Express / Mongoose项目中的HTTP Get和Post请求中缺less内容

我有以下文件。 我有一个recipe.js文件，概述了食谱的Mongoose Schema和食谱的注释。 代码如下：

const express = require('express'); const mongoose = require('mongoose'); const User = require('../models/user'); let Schema = mongoose.Schema; let commentSchema = Schema({ rating: { type: Number, // required: true, min: 1, max: 5, }, recipeItem: { type: mongoose.Schema.Types.ObjectId, ref: 'Recipe' }, comment: { type: String, // required: true }, postedBy: { type: mongoose.Schema.Types.ObjectId, ref: 'User' }, likedBy: { type: mongoose.Schema.Types.ObjectId, ref: 'User' }, favouredBy: { type: mongoose.Schema.Types.ObjectId } }); let Comment = mongoose.model('Comment', commentSchema); let recipeSchema = Schema({ name: { type: String, required: true }, description: { type: String, }, steps: { type: String, required: true, }, ingredients: { type: Array, required: true }, comments: [commentSchema], category: { type: String, required: true, }, postedBy: { type: mongoose.Schema.Types.ObjectId, ref: 'User' } }); /// So I learnt that by defining the string as "Recipe" in the model function, I will have to lower case it /// and pluralize it when I use it with res.json and other such things (ie "Recipe" => recipes). let Recipe = mongoose.model('Recipe', recipeSchema); module.exports = Recipe; module.exports = Comment; /// refactor this so that these are in the router, not in the models file /* module.exports.getRecipeByName = (name, callback) => { let nameQuery = {name: name}; Recipe.findOne(nameQuery, callback); }; module.exports.getRecipesByCategory = (category, callback) => { Recipe.find({'category': category}); }; */ 

我也有一个user.js文件，其中概述了一个用户模型以及它与其他模型/模式的关系。 该文件中的代码如下所示：

 const express = require('express'); const mongoose = require('mongoose'); const bcrypt = require('bcrypt'); const passportLocalMongoose = require('passport-local-mongoose'); const passport = require('passport'); let Schema = mongoose.Schema; let User = Schema({ name: { type: String }, // The passport plugin already inputs username and password into our Schema username: { type: String, unique: true, required: true }, password: { type: String, required: true, }, profilePic: { type: String }, email: { type: String, unique: true, required: true }, admin: { type: Boolean, defualt: false }, usersRecipes: [{type: Schema.Types.ObjectId, ref:'Recipe'}], userComments: [{type: Schema.Types.ObjectId, ref: 'Comment'}], usersFavouriteRecipes: [{type: Schema.Types.ObjectId, ref: 'Recipe'}], usersLikedRecipes: [{type: Schema.Types.ObjectId, ref: 'Recipe'}] }); let options = ({missingPasswordError: "Incorrect password, try again"}); User.plugin(passportLocalMongoose, options); module.exports = mongoose.model('User', User); 

这里是recipeRouter.js，我定义了所有HTTP请求和路由的文件：

 const express = require('express'); const passport = require('passport'); const Recipe = require('../models/recipe'); const jwt = require('jsonwebtoken'); const bodyParser = require('body-parser'); const mongoose = require('mongoose'); const verification = require('../verification'); const Comment = require('../models/recipe'); // I temporarily removed verification.checkIfUserExists to see if all this database stuff works router = express.Router(); router.use(bodyParser.json()); router.get('/', (req, res) => { res.json('Here are the recipes!') }); router.get('/showrecipes', (req, res) => { Recipe.find({}).populate('Comment').exec((err, recipes) => { if (err) throw err; res.json(recipes); }) }); router.get("/showrecipes/:recipeId", (req, res) => { let nameQuery = {_id: req.params.recipeId}; Recipe.findOne(nameQuery, (err, recipes) => { if (err) throw err; res.json(recipes); }) //// Don't know if this is correct .populate('comment.recipeItem'); }); router.get('/showrecipes/category/:categoryname', (req, res) => { let nameQuery = {category: req.params.categoryname}; Recipe.find(nameQuery, (err, recipes) => { if (err) throw err; res.json(recipes); }); }); router.post('/addrecipe', (req, res, next) => { Recipe.create({ name: req.body.name, description: req.body.description, steps: req.body.steps, ingredients: req.body.ingredients, category: req.body.category }, (err, recipes) => { if (err) throw err; res.json(recipes); }); }); // See if this works router.put("/showrecipes/:recipeId", (req, res) => { let query = {_id: req.params.recipeId}; Recipe.findByIdAndUpdate(query, { $set: req.body }, { new: true }, (err, recipe) => { if (err) throw err; res.json(recipe) }) }); router.delete("/showrecipes/:recipeId", (req, res) => { let query = {_id: req.params.recipeId}; Recipe.findByIdAndRemove(query, (err, recipe) => { if (err) throw err; res.send('Recipe was succesfully deleted'); }) }); router.get("/showrecipes/:recipeId", (req, res) => { let nameQuery = {_id: req.params.recipeId}; Recipe.findOne(nameQuery, (err, recipes) => { if (err) throw err; res.json(recipes); }) .populate('comments') .exec((err) => { if (err) throw err; }) }); router.post("/showrecipes:/:recipeId/addcomment", (req, res, next) => { Comment.create({ rating: req.body.rating, comment: req.body.comment, postedBy: postedBy, date: Date.now(), recipeItem: recipeId }) }); router.get('/showrecipes/byuser/:username', (req, res) => { let query = {postedBy: req.params.username}; Recipe.find(query, (err, recipes) => { if (err) throw err; res.json(recipes) }) }); module.exports = router; 

现在，在某个时候，我可以创build食谱并将它们存储在我的数据库中，没有任何问题。 但现在这个奇怪的事情发生。

在这里，我提出了我的发布请求，你可以在下面的截图中看到：

但是由于一些奇怪的原因，每次我发出get请求，我的json正文请求中指定的键/值对都没有。 每个配方对象现在只能作为其中的_id。

谁能帮我？ 这似乎很奇怪。

Answer 1

看起来你只是缺lessapplication/json Content-Type头。

在Postman中，只需设置标题，如图所示。