无法将具有复合键的对象添加到 IndexedDB objectStore。密钥已存在于对象存储中。当只有一个条目相同时

Question

我有一个带有以下键的 objectStore：

当我添加具有相同productId但不同shopName的对象时，事务报告错误：ConstraintError: Key already exists in the object store.。这就是我创建 objectStore:

的方式

openRequest.onupgradeneeded = e => {
    // @ts-ignore
    db = e.target.result;
    const objectStore = db.createObjectStore('cart', {keyPath: ['productId', 'shopName']})
    console.log('Db set up')
}

这就是我添加对象的方式：

    function addProduct(product: CartProduct) {
        const pk = {productId: product.productId, shopName: product.shopName}

        const {transaction, objectStore, cursorRequest} = getIndexedDbTriplet();

        cursorRequest.onsuccess = e => {
            // @ts-ignore
            const cursor = e.target.result
            if (cursor) {
                if (cursor.primaryKey[0] === pk.productId && cursor.primaryKey[1] === pk.shopName) {
                    cursor.value.count++
                    cursor.update(cursor.value)
                    // @ts-ignore
                    console.log(`Found ${JSON.stringify(pk)} in db and updated`)
                    return
                }
                cursor.continue()
            }
            objectStore.add(product)
            transaction.oncomplete = () => console.log(`Added ${JSON.stringify(pk)} to db`)
        }

        // @ts-ignore
        transaction.onerror = e => console.log(`Transaction to add product failed: ${JSON.stringify(pk)} ${e.target.error}`)
    }

export class CartProduct {
    readonly productId: number
    readonly name: string
    readonly price: number
    readonly shopName: string
    readonly imageUri: string
    readonly weight: number
    readonly count = 1

    constructor(productId: number, name: string, price: number, shopName: string, imageUri: string, weight: number) {
        this.productId = productId
        this.name = name
        this.price = price
        this.shopName = shopName
        this.imageUri = imageUri
        this.weight = weight
    }
}

export function getIndexedDbTriplet() {
    const transaction = db.transaction('cart', 'readwrite')
    const objectStore = transaction.objectStore('cart')
    const cursorRequest = objectStore.openCursor()
    return {transaction, objectStore, cursorRequest};
}

所有代码都在同一个文件中。

Answer 1

用 put 函数调用替换 add 解决了问题。

无法将具有复合键的对象添加到 IndexedDB objectStore。密钥已存在于对象存储中。当只有一个条目相同时

Cannot add object with composite key to IndexedDB objectStore. Key already exists in the object store. When only one entry is the same

typescript

indexeddb