** Create a Database Schema
**
*Folder ./Db/Schema.js
*
export const TodosSchema = {
name:'Todos',
properties:{
_id:'string',
title:'string',
completed:'bool'
},
primaryKey:'_id'
}
App.js
import React, {useEffect, useState} from 'react';
import {Button,ScrollView,StyleSheet,Text,View} from 'react-native';
import Realm from 'realm';
import {TodosSchema} from './db/schema';
import {nanoid} from '@reduxjs/toolkit';
Declareations States
let realm;
const App = () => {
const [data, setData] = useState([]);
create realm instance on app launch
useEffect(() => {
const getRealmInstance = async () => {
try {
realm = await Realm.open({
path: 'myrealm',
schema: [TodosSchema],
});
} catch (e) {
console.log(e);
}
};
let todos = realm.objects('Todos');
setData([...todos]);
getRealmInstance();
}, []);
//CREATE DATA In Object
const createData = () => {
realm.write(() => {
realm.create('Todos', {
_id: nanoid(),
title: 'this is ui',
completed: true,
});
});
** Single Read**
let item =realm.objectForPrimaryKey('Todos','id');
console.log(item)
**UPDATE DATA
**
const UpdateData = id => {
realm.write(() => {
let data = realm.objectForPrimaryKey('Todos', id);
// data.title = 'SDM';
data.completed = true
// console.log(data._id)
console.log(data);
// realm.delete(data)
});
};
DELETE Function
const (DeleteTodo)= id => {
realm.write(() => {
let deletedata = realm.objectForPrimaryKey('Todos', id);
realm.delete(deletedata);
});
};`
return (
<View>
<TextInput style={styles.input} placeholder="title " />
<Button onPress={createData} title="Add Tasks..." />
<ScrollView>
{data.map(item => (
<View key={nanoid()}>
<Text>{item.title} , {String(item.completed)}</Text>
<Text>{item._id}</Text>
<View>
<Button onPress={UpdateData(item._id)} title="Edit" />
<Button onPress={DeleteTodo(item._id)} title="Delete" />
</View>
</View>
))}
</ScrollView>
</View>
);
};
export default App;
const styles = StyleSheet.create({
input: {
height: 40,
margin: 12,
borderWidth: 1,
padding: 10,
},
});
Package.josn
**Dependencies**
`"dependencies": {
"@reduxjs/toolkit": "^1.7.1",
"react": "17.0.2",
"react-native": "0.66.4",
"react-redux": "^7.2.6",
"realm": "^10.11.0",
"redux": "^4.1.2"
},
`
`
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