How to read data from realm DB in react native? - react-native

Question

I followed a realm db tutorial in react native and I succeed to create, insert, delete data from DB but I have problem reading from database.
I always get same result which is not resolved and useless.
I checked my codes a lot But I cant find out my mistake.
Here is my code:
database.js
import Realm from 'realm';
export const HEART_QUEUE_SCHEMA = 'HeartQueue';
export const HeartQueueSchema = {
name : HEART_QUEUE_SCHEMA,
primaryKey : 'id',
properties: {
id : 'int', // primary key
requestTime : {type : 'string', indexed: true}
}
};
const databaseOptions = {
path: 'mizWord.realm',
schema : [HeartQueueSchema],
schemaVersion : 0,
}
export const insertToHeartQueue = (item) => new Promise((resolve, reject) => {
Realm.open(databaseOptions).then(realm => {
realm.write(()=>{
realm.create(HEART_QUEUE_SCHEMA, item);
resolve(item);
})
}).catch((error) => reject(error));
});
export const updateHeartQueue = (item) => new Promise((resolve, reject) => {
Realm.open(databaseOptions).then(realm => {
realm.write(()=>{
let updatingRow = realm.objectForPrimaryKey(HEART_QUEUE_SCHEMA, item.id);
updatingRow.requestTime = 'hello world';
resolve();
})
}).catch((error) => reject(error));
});
export const deleteHeartQueue = (itemID) => new Promise((resolve, reject) => {
Realm.open(databaseOptions).then(realm => {
realm.write(()=>{
let updatingRow = realm.objectForPrimaryKey(HEART_QUEUE_SCHEMA, itemID);
realm.delete(updatingRow);
resolve();
})
}).catch((error) => reject(error));
});
export const deleteAllHeartQueue = () => new Promise((resolve, reject) => {
Realm.open(databaseOptions).then(realm => {
realm.write(()=>{
let updatingRows = realm.objects(HEART_QUEUE_SCHEMA);
realm.delete(updatingRows);
resolve();
})
}).catch((error) => reject(error));
});
export const getAllHeartQueue = () => new Promise((resolve, reject) => {
Realm.open(databaseOptions).then(realm => {
let allHeartsList = realm.objects(HEART_QUEUE_SCHEMA);
resolve(allHeartsList);
}).catch((error) => reject(error));
});
export default new Realm(databaseOptions)
and here is my app.js file
import realm from './databases';
import {insertToHeartQueue, deleteHeartQueue, deleteAllHeartQueue, getAllHeartQueue} from './databases'
export default class App extends Component {
constructor(){
super();
this.state = {
data : "test",
time : 0,
testDB : '',
xxxz : []
}
}
_readDB = () => {
getAllHeartQueue().then((allHeartsList)=>{
console.log('data',allHeartsList);
this.setState({
xxxz : allHeartsList
})
}).catch((err)=>{
alert(err)
});
}
render() {
console.log('state', this.state.xxxz)
return (
<View style={styles.container}>
<Text style={styles.welcome}>Welcome to React Native!</Text>
<Text style={styles.welcome}>{this.state.time}</Text>
<View>
<Button
onPress={()=> this._readDB()}
title="Ask for Data"
color="#cc77v"
accessibilityLabel="Learn more about this purple button"
/>
<View>
</View>
</View>
</View>
);
}
}
bu I always get this:
Proxy {type: "object", optional: false, Symbol(realm): 140510983537104, Symbol(id): 175, …}

Answer 1

Try to love resolve() outside the write transactions.