Populating an array of structs passed to a function as a pointer
0
I'm want to do data pagination with Google Cloud Platform Datastore and I've found an example on GCP's page (https://cloud.google.com/datastore/docs/concepts/queries) for doing it with Cursors and it works absolutely fine.
The example provided by Google has hardcoded the variables var tasks Task and var task Task and I would like to create a reusable function where I can pass the pointer to a struct array via a parameter typed interface{} and get this struct populated by this function. For example:
type MyStruct1 struct {
F1 string
}
type MyStruct2 struct {
F1 int
}
func list(ctx context.Context, cursorStr string, data interface{}) {
...
}
func main() {
mystruct1 := make(MyStruct1, 0)
list(ctx, "", &mystruct1)
mystruct2 := make(MyStruct2, 0)
list(ctx, "", &mystruct2)
}
My problem starts when I need to create in this function, a variable to store the record and then append it to the struct array passed as a pointer.
Example from Google
func SnippetIterator_Cursor() {
ctx := context.Background()
client, _ := datastore.NewClient(ctx, "my-proj")
cursorStr := ""
// [START datastore_cursor_paging]
const pageSize = 5
query := datastore.NewQuery("Tasks").Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Read the tasks.
var tasks Task << THIS IS WHAT I WANT TO BE GENERIC
var task Task. << THIS IS WHAT I WANT TO BE GENERIC
it := client.Run(ctx, query)
_, err := it.Next(&task)
for err == nil {
tasks = append(tasks, task)
_, err = it.Next(&task)
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
My Generic function based on the code above
func list(ctx context.Context, kind string, data interface{}, pageSize int, cursorStr string) string {
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
it := query.Run(ctx)
// HERE IS WHERE THE PROBLEM STARTS
var vet interface{}
var rec interface{}
k, err := it.Next(rec)
if err != nil {
log.Println(err.Error())
}
for err == nil {
log.Println(k, rec) // PROBLEM: The key comes ok but rec comes nil
vet = append(vet, rec)
k, err = it.Next(rec)
}
log.Println(vet) // PROBLEM: vet has only nils
nextCursor, err := it.Cursor()
if err != nil {
log.Println(err.Error())
}
data = vet
return nextCursor.String()
}
func TestListFunc() {
data := make(Tasks, 0)
cursor := list(ctx, "Tasks", &data, 10, "")
x, _ := json.MarshalIndent(data, " ", " ")
log.Println(string(x))
}
PROBLEM: The Datastore iterator .Next() doesn't seem to store the record in a variable typed interface{}
go 
google-cloud-platform 
google-cloud-datastore asked Nov 12 '18 at 0:48
TTKDroid
1538
add a comment |
0
I'm want to do data pagination with Google Cloud Platform Datastore and I've found an example on GCP's page (https://cloud.google.com/datastore/docs/concepts/queries) for doing it with Cursors and it works absolutely fine.
The example provided by Google has hardcoded the variables var tasks Task and var task Task and I would like to create a reusable function where I can pass the pointer to a struct array via a parameter typed interface{} and get this struct populated by this function. For example:
type MyStruct1 struct {
F1 string
}
type MyStruct2 struct {
F1 int
}
func list(ctx context.Context, cursorStr string, data interface{}) {
...
}
func main() {
mystruct1 := make(MyStruct1, 0)
list(ctx, "", &mystruct1)
mystruct2 := make(MyStruct2, 0)
list(ctx, "", &mystruct2)
}
My problem starts when I need to create in this function, a variable to store the record and then append it to the struct array passed as a pointer.
