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curl -X POST http://localhost:8080/todos -H 'Content-Type: application/json' -d '{ "content" : "내용1" }'

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{
    "id": 3,
    "content": "내용1",
    "done": false,
    "createdAt": "2019-08-28T19:57:51.298743",
    "modifiedAt": "2019-08-28T19:57:51.298743"
}

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package org.springframework.data.repository.reactive;

import org.reactivestreams.Publisher;
import org.springframework.data.repository.NoRepositoryBean;
import org.springframework.data.repository.Repository;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@NoRepositoryBean
public interface ReactiveCrudRepository<T, ID> extends Repository<T, ID> {

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.M6</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

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<dependency>
    <groupId>org.springframework.boot.experimental</groupId>
    <artifactId>spring-boot-starter-data-r2dbc</artifactId>
    <version>${spring-boot-data-r2dbc.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot.experimental</groupId>
    <artifactId>spring-boot-starter-r2dbc-h2</artifactId>
    <version>${spring-boot-data-r2dbc.version}</version>
</dependency>

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<repositories>
    <repository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
    <repository>

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spring:
  profiles:
    active: dev
  main:
    allow-bean-definition-overriding: true

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drop table if exists todos;
create table todos (
 id bigint generated by default as identity, 
 content varchar(2000), 
 created_at timestamp,
 done boolean, 
 modified_at timestamp, 
 primary key (id)
);

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package com.digimon.demo.config

import io.r2dbc.h2.H2ConnectionConfiguration
import io.r2dbc.h2.H2ConnectionFactory
import io.r2dbc.spi.ConnectionFactory
import org.springframework.context.annotation.Configuration
import org.springframework.data.r2dbc.config.AbstractR2dbcConfiguration
import org.springframework.data.r2dbc.repository.config.EnableR2dbcRepositories

@Configuration

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package com.digimon.demo.domain.todo

import org.springframework.data.annotation.Id
import org.springframework.data.relational.core.mapping.Table
import java.time.LocalDateTime

@Table("todos")
data class Todo(
        @Id
        var id: Long? = null,