错误1075：表定义不正确； 只能有一个自动列，它必须被定义为一个键（使用 gorm 和 mysql）

Question

when I add gorm model to my struct i got this error

im using gorm model in my other 3 struct but only when i add this to my journal struct i got error Error 1075: Incorrect table definition; there can be only one auto column and it must be defined as a key here are my structs

package migrations

import "gorm.io/gorm"

type Category struct {
   gorm.Model
   Title string `gorm:"type:varchar(255)"`
   Sort  int    `gorm:"sort"`
}

package migrations

import "gorm.io/gorm"

type Contents struct { gorm.Model CategoryId uint CategoryModel Category gorm:"foreignKey:category_id" Title string gorm:"type:varchar(255)" Content string gorm:"content" Status bool gorm:"default:true" Sort int gorm:"sort" Images []Image gorm:"foreignKey:content_id" }

package migrations

import "gorm.io/gorm"

type Image struct {
   gorm.Model
   ContentId    uint
   ContentModel Contents `gorm:"foreignKey:content_id"`
   Title        string   `gorm:"type:varchar(255)"`
   File         string
   Sort         int `gorm:"sort"`
}

//`gorm:"type:varchar(255)"`

package migrations

import "gorm.io/gorm"

type Journal struct {
   gorm.Model
   ModelName string `gorm:"ModelName"`
   UpdatedBy string `gorm:"UpdatedBy"`
   Row       uint   `gorm:"foreignKey:category_id"`
   NewValue  string `gorm:"newValue"`
   OldValue  string `gorm:"oldValue"`
   Column    string `gorm:"Column"`
}

Answer 1

When gorm do migration it usually migrates what is added to table. But if you remove any thing from struct that thing is not removed from table while migration. Suppose there was a Key column of auto type. If you remove it from struct it will not be auto removed from table after migration rather you need to manually remove it from table. I think this type of scenario happened with you.