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Using Realm from npm on Electron JS app

I am trying to use Realm imported with NPM but it fails.

I am using the Realm example for JavaScript:

const Realm = require('realm');

// Define your models and their properties
const CarSchema =
name: 'Car',
properties:
make: 'string',
model: 'string',
miles: type: 'int', default: 0,

;
const PersonSchema =
name: 'Person',
properties:
name: 'string',
birthday: 'date',
cars: 'Car',
picture: 'data?' // optional property

;

Realm.open(schema: [CarSchema, PersonSchema])
.then(realm =>
// Create Realm objects and write to local storage
realm.write(() =>
const myCar = realm.create('Car',
make: 'Honda',
model: 'Civic',
miles: 1000,
);
myCar.miles += 20; // Update a property value
);

// Query Realm for all cars with a high mileage
const cars = realm.objects('Car').filtered('miles > 1000');

// Will return a Results object with our 1 car
cars.length // => 1

// Add another car
realm.write(() =>
const myCar = realm.create('Car',
make: 'Ford',
model: 'Focus',
miles: 2000,
);
);

// Query results are updated in realtime
cars.length // => 2
)
.catch(error =>
console.log(error);
);


And this is the error it throws:

Uncaught Error: Cannot find module
'[path]/node_modules/realm/compiled/electron-v2.0_darwin_x64/realm.node'
at Module._resolveFilename (module.js:543:15)
at Function.Module._resolveFilename ([path]/node_modules/electron/dist/Electron.app/Contents/Resources/electron.asar/common/reset-search-paths.js:35:12)
at Function.Module._load (module.js:473:25)
at Module.require (module.js:586:17)
at require (internal/module.js:11:18)
at Object. ([path]/node_modules/realm/lib/index.js:102:28)
at Object. ([path]/node_modules/realm/lib/index.js:133:3)
at Module._compile (module.js:642:30)
at Object.Module._extensions..js (module.js:653:10)
at Module.load (module.js:561:32)

Thank you so much for help.

1 Answer
1

Welcome to SO!

What happens is that electron specifies its own environment, while realm runtime loads its binaries based on this currently running environment.

However, when installing realm with npm, we fetch the binaries corresponding to the environment at the time of install, i.e. our node engine.

Therefore when running electron in dev mode, realm does not find the binary corresponding to the electron environment.

The usual workaround is to use the electron-builder package and run its install-app-deps command, which will install the appropriate binaries for the electron target environment.

install-app-deps

It is usually recommended to make it an automatic script in your package.json file:

package.json

To ensure your native dependencies are always matched electron version, simply add script :

"scripts":
"postinstall": "electron-builder install-app-deps"



…so that it get run whenever you install a new package.

realm

electron-builder install-app-deps

npm start

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