####Making erlang record <~> json conversion easy.
Detailed info at exprecs, making json usable
Quick example:
-module(book).
-export([new/1]).
-record(book, {
style :: atom(),
count :: integer(),
available :: boolean(),
pages :: integer(),
excerpt :: string(),
author :: string()
}).
%% the exprecs export of the record interface
-compile({parse_transform, exprecs}).
-export_records([book]).
%% here we provide a mapping of the json key to a record.
new(<<"book">>) ->
'#new-book'();
%% if the key is unknown, return undefined.
new(_RecName) ->
undefined.
At this point we can take the following json and transform it into the #book{} record.
{
"style": "fiction",
"count": 1,
"available": true,
"pages": 42,
"excerpt": "Good bye and thanks for all the fish.",
"author":"Adams, Douglas"
}
We can get a #book{} record from the above with
-spec json_to_rec(Json :: string()) -> #book{}.
json_to_rec(Json) ->
ErlJson = mochijson2:decode(Json),
Record = book:new(<<"book">>),
json_rec:to_rec(ErlJson, book, Record).