dsnap.Data() returns nil if the document does not exist

Question

I have written a controller GetUser to get a particular user from Database(Firestore) on the basis of id I put in the query. If the user is not present in the database then it should give the message that "User not found". But along with this message I am getting nil keyword also in response.

The response I am getting:

{
    "message": "User not found"
}null

When I hover on dsnap.Data() I get the information that

(firestore.DocumentSnapshot).Data on pkg.go.dev

Data returns the DocumentSnapshot's fields as a map. It is equivalent to

var m map[string]interface{}
d.DataTo(&m)
except that it returns nil if the document does not exist.

Controller:

func GetUser(c *gin.Context) {
    paramID := c.Params.ByName("id")
    ........
    ........
    ........
    dsnap, err := client.Collection("users").Doc(paramID).Get(ctx)
    if err != nil {
        fmt.Print(err)
        c.IndentedJSON(http.StatusNotFound, gin.H{
            "message": "User not found",
        })
    }
    m := dsnap.Data()
    c.IndentedJSON(http.StatusNotFound, gin.H(m))

}

Firestore reference link: https://pkg.go.dev/cloud.google.com/go/firestore@v1.6.1#DocumentSnapshot.Data

Can you guys please tell me how can I remove nil from the response? Thank you.

Answer 1

This problem is solved now. I write "return" after the User not found response.