FYI Return values of public facing functions

[ff6347]

In the function simple I constructed a JSON response using lists. See

fhpredict/R/simple.R

Line 21 in 942d467

jsonlite::toJSON(res, auto_unbox = TRUE)

By reading the docs I found out that we actually don't need this. we just can add the suffix json as in http://localhost:8004/ocpu/library/fhpredict/R/simple/json and we will get some JSON output from it. 🚀
We still should take a look that these return values have a common format. So we don't have on one endpoint {foo:bah} and on the other [1,2,3] https://www.opencpu.org/api.html#api-formats

I guess a function that wrapps return values would be good as the postgres-api does with the fields:

{
"success": true,
"data":[],
"version": "0.1.0",
"message": "wooohooo it worked"
}

So we should:

• always return an data array of objects. Even if it is a "single object function"
• always return the package version
• always return an info of the computation was correct
• if there is a message to tell return it as a string