如何在Gorm中按角色筛选用户？_Go_Go Gorm

如何在Gorm中按角色筛选用户？

如何在Gorm中按角色筛选用户？,go,go-gorm,Go,Go Gorm,我在理解文档时发现了一些问题。我使用了RESTAPI和Go，并尝试创建一个端点，在这里我只需要根据用户的角色提取用户。我尝试了不同的解决方案，但无法实现我所需要的。这就是我所做的，我不知道如何继续，所以我只能通过确切的角色来使用用户。如果有人能帮助我，我将不胜感激，因为我在文档中找不到更高级的东西来自此端点的JSON响应是： [ { "ID": 1, "CreatedAt": "2020-12-09T14

我在理解文档时发现了一些问题。我使用了RESTAPI和Go，并尝试创建一个端点，在这里我只需要根据用户的角色提取用户。我尝试了不同的解决方案，但无法实现我所需要的。这就是我所做的，我不知道如何继续，所以我只能通过确切的角色来使用用户。如果有人能帮助我，我将不胜感激，因为我在文档中找不到更高级的东西

来自此端点的JSON响应是：

[
    {
        "ID": 1,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "h@go.com",
        "password": "$2a$14$KN2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGciOiJIUzI1NiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTySt0fil4c",
        "first_name": "H",
        "last_name": "Pro",
        "phone": "353456",
        "salesforce_id": "sfsdddfsdf",
        "webflow_id": "wfwfwfaawfw",
        "Roles": null
    },
    {
        "ID": 2,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "s@go.com",
        "password": "$2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTy0fil4c",
        "first_name": "S",
        "last_name": "Test",
        "phone": "3556",
        "salesforce_id": "sfsdf",
        "webflow_id": "wfwfwfw",
        "Roles": null
    }
]

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []*Roles `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

SELECT * FROM users
JOIN user_roles ON users.id = user_roles.user_id
JOIN roles ON user_roles.roles_id = roles.id
WHERE user_roles.roles_id = 1

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Roles  `json:"roles" gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

func (h *Handler) GetAllEmployees(c *gin.Context) {
    var users []models.User
    //var roles []models.Roles //the comment here is because I get error message roles is defined but never used
    var roleid int = 1
    //you need to extract roleID from your query string or request body
    
    tx := h.db.DB.
          Preload("Roles").
          Joins("INNER JOIN user_roles ON users.id = user_roles.user.id").
          Joins("INNER JOIN roles ON user_roles.roles_id = roles.id").
          Where("user_roles.roles_id = ?", roleid).
          Find(&users)

    if tx.Error != nil {
      //handle error
    }
    c.JSON(200, users)
}

用户结构：

[
    {
        "ID": 1,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "h@go.com",
        "password": "$2a$14$KN2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGciOiJIUzI1NiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTySt0fil4c",
        "first_name": "H",
        "last_name": "Pro",
        "phone": "353456",
        "salesforce_id": "sfsdddfsdf",
        "webflow_id": "wfwfwfaawfw",
        "Roles": null
    },
    {
        "ID": 2,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "s@go.com",
        "password": "$2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTy0fil4c",
        "first_name": "S",
        "last_name": "Test",
        "phone": "3556",
        "salesforce_id": "sfsdf",
        "webflow_id": "wfwfwfw",
        "Roles": null
    }
]

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []*Roles `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

SELECT * FROM users
JOIN user_roles ON users.id = user_roles.user_id
JOIN roles ON user_roles.roles_id = roles.id
WHERE user_roles.roles_id = 1

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Roles  `json:"roles" gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

func (h *Handler) GetAllEmployees(c *gin.Context) {
    var users []models.User
    //var roles []models.Roles //the comment here is because I get error message roles is defined but never used
    var roleid int = 1
    //you need to extract roleID from your query string or request body
    
    tx := h.db.DB.
          Preload("Roles").
          Joins("INNER JOIN user_roles ON users.id = user_roles.user.id").
          Joins("INNER JOIN roles ON user_roles.roles_id = roles.id").
          Where("user_roles.roles_id = ?", roleid).
          Find(&users)

    if tx.Error != nil {
      //handle error
    }
    c.JSON(200, users)
}

角色结构：

[
    {
        "ID": 1,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "h@go.com",
        "password": "$2a$14$KN2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGciOiJIUzI1NiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTySt0fil4c",
        "first_name": "H",
        "last_name": "Pro",
        "phone": "353456",
        "salesforce_id": "sfsdddfsdf",
        "webflow_id": "wfwfwfaawfw",
        "Roles": null
    },
    {
        "ID": 2,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "s@go.com",
        "password": "$2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTy0fil4c",
        "first_name": "S",
        "last_name": "Test",
        "phone": "3556",
        "salesforce_id": "sfsdf",
        "webflow_id": "wfwfwfw",
        "Roles": null
    }
]

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []*Roles `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

SELECT * FROM users
JOIN user_roles ON users.id = user_roles.user_id
JOIN roles ON user_roles.roles_id = roles.id
WHERE user_roles.roles_id = 1

