Adding data to decoded empty table produce no change when encode again about lua-rapidjson

[xpol]

Because the a deocded from str has metatable {__jsontype= 'object'}. This tells lua rapdijson that the table should always tread as json object.

> json = require('rapidjson')
> a = {}
> str = json.encode(a)
> a = json.decode(str)
> t = getmetatable(a)
> t.__jsontype
object
> 

[brynne8]

@xpol So why didn't rapidjson handle this? How can I re-encode it as JSON string? The cjson module handles the case as well, as produced expected output. As in Lua, there's no difference between array and object, both treated as tables.

[brynne8]

I mean, why not simply remove the metatable __jsontype before passing to Lua? It will be more convenient, and will still auto detect it is an object or array.

[xpol]

Modify your code.

local a = {}

to

local a = rapidjson.array()

the a will be always be treated as array.

[brynne8]

But still, this would lose generality, to switch from libraries... Well thanks.

[xpol]

JSON [] is not JSON {}. Did you mean got a JSON empty object decoded into a Lua table and you want later encode it as array? Best Regards! Xpol Wan // There is a better way!

…

On Sun, Aug 25, 2019 at 3:33 PM Alexander Misel ***@***.***> wrote: I mean, why not simply remove the metatable __jsontype before passing to Lua? It will be more convenient, and will still auto detect it is an object or array. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#43?email_source=notifications&email_token=AAAE6GC4HB7URU67ZTMKWPDQGIYUXA5CNFSM4IPIC7JKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5COHCY#issuecomment-524608395>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAE6GASR5MASUXL5F3GRZDQGIYUXANCNFSM4IPIC7JA> .

[brynne8]

Did you mean got a JSON empty object decoded into a Lua table and you want
later encode it as array?

Yes! That's it. If could be so. Maybe it's because I used JSON as a serialization method, and I just want it could be encoded and decoded back and forth, and able to re-encode, if, my Lua table is already changed, as I suggest, from object to array, or vice versa.

[xpol]

setmetatable(a, nil) 发自我的 iPhone

…

在 2019年8月25日，下午3:51，Alexander Misel ***@***.***> 写道： Did you mean got a JSON empty object decoded into a Lua table and you want later encode it as array? Yes! That's it. If could be so. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.