] || [];
    unique[user.to] = unique[user.to].concat(user.submittedSubs);
});
unique = Object.keys(unique).map(function (key, i) {
    return {to: key, submittedSubs: unique[key]};
});

/*
[ { to: 'foo@bar.com', submittedSubs: [ [Object] ] },
{ to: 'foo1@bar.com', submittedSubs: [ [Object] ] },
{ to: 'foo2@bar.com', submittedSubs: [ [Object], [Object], [Object], [Object] ] } ]
*/

<小时/>

我坚持认为，使用 _.uniq 的回调功能应该可以实现这一点，但我无法让它按照您需要的方式工作。

您应该能够使用_.uniq来自lodash在你的最终数组上:

_.uniq(byUser, "to");

/*
[ { to: 'foo@bar.com', submittedSubs: [ [Object] ] },
{ to: 'foo1@bar.com', submittedSubs: [ [Object] ] },
{ to: 'foo2@bar.com', submittedSubs: [ [Object], [Object], [Object] ] } ]
*/