how to change the values of an array to an empty string or an empty array in golang?-CodePudding

i have code which contains some nested array values. as follows:

   `
    var descriptor models.Descriptor
    _ = json.NewDecoder(r.Body).Decode(&descriptor)
    result, _ := collectionDescriptor.InsertOne(context.TODO(), descriptor)

type Descriptor struct {
    Id      string `json:"id" bson:"id"`
    Type    string `json:"type,omitempty" bson:"type,omitempty"`
    Name    string `json:"name,omitempty" bson:"name,omitempty"`
    Version string `json:"version,omitempty" bson:"version,omitempty"`
    Modules []string `json:"modules,omitempty" bson:"modules,omitempty"`
    Configs []Config `json:"configs" bson:"configs"`
    
}
type Config struct {
    Id       string `json:"id" bson:"id"`
    Type     string `json:"type,omitempty" bson:"type,omitempty"`
    Name     string `json:"name,omitempty" bson:"name,omitempty"`
    Protocol []Protocols `json:"protocol" bson:"protocol"`
}
type Protocols struct {
    Id    string `json:"id" bson:"id"`
    Type  string `json:"type,omitempty" bson:"type,omitempty"`
    Name  string `json:"name" bson:"name,omitempty"`
    Items []Itemes `json:"items" bson:"items"`
}

descriptor.Configs[0].Protocol[0] = nil

config = descriptor.Configs[0]
_ = json.NewDecoder(r.Body).Decode(&config)

conf, errr := collectionConfigDes.InsertOne(context.TODO(), config)
json.NewEncoder(w).Encode(conf)`

I want to remove the value in descriptor.configs[0].protocol to be an empty array or an empty string. which I will then send to mongoDB. json form like below

Different approaches (on JSON) are,

1.1. Remove omitempty from Protocol field. This gives null in JSON.

Protocol []Protocols `json:"protocol" bson:"protocol"`

1.2. Remove omitempty like above; and use make as @Sangria mentioned. This gives empty array/slice in JSON.

desc[0].Configs[0].Protocol = make([]Protocols, 0)

Null Value	Empty Array

This works for JSON at least. Is there any issue to insert the same into Mongo? Try the 3 possibilities.

Doesn't matter if you are storing the record as a new one. But in case of editing the existing, you should be using collection.UpdateOne() in Mongo.