如何在控制器中导入模型？

huangapple
go评论119阅读模式
英文:

how to import models in controllers

问题

以下是我的代码模型。

  1. package models
  3. type Goal struct {
  4.   Id        int    `json:"id"`
  5.   Title     string `json:"title"`
  6.   Status    bool   `json:"status"`
  7. }

当我在控制器中导入models包并想要使用它时，它给我一个错误。

  1. package controllers
  3. import (
  4. 	"strconv"
  5. 	"github.com/gofiber/fiber/v2"
  6. 	"github.com/RohitKuwar/go_fiber/models"  //错误："github.com/RohitKuwar/go_fiber/models"导入但未使用
  7. )
  9. var goals = []models.Goal{     //错误：未声明名称：Goal
  10. 	{
  11. 		Id:        1,
  12. 		Title:     "Read about Promises",
  13. 		Status:    true,
  14. 	},
  15. 	{
  16. 		Id:        2,
  17. 		Title:     "Read about Closures",
  18. 		Status:    false,
  19. 	},
  20. }
  22. func GetGoals(c *fiber.Ctx) error {
  23. 	return c.Status(fiber.StatusOK).JSON(goals)
  24. }
  26. func CreateGoal(c *fiber.Ctx) error {
  27. 	type Request struct {
  28. 		Title 	string 	`json:"title"`
  29. 		Status  string  `json:"status"`
  30. 	}
  32. 	var body Request
  34. 	err := c.BodyParser(&body)
  36. 	// 如果出错
  37. 	if err != nil {
  38. 		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
  39. 			"message": "无法解析JSON",
  40. 			"error":   err,
  41. 		})
  42. 	}
  44. 	// 创建一个目标变量
  45. 	goal := &models.Goal{     //错误：未声明名称：Goal
  46. 		Id:        len(goals) + 1,
  47. 		Title:     body.Title,
  48. 		Status:    body.Status,
  49. 	}

但是当我在控制器中像下面这样写models时，一切都正常工作。

  1. import (
  2. 	"strconv"
  3. 	"github.com/gofiber/fiber/v2"
  4. )
  6. type Goal struct {
  7.   Id        int    `json:"id"`
  8.   Title     string `json:"title"`
  9.   Status    string  `json:"status"`
  10. }
  12. var goals = []Goal{
  13. 	{
  14. 		Id:        1,
  15. 		Title:     "Read about Promises",
  16. 		Status:    "completed",
  17. 	},
  18. 	{
  19. 		Id:        2,
  20. 		Title:     "Read about Closures",
  21. 		Status:    "active",
  22. 	},
  23. }
  24. func GetGoals(c *fiber.Ctx) error {
  25. 	return c.Status(fiber.StatusOK).JSON(goals)
  26. }

但是我不想在控制器代码中使用models代码。我想将模型保留在models文件夹中。我想将models和controllers放在不同的文件夹中。我认为在控制器中导入models包或在models中导入controllers包时我做错了什么。我不明白如何做到这一点。你们能帮帮我吗？提前谢谢。

英文:

Below is the model for my code.

  1. package models
  3. type Goal struct {
  4.   Id        int    `json:"id"`
  5.   Title     string `json:"title"`
  6.   Status 		bool   `json:"status"`
  7. }

When I import models package in controllers and want to use so it give me an errror.

  1. package controllers
  3. import (
  4. 	"strconv"
  5. 	"github.com/gofiber/fiber/v2"
  6. 	"github.com/RohitKuwar/go_fiber/models"  //error:"github.com/RohitKuwar/go_fiber/models" imported but not used
  7. )
  9. var goals = []Goal{     //error:undeclared name: Goal
  10. 	{
  11. 		Id:        1,
  12. 		Title:     "Read about Promises",
  13. 		Status:    "completed",
  14. 	},
  15. 	{
  16. 		Id:        2,
  17. 		Title:     "Read about Closures",
  18. 		Status:    "active",
  19. 	},
  20. }
  22. func GetGoals(c *fiber.Ctx) error {
  23. 	return c.Status(fiber.StatusOK).JSON(goals)
  24. }
  26. func CreateGoal(c *fiber.Ctx) error {
  27. 	type Request struct {
  28. 		Title 	string 	`json:"title"`
  29. 		Status  string  `json:"status"`
  30. 	}
  32. 	var body Request
  34. 	err := c.BodyParser(&body)
  36. 	// if error
  37. 	if err != nil {
  38. 		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
  39. 			"message": "Cannot parse JSON",
  40. 			"error":   err,
  41. 		})
  42. 	}
  44. 	// create a goal variable
  45. 	goal := &Goal{     //error:undeclared name: Goal
  46. 		Id:        len(goals) + 1,
  47. 		Title:     body.Title,
  48. 		Status: 	 body.Status,
  49. 	}

But when I write models in the controller like below then everything works fine.

