如何正确使用数据加载器加载功能？

发布于 2025-02-11 02:12:00 字数 1490 浏览 1 评论 0原文

我正在尝试使用dataloader's loadMany函数。但是我遇到了错误。我已经在许多地方搜索了许多解决方案。请帮我。

这是我的try-

loader.js（在这里我编写加载程序函数） -

//Models
const {Subcategory} = require("../Models/categoryModel");

module.exports.batchSubCategory = async (categoryIds) => {
    const subcategory = await Subcategory.find({_id: {$in: categoryIds}});
    return categoryIds.map(categoryId => subcategory.find(category => category.id === categoryId));
}

然后在阿波罗上下文中 -

const apolloServer = new ApolloServer({
    typeDefs,
    resolvers,
    context: async ({ req }) => {
        return {
            loaders: {
                subCategory: new Dataloader(keys => loaders.subCategoryLoaders.batchSubCategory(keys)),
            }
        }
    }
});

我调用此子类别loader-

subCategory: async (parent, _, { loaders }) => {
    const subcategory = await loaders.subCategory.loadMany(parent.subCategory.toString())
    return subcategory;
}

请注意：我使用loadMany，因为这里的子类别是[ ID]。这是image-

并且当我运行应用程序时 - 我将获得此类型的错误

- loader.loadmany（）函数必须使用数组＆lt; key＆gt;但GoT：62BAB157E769A7DDA09EC63F，62BAB15CE769A7DDA09EC64A，62BAB164E769A7DDA09EC657。

现在我无法理解如何解决此错误。请帮我。请给您一些宝贵的时间来解决我的问题。

原文

I am trying to use dataloader's loadMany function. But I am getting error. I already search many where but not getting any solutions. Please help me.

Here is my try-

loader.js (Here I write Loader function)-

//Models
const {Subcategory} = require("../Models/categoryModel");

module.exports.batchSubCategory = async (categoryIds) => {
    const subcategory = await Subcategory.find({_id: {$in: categoryIds}});
    return categoryIds.map(categoryId => subcategory.find(category => category.id === categoryId));
}

And then in Apollo Context-

const apolloServer = new ApolloServer({
    typeDefs,
    resolvers,
    context: async ({ req }) => {
        return {
            loaders: {
                subCategory: new Dataloader(keys => loaders.subCategoryLoaders.batchSubCategory(keys)),
            }
        }
    }
});

The I call this Subcategory loader-

subCategory: async (parent, _, { loaders }) => {
    const subcategory = await loaders.subCategory.loadMany(parent.subCategory.toString())
    return subcategory;
}

Notice: Here I use loadMany because Here subCategory is a Array of [ids]. Here is image-