Proper way for handling null value (nil)

[SebUndefined]

Hi,

How could we handle null value ? Sometimes we need to make the difference between empty string and null value for example (usually, the key is not set in the mongo document as far as I can see). A more relevant example is maybe the Int default value where 0 can be a valid value for our business logic, but "null" can as well.

Does a package like this could help ?

[mehran-prs]

Hi @SebUndefined
Just use pointers:

// User contains user information
type User struct {
	mgm.DefaultModel `bson:",inline"`
	Name             *string `json:"name"`
	Age              *int   `bson:"age"`
}

And if you want to omit empty values in your DB (by default nil values will be as null value on DB), you can use omitempty tag on your field.
e.g.,

// User contains user information
type User struct {
	mgm.DefaultModel `bson:",inline"`
	Name             *string `json:"name,omitempty"`
	Age              *int    `bson:"age,omitempty"`
}