error when executing low.mixin

[balasivagnanam]

var low = require('lowdb');
var _contrib = require('underscore-contrib') // For getPath()
var _db = require('underscore.db')

low.mixin(_contrib);
low.mixin(_db);

I saw your example to insert json with inner nodes of the other json. but I get this error when I execute the same code.
Not sure what is missing here.

Thanks,

[typicode]

Hi @balasivagnanam,

The API has changed, mixin should be called this way now:

low._.mixin(_contrib);

[balasivagnanam]

both with and without underscore defined..
its still showing error

var low = require('lowdb');
var _ = require('underscore');
var _contrib = require('underscore-contrib') // For getPath()
var _db = require('underscore.db')

low._.mixin(_contrib);
low._.mixin(_db);

[typicode]

My bad sorry, here is the correct version:

var low = require('lowdb')
var _contrib = require('underscore-contrib')

var db = low('db.json')

db._.mixin(_contrib)

[balasivagnanam]

is this _ here is underscore definition or its with lowdb...

[balasivagnanam]

doesn't work that way as well :(

var low = require('lowdb');
var _ = require('underscore');
var _contrib = require('underscore-contrib') // For getPath()
var _db = require('underscore.db')
//low._.mixin(_contrib);
//low._.mixin(_db);


 app.get('/', function(req, res) {
   res.sendFile('portal/standards.html' , { root : __dirname});
 });

app.use(express.static('./portal/'));
// Optional any deep link calls should return index.html
app.use('/*', express.static('standards.html'));

app.get('/getCompliance/:filename', function(req, res) {

  console.log("compliance api called");
   console.log(req.params.filename);

   var AdmZip = require('adm-zip');
   var logpath;

   var dbinstance = low('db.json');
   dbinstance._.mixin(require('underscore-contrib'))
   dbinstance._.mixin(require('underscore.db'))

[typicode]

Weird, there's a test for mixin here:
https://github.com/typicode/lowdb/blob/v0.10.2/test/index.js#L187

I'll take more time to test later. You're on 0.10.2 right?

[balasivagnanam]

yes 0.10.2 , even I saw the test when I tried to find the way to implement it. but not sure why it is not working...

here is a gist https://gist.github.com/balasivagnanam/ec1f606f0cbdc0040608

[typicode]

Based on your screenshot, it seems like the error comes from line 45. Based on your gist (if it's the same file), it's this line:

var page = dbinstance('results').insert(pagelevel).value(); // Error

You can actually remove .value().
It's only needed if theres a chain() before.

[balasivagnanam]

I am passing dbinstance and page to another module which is doing insert as a subset inside this..

dbinstance('results').get(page.id).getPath('components').insert({component :'header',
                                                    condition : "Standard MOM Header should be present",
                                                    result : "Fail" ,
                                                    remarks: "Missing Standard Header"
                                                  });

you can check the same gist..

[balasivagnanam]

and the error is at getPath

TypeError: undefined is not a function
at Object.module.exports.getCheckHeader (C:\mytests\momtest\standard-components.js:51:46)
at Object.module.exports.getComponentCheckResults (C:\mytests\momtest\checkermain.js:136:28)
at C:\mytests\momtest\server.js:67:43
at Array.forEach (native)
at C:\mytests\momtest\server.js:53:16
at Layer.handle as handle_request
at next (C:\mytests\momtest\node_modules\express\lib\router\route.js:131:13)
at Route.dispatch (C:\mytests\momtest\node_modules\express\lib\router\route.js:112:3)
at Layer.handle as handle_request
at C:\mytests\momtest\node_modules\express\lib\router\index.js:277:22

[typicode]

It's actually because you're chaining lodash and other methods without chain(). The following code shouldn't throw an error:

dbinstance('results')
  .chain()
  .getById(page.id) // I think you want to get by id here
  .getPath('components')
  .insert({component :'header',
    condition : "Standard MOM Header should be present",
    result : "Fail" ,
    remarks: "Missing Standard Header"
  })
  .value()

[balasivagnanam]

there is no error after doing chain(), but with get(page.id) there is no insert at inside level happening, when I change to getById I start to get undefined is not a function at this location.

updated gist

[balasivagnanam]

woww... it works :)

{
  "results": [
    {
      "name": "page-name",
      "description": "paris",
      "components": [
        {
          "component": "header",
          "condition": "Standard MOM Header should have only the defined elements",
          "result": "Fail",
          "remarks": "Standard MOM Header has more elements than the standard",
          "id": "7eb0b3d9-0d6c-49be-a288-f1981ca4718d"
        }
      ],
      "id": "a88bb8f2-de12-4cd9-8d26-5ccced79ccc3"
    }
  ]
}

[balasivagnanam]

thanks a lot :) your help is highly appreciated :)

[typicode]

You're welcome :)