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Roles  `json:"roles" gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

func (h *Handler) GetAllEmployees(c *gin.Context) {
    var users []models.User
    //var roles []models.Roles //the comment here is because I get error message roles is defined but never used
    var roleid int = 1
    //you need to extract roleID from your query string or request body
    
    tx := h.db.DB.
          Preload("Roles").
          Joins("INNER JOIN user_roles ON users.id = user_roles.user.id").
          Joins("INNER JOIN roles ON user_roles.roles_id = roles.id").
          Where("user_roles.roles_id = ?", roleid).
          Find(&users)

    if tx.Error != nil {
      //handle error
    }
    c.JSON(200, users)
}

我在Postgre中为我的案例进行的sql查询：

[
    {
        "ID": 1,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "h@go.com",
        "password": "$2a$14$KN2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGciOiJIUzI1NiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTySt0fil4c",
        "first_name": "H",
        "last_name": "Pro",
        "phone": "353456",
        "salesforce_id": "sfsdddfsdf",
        "webflow_id": "wfwfwfaawfw",
        "Roles": null
    },
    {
        "ID": 2,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "s@go.com",
        "password": "$2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTy0fil4c",
        "first_name": "S",
        "last_name": "Test",
        "phone": "3556",
        "salesforce_id": "sfsdf",
        "webflow_id": "wfwfwfw",
        "Roles": null
    }
]

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []*Roles `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

SELECT * FROM users
JOIN user_roles ON users.id = user_roles.user_id
JOIN roles ON user_roles.roles_id = roles.id
WHERE user_roles.roles_id = 1

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Roles  `json:"roles" gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

func (h *Handler) GetAllEmployees(c *gin.Context) {
    var users []models.User
    //var roles []models.Roles //the comment here is because I get error message roles is defined but never used
    var roleid int = 1
    //you need to extract roleID from your query string or request body
    
    tx := h.db.DB.
          Preload("Roles").
          Joins("INNER JOIN user_roles ON users.id = user_roles.user.id").
          Joins("INNER JOIN roles ON user_roles.roles_id = roles.id").
          Where("user_roles.roles_id = ?", roleid).
          Find(&users)

    if tx.Error != nil {
      //handle error
    }
    c.JSON(200, users)
}

用户结构：

[
    {
        "ID": 1,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "h@go.com",
        "password": "$2a$14$KN2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGciOiJIUzI1NiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTySt0fil4c",
        "first_name": "H",
        "last_name": "Pro",
        "phone": "353456",
        "salesforce_id": "sfsdddfsdf",
        "webflow_id": "wfwfwfaawfw",
        "Roles": null
    },
    {
        "ID": 2,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "s@go.com",
        "password": "$2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTy0fil4c",
        "first_name": "S",
        "last_name": "Test",
        "phone": "3556",
        "salesforce_id": "sfsdf",
        "webflow_id": "wfwfwfw",
        "Roles": null
    }
]

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []*Roles `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

SELECT * FROM users
JOIN user_roles ON users.id = user_roles.user_id
JOIN roles ON user_roles.roles_id = roles.id
WHERE user_roles.roles_id = 1

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Roles  `json:"roles" gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

func (h *Handler) GetAllEmployees(c *gin.Context) {
    var users []models.User
    //var roles []models.Roles //the comment here is because I get error message roles is defined but never used
    var roleid int = 1
    //you need to extract roleID from your query string or request body
    
    tx := h.db.DB.
          Preload("Roles").
          Joins("INNER JOIN user_roles ON users.id = user_roles.user.id").
          Joins("INNER JOIN roles ON user_roles.roles_id = roles.id").
          Where("user_roles.roles_id = ?", roleid).
          Find(&users)

    if tx.Error != nil {
      //handle error
    }
    c.JSON(200, users)
}

角色结构

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

端点：

[
    {
        "ID": 1,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "h@go.com",
        "password": "$2a$14$KN2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGciOiJIUzI1NiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTySt0fil4c",
        "first_name": "H",
        "last_name": "Pro",
        "phone": "353456",
        "salesforce_id": "sfsdddfsdf",
        "webflow_id": "wfwfwfaawfw",
        "Roles": null
    },
    {
        "ID": 2,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "s@go.com",
        "password": "$2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTy0fil4c",
        "first_name": "S",
        "last_name": "Test",
        "phone": "3556",
        "salesforce_id": "sfsdf",
        "webflow_id": "wfwfwfw",
        "Roles": null
    }
]

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []*Roles `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

SELECT * FROM users
JOIN user_roles ON users.id = user_roles.user_id
JOIN roles ON user_roles.roles_id = roles.id
WHERE user_roles.roles_id = 1

