Final Results

Your top-level build.gradle file should look like:

buildscript {
  ext.nav_version = '2.3.5'

  repositories {
    google()
    mavenCentral()
  }

  dependencies {
    classpath 'com.android.tools.build:gradle:7.0.2'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.21"
    classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
  }
}

task clean(type: Delete) {
  delete rootProject.buildDir
}

ext {
  koin_version = "3.1.2"
  room_version = "2.3.0"
}

(from T22-Room/ToDo/build.gradle)

And your app module’sbuild.gradle file should resemble:

plugins {
  id 'com.android.application'
  id 'kotlin-android'
  id 'androidx.navigation.safeargs.kotlin'
  id 'kotlin-kapt'
}

android {
  compileSdk 31

  defaultConfig {
    applicationId "com.commonsware.todo"
    minSdk 21
    targetSdk 31
    versionCode 1
    versionName "1.0"

    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
  }

  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
  }

  buildFeatures {
    viewBinding true
  }

  compileOptions {
    coreLibraryDesugaringEnabled true
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }

  kotlinOptions {
    jvmTarget = '1.8'
  }
}

dependencies {
  implementation 'androidx.core:core-ktx:1.6.0'
  implementation 'androidx.appcompat:appcompat:1.3.1'
  implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
  implementation "androidx.recyclerview:recyclerview:1.2.1"
  implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
  implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
  implementation 'com.google.android.material:material:1.4.0'
  implementation "io.insert-koin:koin-android:$koin_version"
  implementation "androidx.room:room-runtime:$room_version"
  implementation "androidx.room:room-ktx:$room_version"
  kapt "androidx.room:room-compiler:$room_version"
  coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
  testImplementation 'junit:junit:4.13.2'
  androidTestImplementation 'androidx.test.ext:junit:1.1.3'
  androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

(from T22-Room/ToDo/app/build.gradle)

ToDoEntity should now look like:

package com.commonsware.todo.repo

import androidx.room.*
import kotlinx.coroutines.flow.Flow
import java.time.Instant
import java.util.*

@Entity(tableName = "todos", indices = [Index(value = ["id"])])
data class ToDoEntity(
  val description: String,
  @PrimaryKey
  val id: String = UUID.randomUUID().toString(),
  val notes: String = "",
  val createdOn: Instant = Instant.now(),
  val isCompleted: Boolean = false
) {
  constructor(model: ToDoModel) : this(
    id = model.id,
    description = model.description,
    isCompleted = model.isCompleted,
    notes = model.notes,
    createdOn = model.createdOn
  )

  fun toModel(): ToDoModel {
    return ToDoModel(
      id = id,
      description = description,
      isCompleted = isCompleted,
      notes = notes,
      createdOn = createdOn
    )
  }

  @Dao
  interface Store {
    @Query("SELECT * FROM todos ORDER BY description")
    fun all(): Flow<List<ToDoEntity>>

    @Query("SELECT * FROM todos WHERE id = :modelId")
    fun find(modelId: String?): Flow<ToDoEntity?>

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun save(vararg entities: ToDoEntity)

    @Delete
    suspend fun delete(vararg entities: ToDoEntity)
  }
}

(from T22-Room/ToDo/app/src/main/java/com/commonsware/todo/repo/ToDoEntity.kt)

ToDoDatabase should look like:

package com.commonsware.todo.repo

import android.content.Context
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase
import androidx.room.TypeConverters

private const val DB_NAME = "stuff.db"

@Database(entities = [ToDoEntity::class], version = 1)
@TypeConverters(TypeTransmogrifier::class)
abstract class ToDoDatabase : RoomDatabase() {
  abstract fun todoStore(): ToDoEntity.Store

  companion object {
    fun newInstance(context: Context) =
      Room.databaseBuilder(context, ToDoDatabase::class.java, DB_NAME).build()
  }
}

(from T22-Room/ToDo/app/src/main/java/com/commonsware/todo/repo/ToDoDatabase.kt)

And ToDoApp now should resemble:

package com.commonsware.todo

import android.app.Application
import com.commonsware.todo.repo.ToDoDatabase
import com.commonsware.todo.repo.ToDoRepository
import com.commonsware.todo.ui.SingleModelMotor
import com.commonsware.todo.ui.roster.RosterMotor
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.SupervisorJob
import org.koin.android.ext.koin.androidContext
import org.koin.android.ext.koin.androidLogger
import org.koin.androidx.viewmodel.dsl.viewModel
import org.koin.core.context.startKoin
import org.koin.core.qualifier.named
import org.koin.dsl.module

class ToDoApp : Application() {
  private val koinModule = module {
    single(named("appScope")) { CoroutineScope(SupervisorJob()) }
    single { ToDoDatabase.newInstance(androidContext()) }
    single {
      ToDoRepository(
        get<ToDoDatabase>().todoStore(),
        get(named("appScope"))
      )
    }
    viewModel { RosterMotor(get()) }
    viewModel { (modelId: String) -> SingleModelMotor(get(), modelId) }
  }

  override fun onCreate() {
    super.onCreate()

    startKoin {
      androidLogger()
      androidContext(this@ToDoApp)
      modules(koinModule)
    }
  }
}

(from T22-Room/ToDo/app/src/main/java/com/commonsware/todo/ToDoApp.kt)

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