Example of definition of golang Gorm model structure

type User struct {
    
    Birthday     
    Age          int
    Name         string  `gorm:"size:255"`       // The default length of string is 255, use this tag to reset.    Num          int     `gorm:"AUTO_INCREMENT"` // Self-increase    CreditCard        CreditCard      // One-To-One (has a UserID of the CreditCard table as a foreign key)    Emails            []Email         // One-To-Many (Have multiple - UserID of the Email table as a foreign key    BillingAddress    Address         // One-To-One (belongs to - the BillingAddressID of this table as a foreign key)    BillingAddressID  sql.NullInt64
    ShippingAddress   Address         // One-To-One (belongs to - ShippingAddressID of this table as a foreign key)    ShippingAddressID int
    IgnoreMe          int `gorm:"-"`   // Ignore this field    Languages         []Language `gorm:"many2many:user_languages;"` // Many-To-Many, 'user_languages' is the connection table}
type Email struct {
    ID      int
    UserID  int     `gorm:"index"` // Foreign key (belongs to), tag `index` is to create an index for this column    Email   string  `gorm:"type:varchar(100);unique_index"` // `type` sets the sql type, `unique_index` sets a unique index for this column    Subscribed bool
}
type Address struct {
    ID       int
    Address1 string         `gorm:"not null;unique"` // Set the field to non-empty and unique    Address2 string         `gorm:"type:varchar(100);unique"`
    Post      `gorm:"not null"`
}
type Language struct {
    ID   int
    Name string `gorm:"index:idx_name_code"` // Create an index and name it. If you find another index with the same name, create a composite index    Code string `gorm:"index:idx_name_code"` // `unique_index` also works
}
type CreditCard struct {
    
    UserID  uint
    Number  string
}

// Definition of basic modeltype Model struct {
  ID        uint `gorm:"primary_key"`
  CreatedAt 
  UpdatedAt 
  DeletedAt *
}
// Add fields `ID`, `CreatedAt`, `UpdatedAt`, `DeletedAt`type User struct {
  
  Name string
}
// Only fields `ID`, `CreatedAt` are requiredtype User struct {
  ID        uint
  CreatedAt 
  Name      string
}

type User struct {} // The default table name is `users`// Set the User's table name to `profiles`func (User) TableName() string {
  return "profiles"
}
func (u User) TableName() string {
    if  == "admin" {
        return "admin_users"
    } else {
        return "users"
    }
}
// Globally disable table name plural(true) // If set to true, the default table name of `User` is `user`, the table name set using `TableName` will not be affected

 = func (db *, defaultTableName string) string  {
    return "prefix_" + defaultTableName;
}

type User struct {
  ID uint             // Column name is `id`  Name string         // Column name `name`  Birthday   // The column is named `birthday`  CreatedAt  // The column name is `created_at`}
// Reset the column nametype Animal struct {
    AnimalId    int64     `gorm:"column:beast_id"`         // Set the column name to `beast_id`    Birthday     `gorm:"column:day_of_the_beast"` // Set the column name to `day_of_the_beast`    Age         int64     `gorm:"column:age_of_the_beast"` // Set the column name to `age_of_the_beast`}

type User struct {
  ID   uint  // Field `ID` is the default primary key  Name string
}
// Use tag `primary_key` to set the primary keytype Animal struct {
  AnimalId int64 `gorm:"primary_key"` // Set AnimalId as the primary key  Name     string
  Age      int64
}

(&user) // `CreatedAt` will be set to the current time// To change its value, you need to use `Update`(&user).Update("CreatedAt", ())

(&user) // `UpdatedAt` will be set to the current time(&user).Update("name", "jinzhu") // `UpdatedAt` will be set to the current time