MongoDB add, delete, modify, query operation mongoose verification + set association

mongoose verification

When creating a collection rule, you can set the validation rules for the current field. If validation fails, insert failure will be entered

Commonly used validation rules provided within mongoose:

required: true required field or [ true , ‘ Please enter ×× ‘ ]

minlength: Minimum length of string maxlength Maximum length of string (error message can also be customized)

trim: remove spaces on both sides of the string

min: 2 The minimum value is 2

max: 100 The maximum value is 100

default: default value

enum: enumerates the values ​​that the current field can have

Custom validator:

validate: custom validator

set association

Usually there is a relationship between data in different collections. For example, article information and user information are stored in different collections, but the article is published by a user. To query all the information of the article including the publishing user, just Need to use collection association

• Associate collections using ids
• Use the populate method to query related collections

Collection association implementation

Case: Add, delete, modify and check user information