GoLang Redis : Map & Slice
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I'm using GoLang to get a data from redis hash and then map into a struct.
type Person struct {
ID string `json:"id"`
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
Filters interface{} `json:"filters"`
Type string `json:"type"`
}
In Redis, a hash field contains a stringified JSON.
HGET hashname fieldname
Above returns a stringified JSON.
Now "filters" key can be array or map based on the type (That's why I defined Filters type as interface in struct).
I marshall the JSON like below:
var p Person
content, err := redis.HGet("hashName", "id").Result()
_ = json.Unmarshal(byte(content), &p)
Now I have to loop over filters like below but this is giving error that cannot range over p.Filters (type interface {}) (I understand why this error is coming)
for _, filter := range p.Filters {
fmt.Println(filter)
}
Is there any way we can handle this situation?
Thanks,
Shashank
json go redis
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
add a comment |
I'm using GoLang to get a data from redis hash and then map into a struct.
type Person struct {
ID string `json:"id"`
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
Filters interface{} `json:"filters"`
Type string `json:"type"`
}
In Redis, a hash field contains a stringified JSON.
HGET hashname fieldname
Above returns a stringified JSON.
Now "filters" key can be array or map based on the type (That's why I defined Filters type as interface in struct).
I marshall the JSON like below:
var p Person
content, err := redis.HGet("hashName", "id").Result()
_ = json.Unmarshal(byte(content), &p)
Now I have to loop over filters like below but this is giving error that cannot range over p.Filters (type interface {}) (I understand why this error is coming)
for _, filter := range p.Filters {
fmt.Println(filter)
}
Is there any way we can handle this situation?
Thanks,
Shashank
json go redis
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
1
Are you asking how to convert JSON text to Go values where an element of the JSON can be an array or object? If so, give examples of the two variants of the JSON. Redis seems to be unrelated to the problem.
– Cerise Limón
Nov 16 '18 at 18:02
add a comment |
I'm using GoLang to get a data from redis hash and then map into a struct.
type Person struct {
ID string `json:"id"`
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
Filters interface{} `json:"filters"`
Type string `json:"type"`
}
In Redis, a hash field contains a stringified JSON.
HGET hashname fieldname
Above returns a stringified JSON.
Now "filters" key can be array or map based on the type (That's why I defined Filters type as interface in struct).
I marshall the JSON like below:
var p Person
content, err := redis.HGet("hashName", "id").Result()
_ = json.Unmarshal(byte(content), &p)
Now I have to loop over filters like below but this is giving error that cannot range over p.Filters (type interface {}) (I understand why this error is coming)
for _, filter := range p.Filters {
fmt.Println(filter)
}
Is there any way we can handle this situation?
Thanks,
Shashank
json go redis
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
I'm using GoLang to get a data from redis hash and then map into a struct.
type Person struct {
ID string `json:"id"`
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
Filters interface{} `json:"filters"`
Type string `json:"type"`
}
In Redis, a hash field contains a stringified JSON.
HGET hashname fieldname
Above returns a stringified JSON.
Now "filters" key can be array or map based on the type (That's why I defined Filters type as interface in struct).
I marshall the JSON like below:
var p Person
content, err := redis.HGet("hashName", "id").Result()
_ = json.Unmarshal(byte(content), &p)
Now I have to loop over filters like below but this is giving error that cannot range over p.Filters (type interface {}) (I understand why this error is coming)
for _, filter := range p.Filters {
fmt.Println(filter)
}
Is there any way we can handle this situation?
Thanks,
Shashank
json go redis
json go redis
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
asked Nov 16 '18 at 17:38
Shashank SachanShashank Sachan
8218
8218
1
Are you asking how to convert JSON text to Go values where an element of the JSON can be an array or object? If so, give examples of the two variants of the JSON. Redis seems to be unrelated to the problem.
