[英]API in Postman works fine but getting 422 error in react native
[英]API works fine in postman but not in frontend part of react
我正在 MERN 堆棧中做一個項目(電子商務項目)以進行練習。 我對 Mern 堆棧相當陌生。 除了前端部分的“UpdateCategory”外,一切正常。 它在 POSTMAN 中完美運行。 在前端部分它給出了錯誤。
我附上了與 updateCategory 部分相關的整個代碼,包括后端部分和 adminapi 調用以供參考。
前端“updateCategory”代碼附加在下面的 adminapicall 下方,請查看該代碼並嘗試找出問題所在。
看看這個截圖,點擊更新按鈕后,只有錯誤 function 工作正常。
https://i.stack.imgur.com/ApgVu.png
----------------------------------------------adminapicall--- ------------------------------------------
import { API } from "../../backend";
//category calls
export const createCategory = (userId, token, category) => {
return fetch(`${API}/category/create/${userId}`, {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/json",
Authorization: `Bearer ${token}`
},
body: JSON.stringify(category)
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get a category
export const getCategory = categoryId => {
return fetch(`${API}/category/${categoryId}`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get all categories
export const getCategories = () => {
return fetch(`${API}/categories`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//delete a category
export const deleteCategory = (categoryId, userId, token) => {
return fetch(`${API}/category/${categoryId}/${userId}`, {
method: "DELETE",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
}
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//update a category
export const updateCategory = (categoryId, userId, token, category) => {
return fetch(`${API}/category/${categoryId}/${userId}`, {
method: "PUT",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
},
body: category
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//products calls
//create a product
export const createaProduct = (userId, token, product) => {
return fetch(`${API}/product/create/${userId}`, {
method: "POST",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
},
body: product
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get all products
export const getProducts = () => {
return fetch(`${API}/products`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//delete a product
export const deleteProduct = (productId, userId, token) => {
return fetch(`${API}/product/${productId}/${userId}`, {
method: "DELETE",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
}
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get a product
export const getProduct = productId => {
return fetch(`${API}/product/${productId}`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//update a product
export const updateProduct = (productId, userId, token, product) => {
return fetch(`${API}/product/${productId}/${userId}`, {
method: "PUT",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
},
body: product
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
--------------------------------------------UpdateCategory----- ------------------------------------------
import React, { useState,useEffect } from "react";
import Base from "../core/Base";
import { isAutheticated } from "../auth/helper";
import { Link } from "react-router-dom";
import { getCategory, updateCategory } from "./helper/adminapicall";
const UpdateCategory = ({match}) => {
const [name, setName] = useState("");
const [error, setError] = useState(false);
const [success, setSuccess] = useState(false);
const { user, token } = isAutheticated();
const preload = categoryId => {
getCategory(categoryId).then(data =>{
if(data.error) {
console.log(data.error);
}else{
setName(data.name)
}
});
};
useEffect(() => {
preload(match.params.categoryId);
}, []);
const goBack = () => (
<div className="mt-5">
<Link className="btn btn-sm btn-success mb-3" to="/admin/dashboard">
Admin Home
</Link>
</div>
);
const handleChange = event => {
setError("");
setName(event.target.value);
};
const onSubmit = event => {
event.preventDefault();
setError("");
setSuccess(false);
//backend request fired
updateCategory(match.params.categoryId, user._id, token, { name }).then(data => {
if (data.error) {
setError(true);
} else {
setError("");
setSuccess(true);
setName("");
}
});
};
const successMessage = () => {
if (success) {
return <h4 className="text-success">Category created successfully</h4>;
}
};
const warningMessage = () =>{
if(error){
return <h4 className="text-danger">Failed to update</h4>
}
};
const myCategoryForm = () =>(
<form>
<div className="form-group">
<p className="lead">Enter the category</p>
<input
type="text"
className="form-control my-3"
onChange={handleChange}
value={name}
autoFocus
required
placeholder="For Ex.Summer"
/>
<button onClick={onSubmit} className="btn btn-outline-info">
Update Category
</button>
</div>
</form>
);
return (
<Base
title="Update a category here!!"
