use kotlin serialization

build.gradle

@@ -7,15 +7,21 @@ buildscript {
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "com.github.jengelman.gradle.plugins:shadow:5.2.0"
+        classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
     }
 }
 
+plugins {
+    id 'org.jetbrains.kotlin.plugin.serialization' version '1.5.21'
+}
+
 tasks.withType(JavaCompile) {
     sourceCompatibility = JavaVersion.VERSION_11
     targetCompatibility = JavaVersion.VERSION_11
 }
 
 apply plugin: 'kotlin'
+apply plugin: 'kotlinx-serialization'
 apply plugin: "com.github.johnrengelman.shadow"
 apply plugin: 'application'
 
@@ -47,13 +53,15 @@ dependencies {
     compile 'org.jetbrains.exposed:exposed-jdbc:0.33.1'
     compile 'org.jetbrains.exposed:exposed-java-time:0.33.1'
     compile 'com.zaxxer:HikariCP:5.0.0'
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.2"
+    implementation "org.jetbrains.kotlinx:kotlinx-datetime:0.2.1"
     implementation "io.insert-koin:koin-core:$koin_version"
     implementation "io.insert-koin:koin-ktor:$koin_version"
+    implementation "io.ktor:ktor-serialization:$ktor_version"
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
     implementation "io.ktor:ktor-server-netty:$ktor_version"
     implementation "ch.qos.logback:logback-classic:$logback_version"
     implementation "io.ktor:ktor-server-core:$ktor_version"
-    implementation "io.ktor:ktor-gson:$ktor_version"
     implementation "io.ktor:ktor-server-host-common:$ktor_version"
     implementation "io.ktor:ktor-client-core:$ktor_version"
     implementation "io.ktor:ktor-client-core-jvm:$ktor_version"

src/Application.kt

@@ -5,11 +5,11 @@ import io.ktor.application.*
 import io.ktor.response.*
 import io.ktor.routing.*
 import io.ktor.http.*
-import io.ktor.gson.*
 import io.ktor.features.*
 import org.apache.http.HttpException
 import com.kmalbz.database.DatabaseFactory
 import com.kmalbz.database.dao.SampleObjects
+import io.ktor.serialization.*
 import io.ktor.util.*
 import org.jetbrains.exposed.sql.SchemaUtils
 import org.jetbrains.exposed.sql.transactions.transaction
@@ -21,8 +21,7 @@ fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args)
 @Suppress("unused") // Referenced in application.conf
 fun Application.module() {
     install(ContentNegotiation) {
-        gson {
-        }
+        json()
     }
 
     install(Koin) {

src/api/model/ApiObject.kt

@@ -1,10 +1,11 @@
 package com.kmalbz.api.model
 
-import com.google.gson.annotations.SerializedName
-import java.time.LocalDate
+import kotlinx.datetime.LocalDateTime
+import kotlinx.serialization.Serializable
 
+@Serializable
 data class ApiObject(
-    @SerializedName("tag") val tag: String,
-    @SerializedName("device_id") val device_id: Int,
-    @SerializedName("device_date") val device_date: LocalDate
+    val tag: String,
+    val device_id: Int,
+    val device_date: LocalDateTime
 )

src/database/dao/SampleObjects.kt

@@ -2,13 +2,13 @@ package com.kmalbz.database.dao
 
 import org.jetbrains.exposed.dao.id.IntIdTable
 import org.jetbrains.exposed.sql.*
-import org.jetbrains.exposed.sql.`java-time`.date
-import java.time.LocalDate
+import org.jetbrains.exposed.sql.`java-time`.datetime
+import java.time.LocalDateTime
 
 object SampleObjects : IntIdTable() {
     val tag: Column<String> = varchar("tag", 32)
-    val timestamp: Column<LocalDate> = date("timestamp").default(LocalDate.now())
+    val timestamp: Column<LocalDateTime> = datetime("timestamp").default(LocalDateTime.now())
     val device_id: Column<Int> = integer("device_id")
-    val device_date: Column<LocalDate> = date("device_date")
+    val device_date: Column<LocalDateTime> = datetime("device_date")
     override val primaryKey = PrimaryKey(id, name = "PK_SampleObject_Id")
 }

