Introduce realm and persist temperatures

android/app/build.gradle

@@ -137,6 +137,7 @@ android {
 }
 
 dependencies {
+    compile project(':realm')
     compile fileTree(dir: "libs", include: ["*.jar"])
     compile "com.android.support:appcompat-v7:23.0.1"
     compile "com.facebook.react:react-native:+"  // From node_modules

android/app/src/main/java/com/drip/MainApplication.java

@@ -3,6 +3,7 @@ package com.drip;
 import android.app.Application;
 
 import com.facebook.react.ReactApplication;
+import io.realm.react.RealmReactPackage;
 import com.facebook.react.ReactNativeHost;
 import com.facebook.react.ReactPackage;
 import com.facebook.react.shell.MainReactPackage;
@@ -22,7 +23,8 @@ public class MainApplication extends Application implements ReactApplication {
     @Override
     protected List<ReactPackage> getPackages() {
       return Arrays.<ReactPackage>asList(
-          new MainReactPackage()
+          new MainReactPackage(),
+            new RealmReactPackage()
       );
     }
 

android/settings.gradle

@@ -1,3 +1,5 @@
 rootProject.name = 'drip'
+include ':realm'
+project(':realm').projectDir = new File(rootProject.projectDir, '../node_modules/realm/android')
 
 include ':app'

db.js

@@ -0,0 +1,57 @@
+import realm from 'realm'
+import { v4 as uuid } from 'uuid'
+
+let db
+let cycleDaysSortedbyTempValueView = []
+
+const TemperatureSchema = {
+  name: 'Temperature',
+  properties: {
+    value: 'int',
+    exclude: 'bool'
+  }
+}
+
+const CycleDaySchema = {
+  name: 'CycleDay',
+  primaryKey: 'key',
+  properties: {
+    key: 'string',
+    date: 'date',
+    temperature: {
+      type: 'Temperature',
+      optional: true
+    }
+  }
+}
+
+async function openDatabase() {
+  db = await realm.open({
+    schema: [
+      CycleDaySchema,
+      TemperatureSchema
+    ],
+    // we only want this in dev mode
+    deleteRealmIfMigrationNeeded: true
+  })
+  // just for testing purposes, the highest temperature will be topmost
+  // because I was too layz to make a scroll view
+  cycleDaysSortedbyTempValueView = db.objects('CycleDay').sorted('temperature.value', true)
+}
+
+async function saveTemperature(date, temperature) {
+  db.write(() => {
+    const doc = {
+      key: uuid(),
+      date,
+      temperature
+    }
+    db.create('CycleDay', doc)
+  })
+}
+
+export {
+  cycleDaysSortedbyTempValueView,
+  openDatabase,
+  saveTemperature
+}

index.js

@@ -1,4 +1,9 @@
 import { AppRegistry } from 'react-native'
 import Home from './app'
+import { openDatabase } from './db'
 
-AppRegistry.registerComponent('home', () => Home)
+// TODO error handling
+openDatabase()
+  .then(() => {
+    AppRegistry.registerComponent('home', () => Home)
+  })

list.js

@@ -4,25 +4,17 @@ import {
   Text,
   Button,
   TextInput,
-  FlatList
+  FlatList,
+  Keyboard
 } from 'react-native'
-import * as styles from './styles'
-import Datastore from 'react-native-local-mongodb'
 
-const db = new Datastore({ filename: 'asyncStorageKey', autoload: true })
+import * as styles from './styles'
+import { cycleDaysSortedbyTempValueView, saveTemperature } from './db'
 
 export default class Temp extends Component {
   constructor(props) {
     super(props)
-    this.state = {
-      temperatures: []
-    }
-    db.find({ key: { $exists: true } }, (err, persistedTemperatures) => {
-      if (err) throw err
-      this.setState({
-        temperatures: [...persistedTemperatures, ...this.state.temperatures]
-      })
-    })
+    this.state = { currentValue: '' }
   }
 
   render() {
@@ -33,26 +25,26 @@ export default class Temp extends Component {
           onChangeText={(val) => {
             this.setState({currentValue: val})
           }}
+          keyboardType='numeric'
+          value = {this.state.currentValue}
         />
         <Button
           onPress={() => {
-            const newTemp = {
-              value: this.state.currentValue,
-              key: Date.now().toString()
-            }
-            this.setState({
-              temperatures: [newTemp, ...this.state.temperatures]
-            })
-            db.insert(newTemp, (err) => {
-              if (err) console.log(err)
-            })
+            saveTemperature(
+              new Date(),
+              {
+                value: Number(this.state.currentValue),
+                exclude: false
+              }
+            )
+            this.setState({currentValue: ''})
+            Keyboard.dismiss()
           }}
           title="Save"
         />
         <FlatList
-          data = {this.state.temperatures}
-          extraData = {this.state}
-          renderItem={({item}) => <Text>{item.value}</Text>}
+          data = { cycleDaysSortedbyTempValueView }
+          renderItem={({item}) => <Text>{item.temperature.value}</Text>}
         />
       </View>
     )

package.json

@@ -17,8 +17,9 @@
     "moment": "^2.22.1",
     "react": "16.3.1",
     "react-native": "0.55.4",
-    "react-native-local-mongodb": "^2.1.0",
-    "react-navigation": "^2.0.4"
+    "react-navigation": "^2.0.4",
+    "realm": "^2.7.1",
+    "uuid": "^3.2.1"
   },
   "devDependencies": {
     "babel-preset-react-native": "4.0.0",