@rikishi/watermelondb
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Build powerful React Native and React web apps that scale from hundreds to tens of thousands of records and remain fast
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<ol class="chapter"><li class="chapter-item expanded "><a href="ch01-00-get-excited.html"><strong aria-hidden="true">1.</strong> Get excited</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="index.html"><strong aria-hidden="true">1.1.</strong> Check out the README</a></li><li class="chapter-item expanded "><a href="Demo.html"><strong aria-hidden="true">1.2.</strong> See the demo</a></li></ol></li><li class="chapter-item expanded "><a href="ch02-00-learn-to-use.html"><strong aria-hidden="true">2.</strong> Learn to use Watermelon</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="Installation.html"><strong aria-hidden="true">2.1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="Setup.html" class="active"><strong aria-hidden="true">2.2.</strong> Setup</a></li><li class="chapter-item expanded "><a href="Schema.html"><strong aria-hidden="true">2.3.</strong> Schema</a></li><li class="chapter-item expanded "><a href="Model.html"><strong aria-hidden="true">2.4.</strong> Defining Models</a></li><li class="chapter-item expanded "><a href="CRUD.html"><strong aria-hidden="true">2.5.</strong> Create, Read, Update, Delete</a></li><li class="chapter-item expanded "><a href="Components.html"><strong aria-hidden="true">2.6.</strong> Connecting to React Components</a></li><li class="chapter-item expanded "><a href="Query.html"><strong aria-hidden="true">2.7.</strong> Querying</a></li><li class="chapter-item expanded "><a href="Relation.html"><strong aria-hidden="true">2.8.</strong> Relations</a></li><li class="chapter-item expanded "><a href="Writers.html"><strong aria-hidden="true">2.9.</strong> Writers, Readers, batching</a></li></ol></li><li class="chapter-item expanded "><a href="ch03-00-advanced.html"><strong aria-hidden="true">3.</strong> Advanced guides</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="Advanced/Migrations.html"><strong aria-hidden="true">3.1.</strong> Migrations</a></li><li class="chapter-item expanded "><a href="Advanced/Sync.html"><strong aria-hidden="true">3.2.</strong> Sync</a></li><li class="chapter-item expanded "><a href="Advanced/CreateUpdateTracking.html"><strong aria-hidden="true">3.3.</strong> Automatic create/update tracking</a></li><li class="chapter-item expanded "><a href="Advanced/AdvancedFields.html"><strong aria-hidden="true">3.4.</strong> Advanced fields</a></li><li class="chapter-item expanded "><a href="Advanced/Flow.html"><strong aria-hidden="true">3.5.</strong> Flow</a></li><li class="chapter-item expanded "><a href="Advanced/LocalStorage.html"><strong aria-hidden="true">3.6.</strong> LocalStorage</a></li><li class="chapter-item expanded "><a href="Advanced/ProTips.html"><strong aria-hidden="true">3.7.</strong> Pro tips</a></li><li class="chapter-item expanded "><a href="Advanced/Performance.html"><strong aria-hidden="true">3.8.</strong> Performance tips</a></li><li class="chapter-item expanded "><a href="Advanced/SharingDatabaseAcrossTargets.html"><strong aria-hidden="true">3.9.</strong> iOS - Sharing database across targets</a></li></ol></li><li class="chapter-item expanded "><a href="ch04-00-deeper.html"><strong aria-hidden="true">4.</strong> Dig deeper into WatermelonDB</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="Implementation/Architecture.html"><strong aria-hidden="true">4.1.</strong> Architecture</a></li><li class="chapter-item expanded "><a href="Implementation/Adapters.html"><strong aria-hidden="true">4.2.</strong> Adapters</a></li><li class="chapter-item expanded "><a href="Implementation/SyncImpl.html"><strong aria-hidden="true">4.3.</strong> Sync implementation</a></li></ol></li><li class="chapter-item expanded "><a href="ch04-00-deeper.html"><strong aria-hidden="true">5.</strong> Other</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="Roadmap.html"><strong aria-hidden="true">5.1.</strong> Roadmap</a></li><li class="chapter-item expanded "><a href="CONTRIBUTING.html"><strong aria-hidden="true">5.2.</strong> Contributing</a></li><li class="chapter-item expanded "><a href="CHANGELOG.html"><strong aria-hidden="true">5.3.</strong> Changelog</a></li></ol></li></ol>
