未定义（无法引用未导出的字段或方法）

huangapple
go评论112阅读模式
英文:

undefined (cannot refer to unexported field or method)

问题

我正在尝试从models包中引用Users struct，并尝试从control中访问该模型。但是我遇到以下错误。

  1. controllers/user.go:87: user.create_date未定义（无法引用未导出的字段或方法create_date）
  2. controllers/user.go:88: user.update_date未定义（无法引用未导出的字段或方法update_date）
  3. controllers/user.go:104: user.user_id未定义（无法引用未导出的字段或方法user_id）
  4. controllers/user.go:119: user.update_date未定义（无法引用未导出的字段或方法update_date）
  5. controllers/user.go:136: user.user_id未定义（无法引用未导出的字段或方法user_id）
  6. controllers/user.go:151: user.update_date未定义（无法引用未导出的字段或方法update_date）
  7. controllers/user.go:166: user.user_id未定义（无法引用未导出的字段或方法user_id）

Models.go

  1. package models
  4. import(
  6. 	"time"
  7. )
  9.     type Users struct {
  10.     
  11.     		user_id                                      int      `json:"user_id" form:"user_id" gorm:"column:user_id"`
  12.     		user_login                                   string   `json:"user_login" form:"user_login" gorm:"column:user_login"` 
  13.     		user_email                                   string   `json:"user_email" form:"user_email" gorm:"column:user_email"` 
  14.     		user_password                                string   `json:"user_password" form:"user_password" gorm:"column:user_password"` 
  15.     		user_password_salt                           string   `json:"user_password_salt" form:"user_password_salt" gorm:"column:user_password_salt"` 
  16.     		user_2factor_secret                          string   `json:"user_2factor_secret" form:"user_2factor_secret" gorm:"column:user_2factor_secret"`
  17.     		user_fullname                                string   `json:"user_fullname" form:"user_fullname" gorm:"column:user_fullname"`
  18.     		user_description                             string   `json:"user_description" form:"user_description" gorm:"column:user_description"`
  19.     		user_enabled                                 string   `json:"user_enabled" form:"user_enabled" gorm:"column:user_enabled"`
  20.     		user_verified                                string   `json:"user_verified" form:"user_verified" gorm:"column:user_verified"`
  21.     		PublisherInfoID                              int      `json:"PublisherInfoID" form:"PublisherInfoID" gorm:"column:PublisherInfoID"`
  22.     		DemandCustomerInfoID                         int      `json:"DemandCustomerInfoID" form:"DemandCustomerInfoID" gorm:"column:DemandCustomerInfoID"`
  23.     		create_date                                  time.Time `json:"create_date" gorm:"column:create_date"`
  24.     		update_date                                  time.Time  `json:"update_date" gorm:"column:update_date"` 
  25.     		user_permission_cache						 string   `json:"user_permission_cache" form:"user_permission_cache" gorm:"column:user_permission_cache"`
  26.     		user_role                                    int      `json:"user_role" form:"user_role" gorm:"column:user_role"`
  27.     
  28.     	}

