向MongoDB保存帖子时遭遇Unexpected end of input错误求助

Hey there, let's break down what's going wrong here. That Unexpected end of input error almost always means you've got unclosed curly braces {} somewhere in your code, and that's exactly what's happening here. Let's walk through the fixes step by step:

1. Fix Unclosed Braces & Extra Brackets in cleanUp() #

Looking at your cleanUp method, you've got extra opening braces that don't have matches, and you never closed the function itself. That's the main cause of the syntax error. Here's the corrected version of this method:

Post.prototype.cleanUp = function() {
  // Validate title is a string
  if (typeof(this.data.title) !== "string") {
    this.data.title = ""
  }
  // Validate body is a string (you had an extra opening brace here before)
  if (typeof(this.data.body) !== "string") {
    this.data.body = ""
  }
  // Clean up and restructure the data object
  this.data = {
    title: this.data.title.trim(), // Fixed key name and property reference
    body: this.data.body.trim(),   // Fixed incorrect property path
    createdDate: new Date()
  }
} // <-- You were missing this closing brace for the cleanUp function!

2. Fix Critical Data Property Typos #

In your original cleanUp method, you had two typos that would have broken your data even if the syntax error was fixed:

• You used data: this.data.title.trim() instead of title: this.data.title.trim() — the key name should match the property you intend to store
• You wrote body: this.body.title.trim() which is completely wrong — it should be this.data.body.trim() (you need to access the body property from the instance's data object)

3. Full Corrected Code #

Here's the complete, working version of your postController.js with all fixes applied, plus a minor best practice update (using strict equality checks):

const postsCollection = require('../db').db().collection("posts")

let Post = function(data) {
  this.data = data
  this.errors = []
}

Post.prototype.cleanUp = function() {
  if (typeof(this.data.title) !== "string") {
    this.data.title = ""
  }
  if (typeof(this.data.body) !== "string") {
    this.data.body = ""
  }
  // Restructure cleaned data with correct properties
  this.data = {
    title: this.data.title.trim(),
    body: this.data.body.trim(),
    createdDate: new Date()
  }
}

Post.prototype.validate = function() {
  if (this.data.title === "") {
    this.errors.push("Please provide a title.")
  }
  if (this.data.body === "") {
    this.errors.push("Please provide post input.")
  }
}

Post.prototype.create = function() {
  return new Promise((resolve, reject) => {
    this.cleanUp()
    this.validate()
    if (!this.errors.length) {
      postsCollection.insertOne(this.data)
        .then(() => resolve())
        .catch(() => {
          this.errors.push("Please try again later.")
          reject(this.errors)
        })
    } else {
      reject(this.errors)
    }
  })
}

module.exports = Post

Quick Pro Tip #

Consistent indentation (I used 2 spaces here) makes it way easier to spot unclosed braces and typos in the future. It's a small habit that saves a ton of debugging time!

内容的提问来源于stack exchange，提问作者Bit