src/database/service/ISampleObjectService.kt

@@ -1,8 +1,7 @@
 package com.kmalbz.database.service
 
 import com.kmalbz.api.model.ApiObject
-import java.time.LocalDate
-import java.util.*
+import kotlinx.datetime.LocalDateTime
 
 interface ISampleObjectService{
     fun addOne(apiObject: ApiObject)
@@ -11,7 +10,7 @@ interface ISampleObjectService{
     suspend fun getPage(page: Long): List<ApiObject>
     suspend fun getSampleObjectbyDeviceID(device_id: Int): List<ApiObject>
     suspend fun getSampleObjectbyTag(tag: String): ApiObject?
-    suspend fun getSampleObjectbyDate(date: LocalDate): List<ApiObject>
-    suspend fun getSampleObjectbeforeDate(date: LocalDate): List<ApiObject>
-    suspend fun getSampleObjectafterDate(date: LocalDate): List<ApiObject>
+    suspend fun getSampleObjectbyDate(date: LocalDateTime): List<ApiObject>
+    suspend fun getSampleObjectbeforeDate(date: LocalDateTime): List<ApiObject>
+    suspend fun getSampleObjectafterDate(date: LocalDateTime): List<ApiObject>
 }

src/database/service/SampleObjectService.kt

@@ -5,11 +5,13 @@ import com.kmalbz.database.model.SampleObject
 import com.kmalbz.database.dao.SampleObjects
 import com.kmalbz.api.model.ApiObject
 import io.ktor.util.*
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.toJavaLocalDateTime
+import kotlinx.datetime.toKotlinLocalDateTime
 import org.jetbrains.exposed.sql.ResultRow
 import org.jetbrains.exposed.sql.select
 import org.jetbrains.exposed.sql.selectAll
 import org.jetbrains.exposed.sql.transactions.transaction
-import java.time.LocalDate
 
 
 @KtorExperimentalAPI
@@ -19,7 +21,7 @@ class SampleObjectService : ISampleObjectService {
         transaction {
             SampleObject.new {
                 tag = apiObject.tag
-                device_date = apiObject.device_date
+                device_date = apiObject.device_date.toJavaLocalDateTime()
                 device_id = apiObject.device_id
             }
         }
@@ -50,28 +52,28 @@ class SampleObjectService : ISampleObjectService {
             .singleOrNull()
     }
 
-    override suspend fun getSampleObjectbyDate(date: LocalDate): List<ApiObject> = dbQuery {
+    override suspend fun getSampleObjectbyDate(date: LocalDateTime): List<ApiObject> = dbQuery {
         SampleObjects.select {
-            (SampleObjects.timestamp eq date)
+            (SampleObjects.timestamp eq date.toJavaLocalDateTime())
         }.mapNotNull { toSampleObject(it) }
     }
 
-    override suspend fun getSampleObjectbeforeDate(date: LocalDate): List<ApiObject> = dbQuery {
+    override suspend fun getSampleObjectbeforeDate(date: LocalDateTime): List<ApiObject> = dbQuery {
         SampleObjects.select {
-            (SampleObjects.timestamp less  date)
+            (SampleObjects.timestamp less  date.toJavaLocalDateTime())
         }.mapNotNull { toSampleObject(it) }
     }
 
-    override suspend fun getSampleObjectafterDate(date: LocalDate): List<ApiObject> = dbQuery {
+    override suspend fun getSampleObjectafterDate(date: LocalDateTime): List<ApiObject> = dbQuery {
         SampleObjects.select {
-            (SampleObjects.timestamp greater  date)
+            (SampleObjects.timestamp greater  date.toJavaLocalDateTime())
         }.mapNotNull { toSampleObject(it) }
     }
 
     private fun toSampleObject(row: ResultRow): ApiObject =
         ApiObject(
             tag = row[SampleObjects.tag],
-            device_date = row[SampleObjects.device_date],
+            device_date = row[SampleObjects.device_date].toKotlinLocalDateTime(),
             device_id = row[SampleObjects.device_id]
         )
 }