Example from Google
func SnippetIterator_Cursor() {
ctx := context.Background()
client, _ := datastore.NewClient(ctx, "my-proj")
cursorStr := ""
// [START datastore_cursor_paging]
const pageSize = 5
query := datastore.NewQuery("Tasks").Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Read the tasks.
var tasks Task << THIS IS WHAT I WANT TO BE GENERIC
var task Task. << THIS IS WHAT I WANT TO BE GENERIC
it := client.Run(ctx, query)
_, err := it.Next(&task)
for err == nil {
tasks = append(tasks, task)
_, err = it.Next(&task)
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
My Generic function based on the code above
func list(ctx context.Context, kind string, data interface{}, pageSize int, cursorStr string) string {
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
it := query.Run(ctx)
// HERE IS WHERE THE PROBLEM STARTS
var vet interface{}
var rec interface{}
k, err := it.Next(rec)
if err != nil {
log.Println(err.Error())
}
for err == nil {
log.Println(k, rec) // PROBLEM: The key comes ok but rec comes nil
vet = append(vet, rec)
k, err = it.Next(rec)
}
log.Println(vet) // PROBLEM: vet has only nils
nextCursor, err := it.Cursor()
if err != nil {
log.Println(err.Error())
}
data = vet
return nextCursor.String()
}
func TestListFunc() {
data := make(Tasks, 0)
cursor := list(ctx, "Tasks", &data, 10, "")
x, _ := json.MarshalIndent(data, " ", " ")
log.Println(string(x))
}
PROBLEM: The Datastore iterator .Next() doesn't seem to store the record in a variable typed interface{}
go google-cloud-platform google-cloud-datastore asked Nov 12 '18 at 0:48
TTKDroid
1538
add a comment |
0
0
0
I'm want to do data pagination with Google Cloud Platform Datastore and I've found an example on GCP's page (https://cloud.google.com/datastore/docs/concepts/queries) for doing it with Cursors and it works absolutely fine.
The example provided by Google has hardcoded the variables var tasks Task and var task Task and I would like to create a reusable function where I can pass the pointer to a struct array via a parameter typed interface{} and get this struct populated by this function. For example:
type MyStruct1 struct {
F1 string
}
type MyStruct2 struct {
F1 int
}
func list(ctx context.Context, cursorStr string, data interface{}) {
...
}
func main() {
mystruct1 := make(MyStruct1, 0)
list(ctx, "", &mystruct1)
mystruct2 := make(MyStruct2, 0)
list(ctx, "", &mystruct2)
}
My problem starts when I need to create in this function, a variable to store the record and then append it to the struct array passed as a pointer.
Example from Google
func SnippetIterator_Cursor() {
ctx := context.Background()
client, _ := datastore.NewClient(ctx, "my-proj")
cursorStr := ""
// [START datastore_cursor_paging]
const pageSize = 5
query := datastore.NewQuery("Tasks").Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Read the tasks.
var tasks Task << THIS IS WHAT I WANT TO BE GENERIC
var task Task. << THIS IS WHAT I WANT TO BE GENERIC
it := client.Run(ctx, query)
_, err := it.Next(&task)
for err == nil {
tasks = append(tasks, task)
_, err = it.Next(&task)
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
My Generic function based on the code above
func list(ctx context.Context, kind string, data interface{}, pageSize int, cursorStr string) string {
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
it := query.Run(ctx)
// HERE IS WHERE THE PROBLEM STARTS
var vet interface{}
var rec interface{}
k, err := it.Next(rec)
if err != nil {
log.Println(err.Error())
}
for err == nil {
log.Println(k, rec) // PROBLEM: The key comes ok but rec comes nil
vet = append(vet, rec)
k, err = it.Next(rec)
}
log.Println(vet) // PROBLEM: vet has only nils
nextCursor, err := it.Cursor()
if err != nil {
log.Println(err.Error())
}
data = vet
return nextCursor.String()
}
func TestListFunc() {
data := make(Tasks, 0)
cursor := list(ctx, "Tasks", &data, 10, "")
x, _ := json.MarshalIndent(data, " ", " ")
log.Println(string(x))
}
PROBLEM: The Datastore iterator .Next() doesn't seem to store the record in a variable typed interface{}
go google-cloud-platform google-cloud-datastore asked Nov 12 '18 at 0:48
TTKDroid
1538
I'm want to do data pagination with Google Cloud Platform Datastore and I've found an example on GCP's page (https://cloud.google.com/datastore/docs/concepts/queries) for doing it with Cursors and it works absolutely fine.
