[R] Reading JSON files from R

[Duncan Temple Lang]

Hi m.dr.

  Reading data from MongoDB is no problem. So the RJSONIO or rjson
packages should work.

  Can you send me the sample file that is causing the problem, please?

 The error about a method looks like a potential oversight in the combinations
of inputs.

  Thanks
    D.




On 12/3/12 7:30 PM, m.dr wrote:
> Hello All -
> 
> I am trying to use RJSONIO to read in some JSON files.
> 
> I was wondering if anyone could please comment on the level of complexity of
> the files it can be used to read, exports from or directly from NoSQL DBMS
> like MongoDB and such.
> 
> Also, i understand that in reading the JSON file RJSONIO will automatically
> create the necessary structures. However I cannot seem to use to to read the
> file properly and get this error:
> 
> Error in function (classes, fdef, mtable)  : 
>   unable to find an inherited method for function "fromJSON", for signature
> "missing", "NULL"
> 
> The call I am making is:
> noSqlData <- fromJSON(file='data.json')
> 
> It is a small file - with 3 levels of nested records.
> 
> And if there were some links to some examples with a file and usage would be
> great. My JSON file validates - so do not believe there is anything wrong
> with the file.
> 
> Thanks for your help.
> 
> 
> 
> 
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Reading-JSON-files-from-R-tp4651976.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
>