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<h1 class="menu-title">WatermelonDB documentation</h1>
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<h1 id="set-up-your-app-for-watermelondb"><a class="header" href="#set-up-your-app-for-watermelondb">Set up your app for WatermelonDB</a></h1>
<p>Make sure you <a href="./Installation.html">installed Watermelon</a> before proceeding.</p>
<p>Create <code>model/schema.js</code> in your project. You'll need it for <a href="./Schema.html">the next step</a>.</p>
<pre><code class="language-js">import { appSchema, tableSchema } from '@rikishi/watermelondb'
export default appSchema({
version: 1,
tables: [
// We'll add tableSchemas here later
]
})
</code></pre>
<p>Similarly, create <code>model/migrations.js</code>. (<a href="./Advanced/Migrations.html">More information about migrations</a>):</p>
<pre><code class="language-js">import { schemaMigrations } from '@rikishi/watermelondb/Schema/migrations'
export default schemaMigrations({
migrations: [
// We'll add migration definitions here later
],
})
</code></pre>
<p>Now, in your <code>index.native.js</code>:</p>
<pre><code class="language-js">import { Platform } from 'react-native'
import { Database } from '@rikishi/watermelondb'
import SQLiteAdapter from '@rikishi/watermelondb/adapters/sqlite'
import schema from './model/schema'
import migrations from './model/migrations'
// import Post from './model/Post' // ⬅️ You'll import your Models here
// First, create the adapter to the underlying database:
const adapter = new SQLiteAdapter({
schema,
// (You might want to comment it out for development purposes -- see Migrations documentation)
migrations,
// (optional database name or file system path)
// dbName: 'myapp',
// (recommended option, should work flawlessly out of the box on iOS. On Android,
// additional installation steps have to be taken - disable if you run into issues...)
jsi: true, /* Platform.OS === 'ios' */
// (optional, but you should implement this method)
onSetUpError: error => {
// Database failed to load -- offer the user to reload the app or log out
}
})
// Then, make a Watermelon database from it!
const database = new Database({
adapter,
modelClasses: [
// Post, // ⬅️ You'll add Models to Watermelon here
],
})
</code></pre>
<p>The above will work on React Native (iOS/Android) and NodeJS. For the web, instead of <code>SQLiteAdapter</code> use <code>LokiJSAdapter</code>:</p>
<pre><code class="language-js">import LokiJSAdapter from '@rikishi/watermelondb/adapters/lokijs'
const adapter = new LokiJSAdapter({
schema,
// (You might want to comment out migrations for development purposes -- see Migrations documentation)
migrations,
useWebWorker: false,
useIncrementalIndexedDB: true,
// dbName: 'myapp', // optional db name
// --- Optional, but recommended event handlers:
onQuotaExceededError: (error) => {
// Browser ran out of disk space -- offer the user to reload the app or log out
},
onSetUpError: (error) => {
// Database failed to load -- offer the user to reload the app or log out
},
extraIncrementalIDBOptions: {
onDidOverwrite: () => {
// Called when this adapter is forced to overwrite contents of IndexedDB.
// This happens if there's another open tab of the same app that's making changes.
// Try to synchronize the app now, and if user is offline, alert them that if they close this
// tab, some data may be lost
},
onversionchange: () => {
// database was deleted in another browser tab (user logged out), so we must make sure we delete
// it in this tab as well - usually best to just refresh the page
if (checkIfUserIsLoggedIn()) {
window.location.reload()
}
},
}
})
// The rest is the same!
</code></pre>
<hr />
<h2 id="next-steps"><a class="header" href="#next-steps">Next steps</a></h2>
<p>➡️ After Watermelon is installed, <a href="./Schema.html"><strong>define your app's schema</strong></a></p>
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