  1. import (
  2. 	"strconv"
  3. 	"github.com/gofiber/fiber/v2"
  4. )
  6. type Goal struct {
  7.   Id        int    `json:"id"`
  8.   Title     string `json:"title"`
  9.   Status    string  `json:"status"`
  10. }
  12. var goals = []Goal{
  13. 	{
  14. 		Id:        1,
  15. 		Title:     "Read about Promises",
  16. 		Status:    "completed",
  17. 	},
  18. 	{
  19. 		Id:        2,
  20. 		Title:     "Read about Closures",
  21. 		Status:    "active",
  22. 	},
  23. }
  24. func GetGoals(c *fiber.Ctx) error {
  25. 	return c.Status(fiber.StatusOK).JSON(goals)
  26. }

But I do not want to use models code in controllers code. I want to keep the model in the models folder. I want to keep models and controllers in separate folders. I think I am doing something wrong while importing models package in controllers or controllers package in models. I am not understanding how can I do it. Can you guys please help me? Thank you in advance.

答案1

得分: 0

你的go.mod文件是什么样子的？我尝试使用以下目录结构和go.mod中的模块条目来运行你的代码，看起来像这样：module rishabh96b/go_fiber

  1. ➜  go_fiber tree .
  2. .
  3. ├── controllers
  4. │   └── mycontroller.go
  5. ├── go.mod
  6. ├── go.sum
  7. └── models
  8.     └── goals.go

在我的情况下，成功导入了控制器中的models包。下面是mycontroller.go文件的内容：

  1. package controllers
  3. import (
  4.     . "rishabh96b/go_fiber/models"
  6.     "github.com/gofiber/fiber/v2"
  7. )
  9. var goals = []Goal{ //错误：未声明的名称：Goal
  10.     {
  11. 	    Id:     1,
  12. 	    Title:  "Read about Promises",
  13. 	    Status: "completed",
  14.     },
  15.     {
  16. 	Id:     2,
  17. 	Title:  "Read about Closures",
  18. 	Status: "active",
  19.     },
  20. }
  22. func GetGoals(c *fiber.Ctx) error {
  23.     return c.Status(fiber.StatusOK).JSON(goals)
  24. }
  26. func CreateGoal(c *fiber.Ctx) error {
  27.     type Request struct {
  28. 	    Title  string `json:"title"`
  29. 	    Status string `json:"status"`
  30.     }
  32. var body Request
  34. err := c.BodyParser(&body)
  36. // 如果出错
  37. if err != nil {
  38. 	return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
  39. 		"message": "无法解析JSON",
  40. 		"error":   err,
  41. 	})
  42. }
  44. // 创建一个goal变量
  45. goal := &Goal{ //错误：未声明的名称：Goal
  46. 	Id:     len(goals) + 1,
  47. 	Title:  body.Title,
  48. 	Status: body.Status,
  49.     }
  50. }

P.S："rishabh96b/go_fiber/models"前面的.意味着我不必在这里使用包名与结构体一起使用。简而言之，我可以简单地使用Goal{}而不是models.Goal{}。

英文:

How does your go.mod file looks like? I tried to work your code with the following directory structure with the module entry in go.mod looking like module rishabh96b/go_fiber

  1. ➜  go_fiber tree .
  2. .
  3. ├── controllers
  4. │   └── mycontroller.go
  5. ├── go.mod
  6. ├── go.sum
  7. └── models
  8.     └── goals.go

Importing models package in controller is successful in my case. Here is how mycontroller.go file looks like

  1. package controllers
  3. import (
  4.     . "rishabh96b/go_fiber/models"
  6.     "github.com/gofiber/fiber/v2"
  7. )
  9. var goals = []Goal{ //error:undeclared name: Goal
  10.     {
  11. 	    Id:     1,
  12. 	    Title:  "Read about Promises",
  13. 	    Status: "completed",
  14.     },
  15.     {
  16. 	Id:     2,
  17. 	Title:  "Read about Closures",
  18. 	Status: "active",
  19.     },
  20. }
  22. func GetGoals(c *fiber.Ctx) error {
  23.     return c.Status(fiber.StatusOK).JSON(goals)
  24. }
  26. func CreateGoal(c *fiber.Ctx) error {
  27.     type Request struct {
  28. 	    Title  string `json:"title"`
  29. 	    Status string `json:"status"`
  30.     }
  32. var body Request
  34. err := c.BodyParser(&body)
  36. // if error
  37. if err != nil {
  38. 	return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
  39. 		"message": "Cannot parse JSON",
  40. 		"error":   err,
  41. 	})
  42. }
  44. // create a goal variable
  45. goal := &Goal{ //error:undeclared name: Goal
  46. 	Id:     len(goals) + 1,
  47. 	Title:  body.Title,
  48. 	Status: body.Status,
  49.     }
  50. }

P.S: The . in front of "rishabh96b/go_fiber/models" means that I don't have to use package name with struct I am using here. In short, I can simply use Goal{} instead of models.Goal{}

huangapple
  • 本文由 发表于 2021年8月19日 15:40:12
  • 转载请务必保留本文链接：https://go.coder-hub.com/68843808.html
  • go
  • model-view-controller
  • package
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