如何在 AdonisJs 中使用 HasMany 关系

Question

I am trying to do hasMany relationship in my adonisjs project on Post and User model

I have a column of user_id in my database column and i have tried the below code

posts () {
    return this.hasMany('App/Models/Post')
  }

in my User model but anytime i make a post i get this ER_NO_DEFAULT_FOR_FIELD: Field 'user_id' doesn't have a default value

Answer 1

The user_id field in the post model cannot be null.

You can set a default value in the post migration

// every post has a default owner
table.integer('user_id').defaultTo(1)

or allow the relationship to be null

table.integer('user_id').nullable()