– Cerise Limón
Nov 16 '18 at 18:02
add a comment |
1
Are you asking how to convert JSON text to Go values where an element of the JSON can be an array or object? If so, give examples of the two variants of the JSON. Redis seems to be unrelated to the problem.
– Cerise Limón
Nov 16 '18 at 18:02
1
1
Are you asking how to convert JSON text to Go values where an element of the JSON can be an array or object? If so, give examples of the two variants of the JSON. Redis seems to be unrelated to the problem.
– Cerise Limón
Nov 16 '18 at 18:02
Are you asking how to convert JSON text to Go values where an element of the JSON can be an array or object? If so, give examples of the two variants of the JSON. Redis seems to be unrelated to the problem.
– Cerise Limón
Nov 16 '18 at 18:02
add a comment |
1 Answer
1
active
oldest
votes
You need to convert Filters type interface{} into the expected slice. If you don't really know what type it will be, you can use map[string]interface{}. Therefore change your Filters type to map[string]interface{}.
Per more information
If Filters can be an array (or not), then you might consider a type switch:
A simple example:
package main
import (
"encoding/json"
"fmt"
)
func main() {
var i interface{}
//json.Unmarshal(byte(`["hi"]`), &i)
json.Unmarshal(byte(`{"a":"hi"}`), &i)
switch i.(type) {
case interface{}:
println("ARRAY")
case map[string]interface{}:
println("NOT ARRAY")
default:
fmt.Printf("%Tn", i)
}
}
answered Nov 16 '18 at 17:44
poypoy
6,59263465
If I use map[string]interface{} then I cannot assign array to Filters. (Filters can be array or map)
– Shashank Sachan
Nov 16 '18 at 17:47
I see. I'll update my answer.
– poy
Nov 16 '18 at 17:52
Thanks! This is going to work for me.
– Shashank Sachan
Nov 16 '18 at 18:58
Awesome! I'm glad I could help.
– poy
Nov 16 '18 at 19:00
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
You need to convert Filters type interface{} into the expected slice. If you don't really know what type it will be, you can use map[string]interface{}. Therefore change your Filters type to map[string]interface{}.
Per more information
If Filters can be an array (or not), then you might consider a type switch:
A simple example:
package main
import (
"encoding/json"
"fmt"
)
func main() {
var i interface{}
//json.Unmarshal(byte(`["hi"]`), &i)
json.Unmarshal(byte(`{"a":"hi"}`), &i)
switch i.(type) {
case interface{}:
println("ARRAY")
case map[string]interface{}:
println("NOT ARRAY")
default:
fmt.Printf("%Tn", i)
}
}
answered Nov 16 '18 at 17:44
poypoy
6,59263465
If I use map[string]interface{} then I cannot assign array to Filters. (Filters can be array or map)
– Shashank Sachan
Nov 16 '18 at 17:47
I see. I'll update my answer.
– poy
Nov 16 '18 at 17:52
Thanks! This is going to work for me.
– Shashank Sachan
Nov 16 '18 at 18:58
Awesome! I'm glad I could help.
– poy
Nov 16 '18 at 19:00
add a comment |
You need to convert Filters type interface{} into the expected slice. If you don't really know what type it will be, you can use map[string]interface{}. Therefore change your Filters type to map[string]interface{}.
Per more information
If Filters can be an array (or not), then you might consider a type switch:
A simple example:
package main
import (
"encoding/json"
"fmt"
)
func main() {
var i interface{}
//json.Unmarshal(byte(`["hi"]`), &i)
json.Unmarshal(byte(`{"a":"hi"}`), &i)
switch i.(type) {
case interface{}:
println("ARRAY")
case map[string]interface{}:
println("NOT ARRAY")
default:
fmt.Printf("%Tn", i)
}
}
answered Nov 16 '18 at 17:44
poypoy
6,59263465
If I use map[string]interface{} then I cannot assign array to Filters. (Filters can be array or map)
– Shashank Sachan
Nov 16 '18 at 17:47
I see. I'll update my answer.
