getting error message along with result in go api

Question

I have one route in API where I can get users with roles. In this route, if I put the name of the user then I will get all the roles assigned to him/her. But the problem is that it returns only the first result. If that role is present in another object then it is not getting displayed. So I comment on the return line and everything works fine but along with the result, I am getting the error message:"user not found" Can you guys please tell me what mistake I am doing?
Thank you.
Route -

GET("/users/:username", controllers.GetUserByRole)

Controller -

func GetUserByRole(c *gin.Context) {
    paramId := c.Param("username")
    .............
    .............
    .............
    var newUsers []models.User
    iter := client.Collection("users").Documents(ctx)

    for {
        doc, err := iter.Next()
        if err == iterator.Done {
            break
        }
        if err != nil {
            log.Fatalf("Failed to iterate: %v", err)
        }

        var tempUsers models.User
        if err := doc.DataTo(&tempUsers); err != nil {
            break
        }
        newUsers = append(newUsers, tempUsers)
    }

    for _, a := range newUsers {
        for _, element := range a.Roles{
                if element == paramId {
            c.IndentedJSON(http.StatusOK, a)
            return     //if I comment this line line then I geting message `"user not found"` along with results
        }
    }
    }
    c.IndentedJSON(http.StatusNotFound, gin.H{"message": "user not found"})
}

URL: http://localhost:3000/users/Analyst
Response Should be:

  {
     "id": 1,
     "name": "Leanne Graham",
     "username": "Bret",
     "roles": ["Developer", "Analyst"],
  },
  {
    "id": 3,
    "name": "Clementine Bauch",
    "username": "Samantha",
    "roles": ["Manger", "Analyst"],
  }

but I am getting like this (only the first matching one):

  {
     "id": 1,
     "name": "Leanne Graham",
     "username": "Bret",
     "roles": ["Developer", "Analyst"],
  }

If I comment the return line then response is (desired result + error message):

  {
     "id": 1,
     "name": "Leanne Graham",
     "username": "Bret",
     "roles": ["Developer", "Analyst"],
  },
  {
    "id": 3,
    "name": "Clementine Bauch",
    "username": "Samantha",
    "roles": ["Manger", "Analyst"],
  }{
    "message": "album not found"
}

Complete API response -

[
  {
     "id": 1,
     "name": "Leanne Graham",
     "username": "Bret",
     "roles": ["Developer", "Analyst"],
  },
  {
    "id": 2,
    "name": "Ervin Howell",
    "username": "Antonette",
    "roles": ["Assistant"],,
  },
  {
    "id": 3,
    "name": "Clementine Bauch",
    "username": "Samantha",
    "roles": ["Manger", "Analyst"],
  }
]

Answer 1

You can do like this

var userList []models.User
for _, a := range newUsers {
    for _, element := range a.AssignedTo {
        if element == paramId {
            userList = append(userList, a)
        }
    }
}
if len(userList) == 0 {
     c.IndentedJSON(http.StatusNotFound, gin.H{"message": "user not found"})
     return
}

c.IndentedJSON(http.StatusOK, userList)