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Roles  `json:"roles" gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

func (h *Handler) GetAllEmployees(c *gin.Context) {
    var users []models.User
    //var roles []models.Roles //the comment here is because I get error message roles is defined but never used
    var roleid int = 1
    //you need to extract roleID from your query string or request body
    
    tx := h.db.DB.
          Preload("Roles").
          Joins("INNER JOIN user_roles ON users.id = user_roles.user.id").
          Joins("INNER JOIN roles ON user_roles.roles_id = roles.id").
          Where("user_roles.roles_id = ?", roleid).
          Find(&users)

    if tx.Error != nil {
      //handle error
    }
    c.JSON(200, users)
}

编辑：

[
    {
        "ID": 1,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "h@go.com",
        "password": "$2a$14$KN2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGciOiJIUzI1NiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTySt0fil4c",
        "first_name": "H",
        "last_name": "Pro",
        "phone": "353456",
        "salesforce_id": "sfsdddfsdf",
        "webflow_id": "wfwfwfaawfw",
        "Roles": null
    },
    {
        "ID": 2,
        "CreatedAt": "2020-12-09T14:40:55.171011+02:00",
        "UpdatedAt": "2020-12-09T14:40:55.175537+02:00",
        "DeletedAt": null,
        "email": "s@go.com",
        "password": "$2wAOnfecAriBW0xeAJke.okEUlcpDHVeuk",
        "bearer": "eyJhbGiIs2lhdCI6MTYwNjMwNTEzNn0.J2wBp8ecA9TebP6L73qZ1OZmo02DwQy9vTy0fil4c",
        "first_name": "S",
        "last_name": "Test",
        "phone": "3556",
        "salesforce_id": "sfsdf",
        "webflow_id": "wfwfwfw",
        "Roles": null
    }
]

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []*Roles `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

type Roles struct {
    gorm.Model
    Name string `json:"name"`
    Users []*User `gorm:"many2many:user_roles"`
}

SELECT * FROM users
JOIN user_roles ON users.id = user_roles.user_id
JOIN roles ON user_roles.roles_id = roles.id
WHERE user_roles.roles_id = 1

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Roles  `json:"roles" gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

func (h *Handler) GetAllEmployees(c *gin.Context) {
    var users []models.User
    //var roles []models.Roles //the comment here is because I get error message roles is defined but never used
    var roleid int = 1
    //you need to extract roleID from your query string or request body
    
    tx := h.db.DB.
          Preload("Roles").
          Joins("INNER JOIN user_roles ON users.id = user_roles.user.id").
          Joins("INNER JOIN roles ON user_roles.roles_id = roles.id").
          Where("user_roles.roles_id = ?", roleid).
          Find(&users)

    if tx.Error != nil {
      //handle error
    }
    c.JSON(200, users)
}

根据以下所有答案，这里需要发生以下事情：

您需要将

角色

结构重命名为

角色

您需要为每个对象加载

角色

按特定角色ID筛选用户

首先，您需要将

角色

结构重命名为

角色

，并更改对它的引用：

角色结构

type Role struct {
    gorm.Model
    Name string `json:"name"`
    Users []User `gorm:"many2many:user_roles"`
}

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Role `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

用户结构

type Role struct {
    gorm.Model
    Name string `json:"name"`
    Users []User `gorm:"many2many:user_roles"`
}

type User struct {
    gorm.Model
    Email        string  `json:"email"`
    Password     string  `json:"password"`
    Token        string  `json:"bearer"`
    FirstName    string  `json:"first_name"`
    LastName     string  `json:"last_name"`
    Phone        string  `json:"phone"`
    SalesforceID string  `json:"salesforce_id"`
    WebflowID    string  `json:"webflow_id"`
    Roles        []Role `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;many2many:user_roles;"`
}

接下来，稍微修改一下代码。这里有一个连接是不必要的：

func (h *Handler) GetAllEmployeesByRoleID(c *gin.Context) {
        var users []models.User
        var roleID int = 1
        //you need to extract roleID from your query string or request body
        
        tx := h.db.DB.
              Preload("Roles").
              Joins("INNER JOIN user_roles ur ON ur.user_id = users.id").
              Where("ur.role_id = ?", roleID).
              Find(&users)

        if tx.Error != nil {
          //handle error
          c.JSON(500, tx.Error)
          return
        }  
        
        c.JSON(200, users)
}

因此，您添加了

Preload（“Roles”）

来加载用户可以拥有的所有角色，正如我假设的那样，即使您通过

roleID

进行筛选，您也希望看到用户可以拥有的所有角色

您可以使用

连接

和

Where

来构造您已经使用过的类似查询。

与角色
表连接

是不必要的，因为您在

用户角色

表中有所需的信息。

基本上，您希望将

角色

加载到每个

用户

对象中，并按角色ID筛选用户？@Eminaletovic是的，完全正确。现在，正如您从json中看到的，我得到了角色列表，因为我将角色定义为一个数组，我编辑查询以满足我的需要，并且响应为空。另外，我可能不明白您的意思，因为var角色和var roleID表示未使用它们，IDE将它们标记为错误。您希望通过哪个角色ID过滤用户？您是将其传递给此端点方法还是硬编码的？我在Roles表中有id=1的role id字段，我将其分配给userif role id为1，然后硬编码。只需将其更改为

var roleID int=1

或

roleID:=1

。我现在明白了。它仍然给我null作为响应，这对我来说非常奇怪