如何更新猫鼬默认字符串架构属性修剪? [英] How to update mongoose default string schema property trim?

问题描述

我希望每个字符串属性的修剪默认设置为true. 有办法吗?

I would like to have every string property have trim set to true by default. Is there a way?

?? mongoose.Schema.String -> default { trim: true }

var schema = new Schema({
  p1: { type: String },
  p2: { type: String, trim: true }
  p3: { type: String, trim: true }
  p4: { type: String }
});

推荐答案

为架构路径重用通用配置的一种好方法是使用变量进行设置.

A good way to re-use common configurations for schema paths is to set them using a variable.

喜欢这个:

var trimmedString = { type: String, trim: true };

var schema = new Schema({
  p1: trimmedString,
  p2: trimmedString,
  p3: trimmedString,
  p4: trimmedString
});

您还可以从为您设置默认值的函数中返回定义，但是允许您进行两项覆盖(或添加其他设置，例如索引或默认值).

You could also return the definition from a function that sets defaults for you, but allows you two override things (or add other settings, like an index or default).

喜欢这个:

(使用下划线库的默认方法)

var _ = require('underscore');

var stringType = function(ops) {
  return _.defaults(ops || {}, {
    type: String,
    trim: true
  });
}

var schema = new Schema({
  p1: stringType(),
  p2: stringType({ index: true }),
  p3: stringType({ default: "something" }),
  p4: stringType({ trim: false })
});

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