Able to encode but decode crash on simple record.

[edwardt]

All the fields are encodes as binary string.

-------------------------chat_message.hrl-----------------------------------------------

-ifndef(CHAT_MESSAGE_HRL).
-define(CHAT_MESSAGE_HRL, true).
-record(chat_message, {
from ::binary(),
to ::binary(),
brandId ::binary(),
type ::binary(),
format ::binary(),
subject ::binary(),
body ::binary(),
thread ::binary(),
time_stamp ::binary()}).
-export_records([chat_message]).

-endif.

-module(chat_message_model).
-include_lib("jsonrec.hrl").
-include_lib("chat_message.hrl").

-export([encode/1, decode/1]).

encode(#chat_message{} = Rec) ->
?encode_gen(#chat_message{}, Rec).

decode(Payload) ->
?decode_gen(#chat_message{}, Payload).

Code to encode and decode:
Payload0 = chat_message_model:encode(Payload),
chat_message_model:decode(Payload0),

After encode, here is the data:
[<<"{">>,[""from"",<<":">>,[34,<<"270297119">>,34],<<",">>,""to"",<<":">>,[34,<<"116688729">>,34],<<",">>,""brandId"",<<":">>,[34,<<"1003">>,34],<<",">>,""type"",<<":">>,[34,<<"chat">>,34],<<",">>,""format"",<<":">>,[34,<<"chat">>,34],<<",">>,""subject"",<<":">>,[34,<<"1386199916344270297119116688729116688729270297119">>,34],<<",">>,""body"",<<":">>,[34,[<<"Consumer Service Test Msg-12">>,<<"/">>,<<" 6">>,<<"/">>,<<"0043 19:49:28 From Server: spark_rabbit_consumer@192.168.4.124">>],34],<<",">>,""thread"",<<":">>,[34,<<"1386199916344270297119116688729">>,34],<<",">>,""time_stamp"",<<":">>,[34,[<<"12">>,<<"/">>,<<" 6">>,<<"/">>,<<"0043 19:49:28">>],34]],<<"}">>]

Then decode says:
{error,{expected,<<"{">>,at,[<<"{">>,[""from"",<<":">>,[34,<<"270297119">>,34],<<",">>,""to"",<<":">>,[34,<<"116688729">>,34],<<",">>,""brandId"",<<":">>,[34,<<"1003">>,34],<<",">>,""type"",<<":">>,[34,<<"chat">>,34],<<",">>,""format"",<<":">>,[34,<<"chat">>,34],<<",">>,""subject"",<<":">>,[34,<<"1386199916344270297119116688729116688729270297119">>,34],<<",">>,""body"",<<":">>,[34,[<<"Consumer Service Test Msg-12">>,<<"/">>,<<" 6">>,<<"/">>,<<"0043 19:49:28 From Server: spark_rabbit_consumer@192.168.4.124">>],34],<<",">>,""thread"",<<":">>,[34,<<"1386199916344270297119116688729">>,34],<<",">>,""time_stamp"",<<":">>,[34,[<<"12">>,<<"/">>,<<" 6">>,<<"/">>,<<"0043 19:49:28">>],34]],<<"}">>]}}

[EduardSergeev]

I agree, the error is cryptic, but the actual problem is that encode/1 returns iolist() while decode/1 expects binary(). To make your example work just convert the result of encode to binary() using erlang:iolist_to_binary/1 (or even erlang:list_to_binary/1) before passing to to decode/1:

Payload0 = chat_message_model:encode(Payload),
chat_message_model:decode(list_to_binary(Payload0)).

[edwardt]

thanks. Just a note, would you mind highlight the hint in the error that can help me identify this? I would like to know where to look next time, so not to repeat the same mistake before going into the library source code.