Node.js MongooseJs：如何为必需的、唯一的索引和枚举失败设置自定义错误消息

我想用一些更用户友好的东西来定制它，但我不知道如何为必需的、唯一的索引和枚举失败设置自定义错误消息。我该怎么办？

我认为您不能用所需的选项覆盖错误消息。如果您需要在模式中自定义消息，而不是在保存时，我认为您最好编写一个自定义验证器，如下所示：

var userSchema = Schema({
  email: {
    type: String,
    unique: true,
    match: /^[a-z0-9._-]+@[a-z0-9.-]+\.[a-z]{2,4}$/,
    lowercase: true,
    trim: true
  },
  nickname: {
    type: String,
    trim: true,
    required: true
  },
  password: { type: String, required: true },
  url: { type: String, trim: true, default: '' },
  role: {
    type: String,
    enum: [ 'admin', 'reader' ],
    default: 'reader'
  },
  about: { type: String, trim: true },
  created: { type: Date, default: Date.now, required: true }
});

function createdValidator(created) {
  return (created !== undefined && created !== null);
}

....

new Schema({created: { type: Date, default: Date.now, validate: [createdValidator, "custom error message"] } });

更新：

根据文档，您可以执行以下多种验证：

var userSchema = Schema({
  email: {
    type: String,
    unique: true,
    match: /^[a-z0-9._-]+@[a-z0-9.-]+\.[a-z]{2,4}$/,
    lowercase: true,
    trim: true
  },
  nickname: {
    type: String,
    trim: true,
    required: true
  },
  password: { type: String, required: true },
  url: { type: String, trim: true, default: '' },
  role: {
    type: String,
    enum: [ 'admin', 'reader' ],
    default: 'reader'
  },
  about: { type: String, trim: true },
  created: { type: Date, default: Date.now, required: true }
});

function createdValidator(created) {
  return (created !== undefined && created !== null);
}

....

new Schema({created: { type: Date, default: Date.now, validate: [createdValidator, "custom error message"] } });

---

多个验证如何？是的，有一些关于进行多个验证的文档，我会更新我的答案以便格式化。