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App.tsx
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App.tsx
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import {Database, Model, Q} from '@nozbe/watermelondb';
import SQLiteAdapter from '@nozbe/watermelondb/adapters/sqlite';
import DatabaseProvider, {
withDatabase,
} from '@nozbe/watermelondb/DatabaseProvider';
import {text, writer} from '@nozbe/watermelondb/decorators';
import withObservables from '@nozbe/with-observables';
import React, {useEffect, useState} from 'react';
import {Button, StyleSheet, Text, View} from 'react-native';
import {compose} from 'recompose';
import {appSchema, tableSchema} from '@nozbe/watermelondb';
enum Location {
YARD = 'yard',
PORCH = 'porch',
}
const schema = appSchema({
version: 1,
tables: [
tableSchema({
name: 'posts',
columns: [{name: 'location', type: 'string'}],
}),
],
});
class Post extends Model {
static table = 'posts';
@text('location') location: string;
static async createOne(db: Database, loc: Location) {
return await db.write(async () => {
return await db.get<Post>('posts').create(post => {
post.location = loc;
});
});
}
@writer async updateLocation(loc: Location) {
return await this.update(post => {
post.location = loc;
});
}
}
export default function App() {
const [db, setDB] = useState<Database>();
useEffect(() => {
const adapter = new SQLiteAdapter({
schema,
onSetUpError: error => {
console.error('Unexpected DB fail');
},
});
setDB(
new Database({
adapter,
modelClasses: [Post],
}),
);
}, []);
async function createLocatedPost() {
return await db!.write(async () => {
return await db!.get<Post>('posts').create(post => {
post.location = Location.PORCH;
});
});
}
async function createThenSetLoc() {
const created = await db!.write(async () => {
return await db!.get<Post>('posts').create(post => {
post.location = Location.YARD;
});
});
return await created.updateLocation(Location.PORCH);
}
async function createLoadSet() {
const created = await db!.write(async () => {
return await db!.get<Post>('posts').create(post => {
post.location = Location.YARD;
});
});
const loaded = await db!.get<Post>('posts').find(created.id);
return await loaded.updateLocation(Location.PORCH);
}
return db ? (
<DatabaseProvider database={db}>
<View style={styles.container}>
<LiveCounter />
<Button
onPress={createLocatedPost}
title="Create Post w/Location Set"
/>
<Button
onPress={createThenSetLoc}
title="Create Post, Then Set Location"
/>
<Button
onPress={createLoadSet}
title="Create, Reload, Then Set Location"
/>
</View>
</DatabaseProvider>
) : null;
}
interface LiveProps {
count: number;
}
function Counter(props: LiveProps) {
return <Text>{`Total post count: ${props.count}`}</Text>;
}
const LiveCounter = compose<LiveProps, {}>(
withDatabase,
withObservables<{database: Database}, LiveProps>([], ({database}) => ({
count: database
.get<Post>('posts')
.query(Q.where('location', Location.PORCH))
.observeCount() as unknown as number,
})),
)(Counter);
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
});