description="Update Categories here"
className="container bg-info p-4">
<div className="row bg-white rounded">
<div className="col-md-8 offset-md-2">
{successMessage()}
{warningMessage()}
{myCategoryForm ()}
{goBack ()}
</div>
</div>
</Base>
);
};
export default UpdateCategory;
import { API } from "../../backend";
//category calls
export const createCategory = (userId, token, category) => {
return fetch(`${API}/category/create/${userId}`, {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/json",
Authorization: `Bearer ${token}`
},
body: JSON.stringify(category)
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get a category
export const getCategory = categoryId => {
return fetch(`${API}/category/${categoryId}`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get all categories
export const getCategories = () => {
return fetch(`${API}/categories`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//delete a category
export const deleteCategory = (categoryId, userId, token) => {
return fetch(`${API}/category/${categoryId}/${userId}`, {
method: "DELETE",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
}
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//update a category
export const updateCategory = (categoryId, userId, token, category) => {
return fetch(`${API}/category/${categoryId}/${userId}`, {
method: "PUT",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
},
body: category
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//products calls
//create a product
export const createaProduct = (userId, token, product) => {
return fetch(`${API}/product/create/${userId}`, {
method: "POST",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
},
body: product
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get all products
export const getProducts = () => {
return fetch(`${API}/products`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//delete a product
export const deleteProduct = (productId, userId, token) => {
return fetch(`${API}/product/${productId}/${userId}`, {
method: "DELETE",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
}
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//get a product
export const getProduct = productId => {
return fetch(`${API}/product/${productId}`, {
method: "GET"
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
//update a product
export const updateProduct = (productId, userId, token, product) => {
return fetch(`${API}/product/${productId}/${userId}`, {
method: "PUT",
headers: {
Accept: "application/json",
Authorization: `Bearer ${token}`
},
body: product
})
.then(response => {
return response.json();
})
.catch(err => console.log(err));
};
----------------------------------------------管理類別--- ------------------------------------------
import React , {useState,useEffect} from 'react'
import Base from '../core/Base'
import { Link } from 'react-router-dom';
import { isAutheticated } from '../auth/helper';
import { getCategories, deleteCategory} from './helper/adminapicall';
const ManageCategories= () => {
const [categories, setCategories] = useState([]);
const { user, token } = isAutheticated();
const preload = () => {
getCategories().then(data => {
if (data.error) {
console.log(data.error);
} else {
setCategories(data);
}
});
};
useEffect(() => {
preload();
}, []);
const deleteThisCategory = categoryId => {
deleteCategory(categoryId, user._id, token).then(data => {
if (data.error) {
console.log(data.error);
} else {
preload();
}
});
};
return (
<Base title="Welcome admin" description="Manage products here">
<h2 className="mb-4">All products:</h2>
<Link className="btn btn-info" to={`/admin/dashboard`}>
<span className="">Admin Home</span>
</Link>
<div className="row">
<div className="col-12">
<h2 className="text-center text-white my-3">Total 4 categories</h2>
{categories.map((category, index) => {
return (
<div key={index} className="row text-center mb-2 ">
<div className="col-4">
<h3 className="text-white text-left">{category.name}</h3>
</div>
<div className="col-4">
<Link
className="btn btn-success"
to={`/admin/category/update/${category._id}`}
>
<span className="">Update</span>
</Link>
</div>
<div className="col-4">
<button
onClick={() => {
deleteThisCategory(category._id);
}}
className="btn btn-danger"
>
Delete
</button>
</div>
</div>
);
})}
</div>
</div>
</Base>
);
};
export default ManageCategories;
-------------------------------------------------------更新類別------ ------------------------------------------
import React, { useState,useEffect } from "react";
import Base from "../core/Base";
import { isAutheticated } from "../auth/helper";
import { Link } from "react-router-dom";
import { getCategory, updateCategory } from "./helper/adminapicall";
const UpdateCategory = ({match}) => {
const [name, setName] = useState("");
const [error, setError] = useState(false);
const [success, setSuccess] = useState(false);
const { user, token } = isAutheticated();
const preload = categoryId => {
getCategory(categoryId).then(data =>{
if(data.error) {
console.log(data.error);
}else{
setName(data.name)
}
});
};
useEffect(() => {
preload(match.params.categoryId);
}, []);
const goBack = () => (
<div className="mt-5">
<Link className="btn btn-sm btn-success mb-3" to="/admin/dashboard">
Admin Home
</Link>
</div>
);
const handleChange = event => {
setError("");
setName(event.target.value);
};
const onSubmit = event => {
event.preventDefault();
setError("");
setSuccess(false);
//backend request fired
updateCategory(match.params.categoryId, user._id, token, { name }).then(data => {
if (data.error) {
setError(true);
} else {
setError("");
setSuccess(true);
setName("");
}
});
};
const successMessage = () => {
if (success) {
return <h4 className="text-success">Category created successfully</h4>;
}
};
const warningMessage = () =>{
if(error){
return <h4 className="text-danger">Failed to update</h4>
}
};
const myCategoryForm = () =>(
<form>
<div className="form-group">
<p className="lead">Enter the category</p>
<input
type="text"
className="form-control my-3"
onChange={handleChange}
value={name}
autoFocus
required
placeholder="For Ex.Summer"
/>
<button onClick={onSubmit} className="btn btn-outline-info">
Update Category
</button>
</div>
</form>
);
return (
<Base
title="Update a category here!!"
description="Update Categories here"
className="container bg-info p-4">
<div className="row bg-white rounded">
<div className="col-md-8 offset-md-2">
{successMessage()}
{warningMessage()}
{myCategoryForm ()}
{goBack ()}
</div>
</div>
</Base>
);
};
export default UpdateCategory;
---------------------------------------------類別(控制器)- --------------------------------------
const Category = require("../models/category");
exports.getCategoryById = (req, res, next, id) => {
Category.findById(id).exec((err, cate) => {
if (err) {
return res.status(400).json({
error: "Category not found in DB"
});
}
req.category = cate;
next();
});
};
exports.createCategory = (req, res) => {
const category = new Category(req.body);
category.save((err, category) => {
if (err) {
return res.status(400).json({
error: "NOT able to save category in DB"
});
}
res.json({ category });
});
};
exports.getCategory = (req, res) => {
return res.json(req.category);
};
exports.getAllCategory = (req, res) => {
Category.find().exec((err, categories) => {
if (err) {
return res.status(400).json({
error: "NO categories found"
});
}
res.json(categories);
});
};
exports.updateCategory = (req, res) => {
const category = req.category;
category.name = req.body.name;
category.save((err, updatedCategory) => {
if (err) {
return res.status(400).json({
error: "Failed to update category"
});
}
res.json(updatedCategory);
});
};
exports.removeCategory = (req, res) => {
const category = req.category;
category.remove((err, category) => {
if (err) {
return res.status(400).json({
error: "Failed to delete this category"
});
}
res.json({
message: "Successfull deleted"
});
});
};
嘗試這個
....
....
const onSubmit = (event, val) => {
event.preventDefault();
setError("");
setSuccess(false);
//backend request fired
updateCategory(match.params.categoryId, user._id, token, { name:val }).then(
(data) => {
if (data.error) {
setError(true);
} else {
setError("");
setSuccess(true);
setName("");
}
}
);
};
....
....
<button onClick={(e)=> onSubmit(e, name)} className="btn btn-outline-info">
Update Category
</button>
....
....
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