在controllers中

  1.    package controllers
  2.     
  3.     import (
  4.     	"time"
  5.     
  6.       "github.com/op/go-logging"
  7.     	"github.com/gin-gonic/gin"
  8.     	"github.com/jinzhu/gorm"
  9.       _ "github.com/go-sql-driver/mysql"
  10.     
  11.     	"../models"
  12.     )
  13.     
  14.     var loguser = logging.MustGetLogger("AdsAPI")
  15.     
  16.     type AdsControllerUser struct {
  17.     	DB gorm.DB
  18.     }
  19.     
  20.     func (ac *AdsControllerUser) SetDB(d gorm.DB) {
  21.     	ac.DB = d
  22.     	ac.DB.LogMode(true)
  23.     }
  24.     func (ac *AdsControllerUser) CreateUsers(c *gin.Context) {
  25.     
  26.       var user models.Users
  27.     
  28.       // This will infer what binder to use depending on the content-type header.
  29.       c.Bind(&user)
  30.     
  31.         // Update Timestamps
  32.         user.create_date = time.Now()
  33.         user.update_date = time.Now()
  34.     
  35.         err := ac.DB.Save(&user)
  36.         if err != nil {
  37.             loguser.Debugf("创建用户时出错，错误为'%v'", err)
  38.             res := gin.H{
  39.                     "status": "403",
  40.                     "error": "无法创建用户",
  41.             }
  42.             c.JSON(404, res)
  43.             return
  44.         }
  45.     
  46.         content := gin.H{
  47.                 "status": "201",
  48.                 "result": "成功",
  49.                 "UserID": user.user_id,
  50.             }
  51.     
  52.       c.Writer.Header().Set("Content-Type", "application/json")
  53.       c.JSON(201, content)
  54.     }
  56. func (ac *AdsControllerUser) UpdateUsers(c *gin.Context) {
  57.     // 获取id
  58.     id := c.Params.ByName("id")
  59.   var user models.Users
  61.   c.Bind(&user)
  63.     // 更新时间戳
  64.     user.update_date = time.Now()
  66.     //err := ac.DB.Model(&models.auth_User).Where("user_id = ?", id).Updates(&cm)
  67.     err := ac.DB.Where("user_id = ?", id).Updates(&user)
  68.     if err != nil {
  69.         loguser.Debugf("更新用户时出错，错误为'%v'", err)
  70.         res := gin.H{
  71.                 "status": "403",
  72.                 "error": "无法更新用户",
  73.         }
  74.         c.JSON(403, res)
  75.         return
  76.     }
  78.     content := gin.H{
  79.             "status": "201",
  80.             "result": "成功",
  81.             "UserID": user.user_id,
  82.         }
  84.     c.Writer.Header().Set("Content-Type", "application/json")
  85.     c.JSON(201, content)
  86. }
  88. func (ac *AdsControllerUser) DeleteUsers(c *gin.Context) {
  89.     // 获取id
  90.     id := c.Params.ByName("id")
  91.   var user models.Users
  93.   c.Bind(&user)
  95.     // 更新时间戳
  96.     user.update_date = time.Now()
  98.     err := ac.DB.Where("user_id = ?", id).Delete(&user)
  99.     if err != nil {
  100.         loguser.Debugf("删除用户时出错，错误为'%v'", err)
  101.         res := gin.H{
  102.                 "status": "403",
  103.                 "error": "无法删除用户",
  104.         }
  105.         c.JSON(403, res)
  106.         return
  107.     }
  109.     content := gin.H {
  110.             "result": "成功",
  111.             "UserID": user.user_id,
  112.         }
  114.   c.Writer.Header().Set("Content-Type", "application/json")
  115.   c.JSON(201, content)
  116. }
英文:

I'm trying to refer Users struct from the models package and trying to access the model from control.But I take following errors.

  1. controllers/user.go:87: user.create_date undefined (cannot refer to unexported field or method create_date)
  2. controllers/user.go:88: user.update_date undefined (cannot refer to unexported field or method update_date)
  3. controllers/user.go:104: user.user_id undefined (cannot refer to unexported field or method user_id)
  4. controllers/user.go:119: user.update_date undefined (cannot refer to unexported field or method update_date)
  5. controllers/user.go:136: user.user_id undefined (cannot refer to unexported field or method user_id)
  6. controllers/user.go:151: user.update_date undefined (cannot refer to unexported field or method update_date)
  7. controllers/user.go:166: user.user_id undefined (cannot refer to unexported field or method user_id)

Models.go

  1. package models
  4. import(
  6. 	"time"
  7. )
  9.     type Users struct {
  10.     
  11.     		user_id                                      int      `json:"user_id" form:"user_id" gorm:"column:user_id"`
  12.     		user_login                                   string   `json:"user_login" form:"user_login" gorm:"column:user_login"` 
  13.     		user_email                                   string   `json:"user_email" form:"user_email" gorm:"column:user_email"` 
  14.     		user_password                                string   `json:"user_password" form:"user_password" gorm:"column:user_password"` 
  15.     		user_password_salt                           string   `json:"user_password_salt" form:"user_password_salt" gorm:"column:user_password_salt"` 
  16.     		user_2factor_secret                          string   `json:"user_2factor_secret" form:"user_2factor_secret" gorm:"column:user_2factor_secret"`
  17.     		user_fullname                                string   `json:"user_fullname" form:"user_fullname" gorm:"column:user_fullname"`
  18.     		user_description                             string   `json:"user_description" form:"user_description" gorm:"column:user_description"`
  19.     		user_enabled                                 string   `json:"user_enabled" form:"user_enabled" gorm:"column:user_enabled"`
  20.     		user_verified                                string   `json:"user_verified" form:"user_verified" gorm:"column:user_verified"`
  21.     		PublisherInfoID                              int      `json:"PublisherInfoID" form:"PublisherInfoID" gorm:"column:PublisherInfoID"`
  22.     		DemandCustomerInfoID                         int      `json:"DemandCustomerInfoID" form:"DemandCustomerInfoID" gorm:"column:DemandCustomerInfoID"`
  23.     		create_date                                  time.Time `json:"create_date" gorm:"column:create_date"`
  24.     		update_date                                  time.Time  `json:"update_date" gorm:"column:update_date"` 
  25.     		user_permission_cache						 string   `json:"user_permission_cache" form:"user_permission_cache" gorm:"column:user_permission_cache"`
  26.     		user_role                                    int      `json:"user_role" form:"user_role" gorm:"column:user_role"`
  27.     
  28.     	}

