Using the golang firestore 1.8 library, I tried to use the new count() function of firestore launched by Google last fall. The docs don't seem to have examples yet, not that I found, but I cobbled together some somewhat working code that pretty much got me doing everything except actually generating an integer. The "result[usercountalias]" value at the bottom of the snippet is the value I'm interested in converting to an integer, but I'm not quite sure how. Of course, I could make it a string, split on the colon, and then parse it, but that would look ugly.
Any tips would be greatly appreciated!
Thank you so much.
func (s UserService) Count(labID string) (int64, error) { if s.DB == nil { return -1, customerrors.ErrDatabaseMissing } query := s.DB. Collection(CollectionUsers). Where("lab_id", "==", labID) userCountAlias := "userCount" ag := query.NewAggregationQuery() //result is a firestore.AggregationResult, which seems to consist of just a //map[string]interface{} result, err := ag.WithCount(userCountAlias).Get(s.Ctx) if err != nil { return -1, err } v := result[userCountAlias]//How do I cast this to an integer? fmt.Printf("Type = %v", v) //Prints "Type = integer_value:379" return -1, nil }
Correct answer
Tryfmt.printf("type = %t", v)
Find outv
type.
v
Most likely firestorepb.value. Note that this is not available in 1.8 yet. Try upgrading cloud.google.com/go/firestore
to the latest version (currently 1.9).
package main import ( "fmt" "cloud.google.com/go/firestore/apiv1/firestorepb" ) func main() { var v interface{} = &firestorepb.Value{ ValueType: &firestorepb.Value_IntegerValue{ IntegerValue: 379, }, } fmt.Printf("%T\n", v) // *firestorepb.Value fmt.Printf("%v\n", v) // integer_value:379 if v, ok := v.(*firestorepb.Value); ok { fmt.Printf("%v\n", v.GetIntegerValue()) // 379 } }
Tests in the official repository retrieve values in the same way. See testintegration_countaggregationquery.
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