如何在保存单击时更新KeystoneJS中的文档? [英] How do you update a document in KeystoneJS on save click?

问题描述

我想在更改另一个字段后更新文档中的特定字段. 我有一个产品代码，还有一些价格和标题等字段，这些字段是从外部api获取的.

I want to update specific fields in a document after changing another field. I've got a product code and a few fields like price and title which I get from an external api.

每当有人在后端更改产品代码时，我都希望更新文档中的价格和标题. 首先，我尝试在模式上使用猫鼬发布保存钩子.这导致无休止的循环，因为在保存文档后，它不断更新并因此保存了文档. 然后，我实现了一个布尔值，以确保后保存挂钩仅被调用一次，如下所示:

I want to update the price and title in the document whenever someone changes the product code in the backend. First I tried using a mongoose post save hook on the schema. This resulted in an endless loop, since it kept updating and thus saving the document, after saving the document. Then I implemented a boolean to make sure the post save hook is called only once, which looks something like this:

let postSaveTriggered = false;

//update our product!
Product.schema.post('save', function(doc, next) {
    if (!postSaveTriggered) {
        postSaveTriggered = true;
        api.product.updateInfo(doc, function() { //this updates the document
            next();
        });
    } else {
        postSaveTriggered = false;
        next();
    }
});

但是我只希望此功能在用户实际更改产品代码时触发，而不是在一般情况下更新产品时触发.我也在执行一项计划任务，以更新产品的价格，显然，我不希望在这种情况下触发后保存挂钩. 有什么方法可以使用KeystoneJS后端实现我想要的功能?

But I only want this function to trigger when a user actually changes the product code, not when the product is updated in general. I'm also running a cron job to update the prices of the products and I obviously don't want the post save hook to trigger at all in this scenario. Is there any way to achieve what I want using the KeystoneJS backend?

推荐答案

找到了方法！

首先使用 pre 保存钩来监视产品代码中的更改:

First use a pre save hook to watch for changes in the product code:

let updateProduct = false;

Product.schema.pre('save', function(next) {
    updateProduct = this.isModified('code');
    next();
});

然后仅当updateProduct为true时，才在发布保存钩子中进行更新:

Then simply only update in the post save hook when updateProduct is true:

Product.schema.post('save', function(doc, next) {
    if (updateProduct) {
        updateProduct = false;
        api.product.updateInfo(doc, function() {
            next();
        });
    } else {
        next();
    }
});

为我工作，尽管看起来仍然不必要复杂.

Works for me, still seems unnecessary complicated though.

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