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How to get any data from Google Datastore as an untyped map
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| package main | |
| type DynamicEntity map[string]interface{} | |
| func (d *DynamicEntity) Load(props []datastore.Property) error { | |
| loadMap(*d, props) | |
| return nil | |
| } | |
| func loadMap(m map[string]interface{}, props []datastore.Property) { | |
| for _, prop := range props { | |
| if nested, ok := prop.Value.(*datastore.Entity); ok { | |
| mm := make(map[string]interface{}) | |
| loadMap(mm, nested.Properties) | |
| m[prop.Name] = mm | |
| } else if nestedArray, ok := prop.Value.([]interface{}); ok { | |
| arr := make([]interface{}, len(nestedArray)) | |
| for i, nested := range nestedArray { | |
| mm := make(map[string]interface{}) | |
| loadMap(mm, nested.(*datastore.Entity).Properties) | |
| arr[i] = mm | |
| } | |
| m[prop.Name] = arr | |
| } else { | |
| m[prop.Name] = prop.Value | |
| } | |
| } | |
| } | |
| func (d *DynamicEntity) Save() ([]datastore.Property, error) { | |
| return nil, nil | |
| } |
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| package main | |
| import ( | |
| "context" | |
| "fmt" | |
| "cloud.google.com/go/datastore" | |
| ) | |
| func main() { | |
| ctx := context.Background() | |
| ds, err := datastore.NewClient(ctx, "my-project-id") | |
| handleErr(err) | |
| myEntityMap := make(DynamicEntity) | |
| err = ds.Get(ctx, datastore.IDKey("MyEntity", 1234, nil), &myEntityMap) | |
| fmt.Printf("myEntityMap: %+v\n", myEntityMap) | |
| myField := myEntityMap["MyField"].(string) | |
| fmt.Println("MyField", myField) | |
| myNestedField := myEntityMap["NestedEntity"].(map[string]interface{})["NestedField"].(string) | |
| fmt.Println("NestedEntity.NestedField", myNestedField) | |
| } | |
| func handleErr(err error) { | |
| if err != nil { | |
| panic(err) | |
| } | |
| } |
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