我想省略req.body的数据,收集在更新资源时,只有那些字段null或''集合中的现有资源。
但这也可能是通用的,这就是标题更通用的原因。
无论如何,请想象以下情况:
我们的数据库中有一个用户具有以下数据:
{
"firstName": "John",
"lastName": "Doe",
"address": {
"Address1": "Random street 1",
"City": "",
"Country": null
},
"email": ""
}
用户正在尝试使用以下数据更新现有资源:
{
"firstName": "Mark",
"address": {
"Address1": "Random street 2",
"City": "NY",
"Country": "USA"
},
"email": "john.doe@mail.com"
}
更新后的对象应该是这样的:
{
"firstName": "John", // Unchanged because propety value already exists
"lastName": "Doe",
"address": {
"Address1": "Random street 1", // Unchanged because propety value already exists
"City": "NY", // Updated because existing value is empty ("")
"Country": "USA" // Updated because existing value is null
},
"email": "john.doe@mail.com" // Updated because existing value is empty ("")
}
我正在使用猫鼬,但我宁愿在基本的 javascript 对象级别上实现它
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