[英]meteor collection hooks updating element on a position in array
i have this object: 我有这个对象:
card: { customFields [ { id, value }, {id , value } ... ] }
A customFields array is inside cards, which contans elements consisting of an id and a value. customFields数组位于卡内,包含由id和value组成的元素。
Now i want to update a certain element inside of the array, which can be done by doing something like this: 现在,我想更新数组中的某个元素,可以通过执行以下操作来完成:
modifier.$set.customFields.0.value = x
but i have the number of the index only in a variable, so i tried: 但是我只在一个变量中有索引号,所以我尝试了:
const index = getTargetIndex();
modifier.$set.customFields[index].value = x
but it didn't work... 但这没用...
What do i have to add to the modifier.$set to update an element in this array? 我必须添加到Modifyer。$ set中以更新此数组中的元素的内容是什么?
Alternate Solution: i have the id of the element in the array if the update can be done on value by using the id. 替代解决方案:如果可以通过使用ID对值进行更新,则我具有数组中元素的ID。
找到一个解决方案:
modifier.$set[`customFields.${ index }.value`]
It looks like you'll need to do it using a second update: 看来您需要使用第二次更新:
update(selector, modifier, options, callback) {
let i = 1;
let val = 20;
// The field in the array you want to modify
let _modifier = {$set: {"customFields.$.value": val}};
// The selector for main element and the array element
let _selector = Object.assign(selector, {"customFields.id": i});
// Update the array
super.update(_selector, _modifier);
// Continue with the actual update
return super.update(selector, modifier, options, callback);
}
I'm assuming it's safe to call super.update()
twice in the same hook. 我假设在同一钩子中两次调用
super.update()
是安全的。
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