in controllers

  1.    package controllers
  2.     
  3.     import (
  4.     	"time"
  5.     
  6.       "github.com/op/go-logging"
  7.     	"github.com/gin-gonic/gin"
  8.     	"github.com/jinzhu/gorm"
  9.       _ "github.com/go-sql-driver/mysql"
  10.     
  11.     	"../models"
  12.     )
  13.     
  14.     var loguser = logging.MustGetLogger("AdsAPI")
  15.     
  16.     type AdsControllerUser struct {
  17.     	DB gorm.DB
  18.     }
  19.     
  20.     func (ac *AdsControllerUser) SetDB(d gorm.DB) {
  21.     	ac.DB = d
  22.     	ac.DB.LogMode(true)
  23.     }
  24.     func (ac *AdsControllerUser) CreateUsers(c *gin.Context) {
  25.     
  26.       var user models.Users
  27.     
  28.       // This will infer what binder to use depending on the content-type header.
  29.       c.Bind(&user)
  30.     
  31.         // Update Timestamps
  32.         user.create_date = time.Now()
  33.         user.update_date = time.Now()
  34.     
  35.         err := ac.DB.Save(&user)
  36.         if err != nil {
  37.             loguser.Debugf("Error while creating a user, the error is '%v'", err)
  38.             res := gin.H{
  39.                     "status": "403",
  40.                     "error": "Unable to create user",
  41.             }
  42.             c.JSON(404, res)
  43.             return
  44.         }
  45.     
  46.         content := gin.H{
  47.                 "status": "201",
  48.                 "result": "Success",
  49.                 "UserID": user.user_id,
  50.             }
  51.     
  52.       c.Writer.Header().Set("Content-Type", "application/json")
  53.       c.JSON(201, content)
  54.     }
  56. func (ac *AdsControllerUser) UpdateUsers(c *gin.Context) {
  57.     // Grab id
  58.     id := c.Params.ByName("id")
  59.   var user models.Users
  61.   c.Bind(&user)
  63.     // Update Timestamps
  64.     user.update_date = time.Now()
  66.     //err := ac.DB.Model(&models.auth_User).Where("user_id = ?", id).Updates(&cm)
  67.     err := ac.DB.Where("user_id = ?", id).Updates(&user)
  68.     if err != nil {
  69.         loguser.Debugf("Error while updating a user, the error is '%v'", err)
  70.         res := gin.H{
  71.                 "status": "403",
  72.                 "error": "Unable to update user",
  73.         }
  74.         c.JSON(403, res)
  75.         return
  76.     }
  78.     content := gin.H{
  79.             "status": "201",
  80.             "result": "Success",
  81.             "UserID": user.user_id,
  82.         }
  84.     c.Writer.Header().Set("Content-Type", "application/json")
  85.     c.JSON(201, content)
  86. }
  88. func (ac *AdsControllerUser) DeleteUsers(c *gin.Context) {
  89.     // Grab id
  90.     id := c.Params.ByName("id")
  91.   var user models.Users
  93.   c.Bind(&user)
  95.     // Update Timestamps
  96.     user.update_date = time.Now()
  98.     err := ac.DB.Where("user_id = ?", id).Delete(&user)
  99.     if err != nil {
  100.         loguser.Debugf("Error while deleting a user, the error is '%v'", err)
  101.         res := gin.H{
  102.                 "status": "403",
  103.                 "error": "Unable to delete user",
  104.         }
  105.         c.JSON(403, res)
  106.         return
  107.     }
  109.     content := gin.H {
  110.             "result": "Success",
  111.             "UserID": user.user_id,
  112.         }
  114.   c.Writer.Header().Set("Content-Type", "application/json")
  115.   c.JSON(201, content)
  116. }

