Run R-Script from Nodejs and Express

Question

This is my express server structure

--routes
 ----index.js
 ----graph.js
--scripts
 ----test.R
--server.js

I am trying to call R script from graph.js file as below

router.get('/test',function(req,res,next){
    var R = require("r-script");
    var out = R("./scripts/test.R")
              .data()
              .callSync();   
    res.send(out);
});

But I am getting the following error

TypeError: Cannot read property 'data' of undefined.

Any help is greatly appreciated. Thanks

Try R("../scripts/test.R") with an extra .. I think it's calling it relative to the graph.js, not server.js. — zero298
– zero298, Commented May 15, 2018 at 20:11
Looks like there is an issue with the repo itself. Take a look at joshkatz/r-script#19. You may need to install that particular pull request in order to deal with the issue until it is merged. — zero298
– zero298, Commented May 15, 2018 at 20:29

zero298 · Accepted Answer · 2018-05-15 20:17:59Z

1

I believe it is being called relative to graph.js instead of server.js.

Try using R("../scripts/test.R") with an extra ..

answered May 15, 2018 at 20:17

zero298

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Comments

palmtreesnative · Accepted Answer · 2018-10-26 17:18:27Z

0

I'm facing this problem each time I install "r-script" but I found the solution a long time ago just there: https://github.com/joshkatz/r-script/pull/20/commits/1eb0c33628360957f0dd589b92e804fba15891d5.

Just replace return _.bindAll(obj, "data", "call", "callSync"); by:

  _.bindAll(obj, "data", "call", "callSync");
  return obj;

in the file: node_modules/r-script/index.js

Hope I helped you even if you asked more than 5 months ago.

answered Oct 26, 2018 at 17:18

palmtreesnative

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