javascript - lodash:对象的深度合并

Question

我想从这个对象合并对象:

objs = {
  one: { description: "value", amount: 5, value: { description: "value desc", identifier: "some text"} },
  two: { description: "value", amount: 5, value: { description: "value desc", identifier: "some text"} }
}

进入这个对象:

objs = {
  one: { original_description: "value", amount: 5, description: "value desc", identifier: "some text" },
  two: { original_description: "value", amount: 5, description: "value desc", identifier: "some text" }
}

UPD:来自 @ryeballar 的解决方案正在工作，但我发现问题，“子对象”包含与父对象相同的键名称。

Answer 1

您可以使用mapValues() ，并有一个回调，通过使用 omit() 返回每个带有省略值的对象。和 merge()它与该值本身。

var objs = {
  one: { description: "value", amount: 5, value: { identifier : "some text"} },
  two: { description: "value", amount: 5, value: { identifier : "some text"} }
};

var result = _.mapValues(objs, i => _(i).omit('value').merge(i.value).value());
               
document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');  

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.11.2/lodash.js"></script>

更新

为了响应您的更新，您仍然可以使用上面的原始解决方案，只需在使用 mapKeys() 的地方进行一些调整即可。如果合并源中存在给定前缀，则转换每个对象键。

var objs = {
  one: { description: "value", amount: 5, value: { description: "value desc", identifier: "some text"} },
  two: { description: "value", amount: 5, value: { description: "value desc", identifier: "some text"} },
  three: { description: "value", amount: 5, value: null },
  four: { description: "value", amount: 5 }
}

function mergeFromKey(object, mergeKey, prefix) {
  return _.mapValues(object, item => 
    _(item).mapKeys((v, k) => (_.get(item[mergeKey], k)? prefix: '') + k)
    .omit(mergeKey)
    .merge(item[mergeKey])
    .value()
  );
}

var result = mergeFromKey(objs, 'value', 'original_');

document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.11.2/lodash.js"></script>