Unmarshal to array of struct

[shardnit]

Hi,

Given a struct Test, that has marshal and unmarshal interfaces generated, is it possible to unmarshal data to []Test?

I have tried various alternatives like:

var ArrTestType []Test

type ArrTest struct {
    ArrTestType //anonymous embedded field
}

but it doesnt work. In this case, easyjson complains that it expects a struct (for the embedded field).

[docmerlin]

bump

[cheshir]

Also bump. I have the same problem with slice of structures. Soon will be year from creating issue. Seems like this library isn't ready for production usage.

[rvasily]

Its impossible to add methods to slice type Try this type ArrTestType []Test

[cheshir]

Thank you for fast response. First of all I create a custom type for slice of structs:

type ItemList []Item
type Item struct {}

Then I ran easyjson -all path/to/file.go. Lets check generated code. I see generated methods only for Item struct. ItemList type was ignored.

[rvasily]

//easyjson:json
type ItemList []Item

//easyjson:json
type Item struct {
	Val int
}

func TestUnpack() {
	data := []byte(`[{"Val":1}, {"Val":2}]`)
	v := ItemList{}

	v.UnmarshalJSON(data)

	fmt.Println(v)
}

This works fine

[rvasily]

Withouth //easyjson:json dont works, because it's not a struct ( -all match structs ). I'll think what can be done here

[cheshir]

But how about MarshalJSON? I can't marshal struct that doesn't implement easyjson.Marshaler interface. I've tried to add //easyjson:json build tag but this was not help.

[cheshir]

Ooops. My mistake. I've added easyjson tag to package instead of type declaration. After I've added tag before type declaration encoding code had been generated.

I think that this usage hack would be worth to describe in readme. Thank you for help.

[cmiller01]

This thread helped a lot in my implementation. Thanks! Btw, I found easyjson serialization works consistently and quickly under heavy load testing, while encoding/json does not.

[zhangruiskyline]

Withouth //easyjson:json dont works, because it's not a struct ( -all match structs ). I'll think what can be done here

@rvasily Sorry, so what is the correct way to generate the easyjson file? "easyjson -all *.go" dose not work. then which command should we use?

[anuaimi]

zhangruiskyline, I just ran into the same issue. I removed the -all and it worked. Note, you need to tag each struct with //easyjson:json as rvasily indicated.

[zhangruiskyline]

Thanks @anuaimi , how to tag structure with //easyjson:json? do you have a example?

[anuaimi]

this is an example

//easyjson:json
type ItemList []Item

[farkhad]

// easyjson.go
package main

import "fmt"

// easyjson:json
type ItemList []Item

// easyjson:json
type Item struct {
	Val int
}

func TestUnpack() {
	data := []byte(`[{"Val":1}, {"Val":2}]`)
	v := ItemList{}

	v.UnmarshalJSON(data)

	fmt.Println(v)
}

func main() {
	TestUnpack()
}

then I ran easyjson easyjson.go, new file easyjson_easyjson.go was created and yet errors shown Bootstrap failed: 1:24: expected type, found newline

Trying to run go run . and get empty array [] as a result. Why?