– poy
Nov 16 '18 at 17:52
Thanks! This is going to work for me.
– Shashank Sachan
Nov 16 '18 at 18:58
Awesome! I'm glad I could help.
– poy
Nov 16 '18 at 19:00
add a comment |
You need to convert Filters type interface{} into the expected slice. If you don't really know what type it will be, you can use map[string]interface{}. Therefore change your Filters type to map[string]interface{}.
Per more information
If Filters can be an array (or not), then you might consider a type switch:
A simple example:
package main
import (
"encoding/json"
"fmt"
)
func main() {
var i interface{}
//json.Unmarshal(byte(`["hi"]`), &i)
json.Unmarshal(byte(`{"a":"hi"}`), &i)
switch i.(type) {
case interface{}:
println("ARRAY")
case map[string]interface{}:
println("NOT ARRAY")
default:
fmt.Printf("%Tn", i)
}
}
answered Nov 16 '18 at 17:44
poypoy
6,59263465
You need to convert Filters type interface{} into the expected slice. If you don't really know what type it will be, you can use map[string]interface{}. Therefore change your Filters type to map[string]interface{}.
Per more information
If Filters can be an array (or not), then you might consider a type switch:
A simple example:
package main
import (
"encoding/json"
"fmt"
)
func main() {
var i interface{}
//json.Unmarshal(byte(`["hi"]`), &i)
json.Unmarshal(byte(`{"a":"hi"}`), &i)
switch i.(type) {
case interface{}:
println("ARRAY")
case map[string]interface{}:
println("NOT ARRAY")
default:
fmt.Printf("%Tn", i)
}
}
answered Nov 16 '18 at 17:44
poypoy
6,59263465
edited Nov 16 '18 at 17:52
answered Nov 16 '18 at 17:44
poypoy
6,59263465
answered Nov 16 '18 at 17:44
poypoy
6,59263465
answered Nov 16 '18 at 17:44
poypoy
6,59263465
6,59263465
If I use map[string]interface{} then I cannot assign array to Filters. (Filters can be array or map)
– Shashank Sachan
Nov 16 '18 at 17:47
I see. I'll update my answer.
– poy
Nov 16 '18 at 17:52
Thanks! This is going to work for me.
– Shashank Sachan
Nov 16 '18 at 18:58
Awesome! I'm glad I could help.
– poy
Nov 16 '18 at 19:00
add a comment |
If I use map[string]interface{} then I cannot assign array to Filters. (Filters can be array or map)
– Shashank Sachan
Nov 16 '18 at 17:47
I see. I'll update my answer.
– poy
Nov 16 '18 at 17:52
Thanks! This is going to work for me.
– Shashank Sachan
Nov 16 '18 at 18:58
Awesome! I'm glad I could help.
– poy
Nov 16 '18 at 19:00
If I use map[string]interface{} then I cannot assign array to Filters. (Filters can be array or map)
– Shashank Sachan
Nov 16 '18 at 17:47
If I use map[string]interface{} then I cannot assign array to Filters. (Filters can be array or map)
– Shashank Sachan
Nov 16 '18 at 17:47
I see. I'll update my answer.
– poy
Nov 16 '18 at 17:52
I see. I'll update my answer.
– poy
Nov 16 '18 at 17:52
Thanks! This is going to work for me.
– Shashank Sachan
Nov 16 '18 at 18:58
Thanks! This is going to work for me.
– Shashank Sachan
Nov 16 '18 at 18:58
Awesome! I'm glad I could help.
– poy
Nov 16 '18 at 19:00
Awesome! I'm glad I could help.
– poy
Nov 16 '18 at 19:00
add a comment |
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1
Are you asking how to convert JSON text to Go values where an element of the JSON can be an array or object? If so, give examples of the two variants of the JSON. Redis seems to be unrelated to the problem.
– Cerise Limón
Nov 16 '18 at 18:02