The example provided by Google has hardcoded the variables var tasks Task and var task Task and I would like to create a reusable function where I can pass the pointer to a struct array via a parameter typed interface{} and get this struct populated by this function. For example:
type MyStruct1 struct {
F1 string
}
type MyStruct2 struct {
F1 int
}
func list(ctx context.Context, cursorStr string, data interface{}) {
...
}
func main() {
mystruct1 := make(MyStruct1, 0)
list(ctx, "", &mystruct1)
mystruct2 := make(MyStruct2, 0)
list(ctx, "", &mystruct2)
}
My problem starts when I need to create in this function, a variable to store the record and then append it to the struct array passed as a pointer.
Example from Google
func SnippetIterator_Cursor() {
ctx := context.Background()
client, _ := datastore.NewClient(ctx, "my-proj")
cursorStr := ""
// [START datastore_cursor_paging]
const pageSize = 5
query := datastore.NewQuery("Tasks").Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Read the tasks.
var tasks Task << THIS IS WHAT I WANT TO BE GENERIC
var task Task. << THIS IS WHAT I WANT TO BE GENERIC
it := client.Run(ctx, query)
_, err := it.Next(&task)
for err == nil {
tasks = append(tasks, task)
_, err = it.Next(&task)
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
My Generic function based on the code above
func list(ctx context.Context, kind string, data interface{}, pageSize int, cursorStr string) string {
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
it := query.Run(ctx)
// HERE IS WHERE THE PROBLEM STARTS
var vet interface{}
var rec interface{}
k, err := it.Next(rec)
if err != nil {
log.Println(err.Error())
}
for err == nil {
log.Println(k, rec) // PROBLEM: The key comes ok but rec comes nil
vet = append(vet, rec)
k, err = it.Next(rec)
}
log.Println(vet) // PROBLEM: vet has only nils
nextCursor, err := it.Cursor()
if err != nil {
log.Println(err.Error())
}
data = vet
return nextCursor.String()
}
func TestListFunc() {
data := make(Tasks, 0)
cursor := list(ctx, "Tasks", &data, 10, "")
x, _ := json.MarshalIndent(data, " ", " ")
log.Println(string(x))
}
PROBLEM: The Datastore iterator .Next() doesn't seem to store the record in a variable typed interface{}
go google-cloud-platform google-cloud-datastore go google-cloud-platform google-cloud-datastore asked Nov 12 '18 at 0:48
TTKDroid
1538
asked Nov 12 '18 at 0:48
TTKDroid
1538
asked Nov 12 '18 at 0:48
TTKDroid
1538
asked Nov 12 '18 at 0:48
TTKDroid
1538
asked Nov 12 '18 at 0:48
TTKDroid
1538
1538
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
Use the reflect package:
func list(ctx context.Context, kind string, dst interface{}, pageSize int, cursorStr string) string {
client, _ := datastore.NewClient(ctx, "my-proj")
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Get reflect value for the result slice.
results := reflect.ValueOf(dst).Elem()
// Allocate new value of the slice element type.
// resultp is pointer to that value.
resultp := reflect.New(results.Type().Elem())
it := client.Run(ctx, query)
_, err := it.Next(resultp.Interface())
for err == nil {
// Append last value to results
results.Set(reflect.Append(results, resultp.Elem())
_, err = it.Next(resultp.Interface())
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
Call the function with a pointer to the destination slice:
var data Tasks
cursor := list(ctx, "Tasks", &data, 10, "")
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
It works @ThunderCat! You're the GURU of reflection mate! Well done! Thank you very much!
– TTKDroid
Nov 12 '18 at 4:30
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
Use the reflect package:
func list(ctx context.Context, kind string, dst interface{}, pageSize int, cursorStr string) string {
client, _ := datastore.NewClient(ctx, "my-proj")
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Get reflect value for the result slice.
results := reflect.ValueOf(dst).Elem()
// Allocate new value of the slice element type.
// resultp is pointer to that value.
resultp := reflect.New(results.Type().Elem())
it := client.Run(ctx, query)
_, err := it.Next(resultp.Interface())
for err == nil {
// Append last value to results
results.Set(reflect.Append(results, resultp.Elem())
_, err = it.Next(resultp.Interface())
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
Call the function with a pointer to the destination slice:
var data Tasks
cursor := list(ctx, "Tasks", &data, 10, "")
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
It works @ThunderCat! You're the GURU of reflection mate! Well done! Thank you very much!