答案1

得分: 22

在另一个包中引用结构体时，对导出字段使用大写字母。

  1. package models
  3. import (
  4.     "time"
  5. )
  7. type Users struct {
  8.     ID                   int       `json:"user_id" form:"user_id" gorm:"column:user_id"`
  9.     Login                string    `json:"user_login" form:"user_login" gorm:"column:user_login"`
  10.     Email                string    `json:"user_email" form:"user_email" gorm:"column:user_email"`
  11.     Password             string    `json:"user_password" form:"user_password" gorm:"column:user_password"`
  12.     PasswordSalt         string    `json:"user_password_salt" form:"user_password_salt" gorm:"column:user_password_salt"`
  13.     TwoFactorSecret      string    `json:"user_2factor_secret" form:"user_2factor_secret" gorm:"column:user_2factor_secret"`
  14.     Fullname             string    `json:"user_fullname" form:"user_fullname" gorm:"column:user_fullname"`
  15.     Description          string    `json:"user_description" form:"user_description" gorm:"column:user_description"`
  16.     Enabled              string    `json:"user_enabled" form:"user_enabled" gorm:"column:user_enabled"`
  17.     Verified             string    `json:"user_verified" form:"user_verified" gorm:"column:user_verified"`
  18.     PublisherInfoID      int       `json:"PublisherInfoID" form:"PublisherInfoID" gorm:"column:PublisherInfoID"`
  19.     DemandCustomerInfoID int       `json:"DemandCustomerInfoID" form:"DemandCustomerInfoID" gorm:"column:DemandCustomerInfoID"`
  20.     CreateDate           time.Time `json:"create_date" gorm:"column:create_date"`
  21.     UpdateDate           time.Time `json:"update_date" gorm:"column:update_date"`
  22.     PermissionCache      string    `json:"user_permission_cache" form:"user_permission_cache" gorm:"column:user_permission_cache"`
  23.     Role                 int       `json:"user_role" form:"user_role" gorm:"column:user_role"`
  24. }

现在可以使用 Users.ID 来获取字段。

英文:

Use Capitals for exported fields in struct, when referring struct in another package.

  1. package models
  3. import (
  4.     "time"
  5. )
  7. type Users struct {
  8.     ID                   int       `json:"user_id" form:"user_id" gorm:"column:user_id"`
  9.     Login                string    `json:"user_login" form:"user_login" gorm:"column:user_login"`
  10.     Email                string    `json:"user_email" form:"user_email" gorm:"column:user_email"`
  11.     Password             string    `json:"user_password" form:"user_password" gorm:"column:user_password"`
  12.     PasswordSalt         string    `json:"user_password_salt" form:"user_password_salt" gorm:"column:user_password_salt"`
  13.     TwoFactorSecret      string    `json:"user_2factor_secret" form:"user_2factor_secret" gorm:"column:user_2factor_secret"`
  14.     Fullname             string    `json:"user_fullname" form:"user_fullname" gorm:"column:user_fullname"`
  15.     Description          string    `json:"user_description" form:"user_description" gorm:"column:user_description"`
  16.     Enabled              string    `json:"user_enabled" form:"user_enabled" gorm:"column:user_enabled"`
  17.     Verified             string    `json:"user_verified" form:"user_verified" gorm:"column:user_verified"`
  18.     PublisherInfoID      int       `json:"PublisherInfoID" form:"PublisherInfoID" gorm:"column:PublisherInfoID"`
  19.     DemandCustomerInfoID int       `json:"DemandCustomerInfoID" form:"DemandCustomerInfoID" gorm:"column:DemandCustomerInfoID"`
  20.     CreateDate           time.Time `json:"create_date" gorm:"column:create_date"`
  21.     UpdateDate           time.Time `json:"update_date" gorm:"column:update_date"`
  22.     PermissionCache      string    `json:"user_permission_cache" form:"user_permission_cache" gorm:"column:user_permission_cache"`
  23.     Role                 int       `json:"user_role" form:"user_role" gorm:"column:user_role"`
  24. }

Now do Users.ID to get fields.

huangapple
  • 本文由 发表于 2016年3月5日 15:05:17
  • 转载请务必保留本文链接：https://go.coder-hub.com/35811215.html
  • go
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