如何使用lodash通过ID合并两个对象数组? [英] How to merge two arrays of objects by ID using lodash?
问题描述
我有两个数组,其中一个公共字段为 member .如何轻松合并主题?
I have two array with one common field member. how can I merge theme easily?
例如:
var arr1 = [{
"member" : ObjectId("57989cbe54cf5d2ce83ff9d6"),
"bank" : ObjectId("575b052ca6f66a5732749ecc"),
"country" : ObjectId("575b0523a6f66a5732749ecb")
},
{
"member" : ObjectId("57989cbe54cf5d2ce83ff9d8"),
"bank" : ObjectId("575b052ca6f66a5732749ecc"),
"country" : ObjectId("575b0523a6f66a5732749ecb")
}];
var arr2 = [{
"member" : ObjectId("57989cbe54cf5d2ce83ff9d6"),
"name" : 'xxxxxx',
"age" : 25
},
{
"member" : ObjectId("57989cbe54cf5d2ce83ff9d8"),
"name" : 'yyyyyyyyyy',
"age" : 26
}];
预期:
var merge = [{
"member" : ObjectId("57989cbe54cf5d2ce83ff9d6"),
"bank" : ObjectId("575b052ca6f66a5732749ecc"),
"country" : ObjectId("575b0523a6f66a5732749ecb"),
"name" : 'xxxxxx',
"age" : 25
},
{
"member" : ObjectId("57989cbe54cf5d2ce83ff9d8"),
"bank" : ObjectId("575b052ca6f66a5732749ecc"),
"country" : ObjectId("575b0523a6f66a5732749ecb"),
"name" : 'yyyyyyyyyy',
"age" : 26
}];
我尝试了
var merge = _.unionBy(arr1, arr2, 'member');
,但未按预期合并.显示 array1 值.有人可以帮我吗?
but not merged as expected. shown array1 value. can any one help me?
推荐答案
如果两个数组的顺序正确;每个项目都与其关联的成员标识符相对应,则您可以简单地使用.
If both arrays are in the correct order; where each item corresponds to its associated member identifier then you can simply use.
var merge = _.merge(arr1, arr2);
以下是哪个的简短版本:
Which is the short version of:
var merge = _.chain(arr1).zip(arr2).map(function(item) {
return _.merge.apply(null, item);
}).value();
或者,如果数组中的数据不是按特定顺序排列,则可以按成员值查找关联的项目.
Or, if the data in the arrays is not in any particular order, you can look up the associated item by the member value.
var merge = _.map(arr1, function(item) {
return _.merge(item, _.find(arr2, { 'member' : item.member }));
});
您可以轻松地将其转换为mixin.请参见下面的示例:
You can easily convert this to a mixin. See the example below:
_.mixin({
'mergeByKey' : function(arr1, arr2, key) {
var criteria = {};
criteria[key] = null;
return _.map(arr1, function(item) {
criteria[key] = item[key];
return _.merge(item, _.find(arr2, criteria));
});
}
});
var arr1 = [{
"member": 'ObjectId("57989cbe54cf5d2ce83ff9d6")',
"bank": 'ObjectId("575b052ca6f66a5732749ecc")',
"country": 'ObjectId("575b0523a6f66a5732749ecb")'
}, {
"member": 'ObjectId("57989cbe54cf5d2ce83ff9d8")',
"bank": 'ObjectId("575b052ca6f66a5732749ecc")',
"country": 'ObjectId("575b0523a6f66a5732749ecb")'
}];
var arr2 = [{
"member": 'ObjectId("57989cbe54cf5d2ce83ff9d8")',
"name": 'yyyyyyyyyy',
"age": 26
}, {
"member": 'ObjectId("57989cbe54cf5d2ce83ff9d6")',
"name": 'xxxxxx',
"age": 25
}];
var arr3 = _.mergeByKey(arr1, arr2, 'member');
document.body.innerHTML = JSON.stringify(arr3, null, 4);
body { font-family: monospace; white-space: pre; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.14.0/lodash.min.js"></script>
这篇关于如何使用lodash通过ID合并两个对象数组?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!