go-gorm，postgres:简单插入返回错误

Question

由于最近的炒作，我正在尝试做简单的插入，试图评估Postgres的有用性。我是mongoDB的一员。这就是我想要做的：

db, e := gorm.Open("postgres", fmt.Sprintf("host=%s user=%s dbname=%s password=%s sslmode=disable", pgHost, pgUser, pgDatabase, pgPass))
if e != nil {
    log.Fatal(e.Error())
}
defer db.Close()
db.AutoMigrate(&model.Customer{}, &model.Email{}, &model.Address{}, &model.Name{}, &model.Logindata{})

name := new(model.Name)
email := new(model.Email)
customer := &model.Customer{
    Name:         name,
    PrimaryEmail: email,
}
customer.Name.First = "Darko"
customer.Name.Last = "Luketic"
customer.Name.Middle = "" // also tried without this line
customer.PrimaryEmail.Address = "my@mail.come"
customer.PrimaryEmail.Verified = true
tx := db.Begin()

if e := tx.Create(name); e != nil {
    tx.Rollback()
    log.Fatal("create name", e.Error)
}

if e := tx.Create(email); e != nil {
    tx.Rollback()
    log.Fatal("create email", e.Error)
}

if e := tx.Create(customer); e != nil {
    tx.Rollback()
    log.Fatal("create customer", e.Error)
}

tx.Commit()

模型是

package model

import "github.com/jinzhu/gorm"

type Customer struct {
    gorm.Model
    Name            *Name
    BillingAddress  *Address
    ShippingAddress *Address
    PrimaryEmail    *Email
    AlternateEmails []*Email
    Logindata       *Logindata
}

type Name struct {
    gorm.Model
    First  string `json:"first"`
    Middle string `json:"middle"`
    Last   string `json:"last"`
}

type Logindata struct {
    gorm.Model
    Username string
    Password []byte
}

type Email struct {
    gorm.Model
    Address  string
    Verified bool
}

type Address struct {
    gorm.Model
    Address1 string
    Address2 string
    City     string
    Code     string
    Country  string
}

输出：

go run main.go migrate
migrate called
2017/08/01 17:10:26 create name<nil>
exit status 1

我做错了什么？为什么没有错误消息？我该如何修复它？

Answer 1

根据docs，Create返回一个*DB，而不是一个错误。所以你的代码应该更像这样

if tx = tx.Create(name); tx.Error != nil { /* ... */ }

Answer 2

另外，另外，

db, e := gorm.Open("postgres", fmt.Sprintf("host=%s user=%s dbname=%s password=%s sslmode=disable", pgHost, pgUser, pgDatabase, pgPass))
if e != nil {
    log.Fatal(e.Error())
}
defer db.Close()
db.AutoMigrate(&model.Customer{}, &model.Email{}, &model.Address{}, &model.Name{}, &model.Logindata{})

name := new(model.Name)
email := new(model.Email)
customer := &model.Customer{
    Name:         name,
    PrimaryEmail: email,
}
customer.Name.First = "Darko"
customer.Name.Last = "Luketic"
customer.Name.Middle = ""
customer.PrimaryEmail.Address = "my@mail.come"
customer.PrimaryEmail.Verified = true
tx := db.Begin()

if e := tx.Create(customer).Error; e != nil {
    tx.Rollback()
    log.Fatal("create customer", e)
}
tx.Commit()

我需要更改结构，以便它们有一个相关的字段。我确实对orm有更高的期望。这就是为什么它是一个ORM对象关系管理器。gorm在那里管理的并不多;)

package model

import "github.com/jinzhu/gorm"

type Customer struct {
    gorm.Model
    Name            *Name
    BillingAddress  *Address
    ShippingAddress *Address
    PrimaryEmail    *Email
    AlternateEmails []*Email
    Logindata       *Logindata
}

type Name struct {
    gorm.Model
    CustomerID uint
    First      string `json:"first"`
    Middle     string `json:"middle"`
    Last       string `json:"last"`
}

type Logindata struct {
    gorm.Model
    CustomerID uint
    Username   string
    Password   []byte
}

type Email struct {
    gorm.Model
    CustomerID uint
    Address    string
    Verified   bool
}

type Address struct {
    gorm.Model
    CustomerID uint
    Address1   string
    Address2   string
    City       string
    Code       string
    Country    string
}

请注意CustomerID uint