– TTKDroid
Nov 12 '18 at 4:30
add a comment |
1
Use the reflect package:
func list(ctx context.Context, kind string, dst interface{}, pageSize int, cursorStr string) string {
client, _ := datastore.NewClient(ctx, "my-proj")
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Get reflect value for the result slice.
results := reflect.ValueOf(dst).Elem()
// Allocate new value of the slice element type.
// resultp is pointer to that value.
resultp := reflect.New(results.Type().Elem())
it := client.Run(ctx, query)
_, err := it.Next(resultp.Interface())
for err == nil {
// Append last value to results
results.Set(reflect.Append(results, resultp.Elem())
_, err = it.Next(resultp.Interface())
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
Call the function with a pointer to the destination slice:
var data Tasks
cursor := list(ctx, "Tasks", &data, 10, "")
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
It works @ThunderCat! You're the GURU of reflection mate! Well done! Thank you very much!
– TTKDroid
Nov 12 '18 at 4:30
add a comment |
1
1
1
Use the reflect package:
func list(ctx context.Context, kind string, dst interface{}, pageSize int, cursorStr string) string {
client, _ := datastore.NewClient(ctx, "my-proj")
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Get reflect value for the result slice.
results := reflect.ValueOf(dst).Elem()
// Allocate new value of the slice element type.
// resultp is pointer to that value.
resultp := reflect.New(results.Type().Elem())
it := client.Run(ctx, query)
_, err := it.Next(resultp.Interface())
for err == nil {
// Append last value to results
results.Set(reflect.Append(results, resultp.Elem())
_, err = it.Next(resultp.Interface())
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
Call the function with a pointer to the destination slice:
var data Tasks
cursor := list(ctx, "Tasks", &data, 10, "")
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
Use the reflect package:
func list(ctx context.Context, kind string, dst interface{}, pageSize int, cursorStr string) string {
client, _ := datastore.NewClient(ctx, "my-proj")
query := datastore.NewQuery(kind).Limit(pageSize)
if cursorStr != "" {
cursor, err := datastore.DecodeCursor(cursorStr)
if err != nil {
log.Fatalf("Bad cursor %q: %v", cursorStr, err)
}
query = query.Start(cursor)
}
// Get reflect value for the result slice.
results := reflect.ValueOf(dst).Elem()
// Allocate new value of the slice element type.
// resultp is pointer to that value.
resultp := reflect.New(results.Type().Elem())
it := client.Run(ctx, query)
_, err := it.Next(resultp.Interface())
for err == nil {
// Append last value to results
results.Set(reflect.Append(results, resultp.Elem())
_, err = it.Next(resultp.Interface())
}
if err != iterator.Done {
log.Fatalf("Failed fetching results: %v", err)
}
// Get the cursor for the next page of results.
nextCursor, err := it.Cursor()
// [END datastore_cursor_paging]
_ = err // Check the error.
_ = nextCursor // Use nextCursor.String as the next page's token.
}
Call the function with a pointer to the destination slice:
var data Tasks
cursor := list(ctx, "Tasks", &data, 10, "")
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
edited Nov 12 '18 at 1:16
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
answered Nov 12 '18 at 1:10
ThunderCat
49.6k46177
49.6k46177
It works @ThunderCat! You're the GURU of reflection mate! Well done! Thank you very much!
– TTKDroid
Nov 12 '18 at 4:30
add a comment |
It works @ThunderCat! You're the GURU of reflection mate! Well done! Thank you very much!
– TTKDroid
Nov 12 '18 at 4:30
It works @ThunderCat! You're the GURU of reflection mate! Well done! Thank you very much!
– TTKDroid
Nov 12 '18 at 4:30
It works @ThunderCat! You're the GURU of reflection mate! Well done! Thank you very much!
– TTKDroid
Nov 12 '18 at 4:30
add a comment |
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});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
