CODEWITHSUNDEEP
react-nativemobilerealmlocal-storagerealm-mobile-platform
buddhiv
buddhiv

Reputation: 708

Realm error - _constructor must be of type 'function', got (undefined)

I am trying to setup Realm DB locally with my react native application but there seems to be an error that I cannot figure out a reason for. I have followed the documentation and the guide here.

My Code.

import Realm from 'realm';

export const ConfigSchema = {
    name: 'Config',
    primaryKey: 'key',
    properties: {
        key: 'string',
        value: 'string'
    }
};

export const databaseOptions = {
    path: 'myappreactnative.realm',
    schema: [ConfigSchema],
    schemaVersion: 0
};

export const insertNewConfig = (newConfig) => new Promise((resolve, reject) => {
    Realm.open(databaseOptions).then(realm => {
        // realm.create('Config', newConfig);
        // resolve(newConfig);
        console.log(realm);
    }).catch((error) => reject(error))
});

I'm calling insertNewConfig from here,

let config = {
    key: 'instanceUrl',
    value: 'myurl.domain.value'
};

insertNewConfig(config).then((result) => {
    console.log(result);
}).catch((error) => {
    console.log(error);
});

this.props.navigation.navigate('Login', {});

The error is there at the Realm.open(databaseOptions) line. First I though the error was with realm.create but later realized the original line.

The error showing is like this.

Error: _constructor must be of type 'function', got (undefined)
    at sendRequest (rpc.js:263)
    at Object.createRealm (rpc.js:62)
    at new Realm (index.js:102)
    at Function.open (extensions.js:110)
    at eval (eval at <anonymous> (MetroClient.js:63), <anonymous>:29:22)
    at tryCallTwo (core.js:45)
    at doResolve (core.js:200)
    at new Promise (core.js:66)
    at insertNewConfig (eval at <anonymous> (MetroClient.js:63), <anonymous>:28:12)
    at Object.SelectInstanceScreen._this.continueLogin [as onPress] (eval at <anonymous> (MetroClient.js:63), <anonymous>:74:37)

Seems that the open() function must be called as a function (_constructor must be of type 'function') but it is obvious that open() is called as a function. Thanks in advance.

Upvotes: 8

Views: 1407

Answers (4)

Shah Nawaz
Shah Nawaz

Reputation: 36

There are a few issues related to Node update and realm. Realm doesn't work with Node 10 and for your issue downgrading to 2.16 will resolve the issue.

Upvotes: 1

Bhagwat K
Bhagwat K

Reputation: 3142

I have changed package.json changed

from "realm": "ˆ2.16.0",

to "realm": "2.16.0",

And then execute npm install or yarn

Solved it for me.

Upvotes: 1

Mustafa Buyukcelebi
Mustafa Buyukcelebi

Reputation: 162

It is related from last version of realm(v2.18.0). You should downgrade to 2.16.0.

After that, you can run this code for reset all packages;

watchman watch-del-all && rm -rf $TMPDIR/react-native-packager-cache-* && rm -rf $TMPDIR/metro-bundler-cache-* && rm -rf node_modules/ && yarn cache clean && yarn install && yarn start -- --reset-cache

Upvotes: 1

C-lio Garcia
C-lio Garcia

Reputation: 710

I think maybe is a bug on last release (2.18.0), try to downgrade to 2.16.0 it will works.

Upvotes: 6

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