未捕获的类型错误:state.productDetails不是函数

Question

import React, { useEffect } from "react";
import Loader from "../layout/Loader";
import { useAlert } from "react-alert";
import { useDispatch, useSelector } from "react-redux";
import { getProductDetails, clearErrors } from "../../actions/productActions";

const ProductDetails = ({ match }) => {
const dispatch = useDispatch();
const alert = useAlert();
const { loading, error, product } = useSelector((state) =>
state.productDetails()
);
useEffect(() => {
dispatch(getProductDetails());
if (error) {
alert.error(error);
dispatch(clearErrors());
}
}, [dispatch, alert, error]);
return (
<>
{!loading ? (
<Loader />
) : (
<>
<div className='row f-flex justify-content-around'>
<div className='col-12 col-lg-5 img-fluid' id='product_image'>
<img
src='https://i5.walmartimages.com/asr/1223a935-2a61-480a-95a1-21904ff8986c_1.17fa3d7870e3d9b1248da7b1144787f5.jpeg?odnWidth=undefined&odnHeight=undefined&odnBg=ffffff'
alt='sdf'
height='500'
width='500'/>
</div>
<div className='col-12 col-lg-5 mt-5'>
<h3>{product.name}</h3>
<p id='product_id'>Product # sklfjdk35fsdf5090</p>
<hr />
<div className='rating-outer'>
<div className='rating-inner'></div>
</div>
<span id='no_of_reviews'>(5 Reviews)</span>
<hr />
<p id='product_price'>$108.00</p>
<div className='stockCounter d-inline'>
<span className='btn btn-danger minus'>-</span>
<input
type='number'
className='form-control count d-inline'
value='1'
readOnly
/>
<span className='btn btn-primary plus'>+</span>
</div>
<button
type='button'
id='cart_btn'
className='btn btn-primary d-inline ml-4'
>
Add to Cart
</button>
<hr />
<p>
Status: <span id='stock_status'>In Stock</span>
</p>
<hr />
<h4 className='mt-2'>Description:</h4>
<p>
Binge on movies and TV episodes, news, sports, music and more!
We insisted on 720p High Definition for this 32" LED TV,
bringing out more lifelike color, texture and detail. We also
partnered with Roku to bring you the best possible content with
thousands of channels to choose from, conveniently presented
through your own custom home screen.
</p>
<hr />
<p id='product_seller mb-3'>
Sold by: <strong>Amazon</strong>
</p>
<button
id='review_btn'
type='button'
className='btn btn-primary mt-4'
data-toggle='modal'
data-target='#ratingModal'
>
Submit Your Review
</button>
<div className='row mt-2 mb-5'>
<div className='rating w-50'>
<div
className='modal fade'
id='ratingModal'
tabIndex='-1'
role='dialog'
aria-labelledby='ratingModalLabel'
aria-hidden='true'
>
<div className='modal-dialog' role='document'>
<div className='modal-content'>
<div className='modal-header'>
<h5 className='modal-title' id='ratingModalLabel'>
Submit Review
</h5>
<button
type='button'
className='close'
data-dismiss='modal'
aria-label='Close'
>
<span aria-hidden='true'>&times;</span>
</button>
</div>
<div className='modal-body'>
<ul className='stars'>
<li className='star'>
<i className='fa fa-star'></i>
</li>
<li className='star'>
<i className='fa fa-star'></i>
</li>
<li className='star'>
<i className='fa fa-star'></i>
</li>
<li className='star'>
<i className='fa fa-star'></i>
</li>
<li className='star'>
<i className='fa fa-star'></i>
</li>
</ul>
<textarea
name='review'
id='review'
className='form-control mt-3'
></textarea>
<button
className='btn my-3 float-right review-btn px-4 text-white'
data-dismiss='modal'
aria-label='Close'
>
Submit
</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</>
)}
</>
);
};
export default ProductDetails;

Answer 1

如错误所示

state.productDetails不是函数

这是因为productDetails是一个reducer对象，而不是redux创建的函数。因此，您的代码应该是

const { loading, error, product } = useSelector((state) =>state.productDetails); //Note: productDetails without '()'

希望能有所帮助。

旁注：在发布任何问题或答案时，请下次正确格式化代码，使其可读。：(