MATE-145 : [FEAT] MongoDB 의존성 추가 및 설정 (#131)

* MATE-145 : [FEAT] MongoDB 의존성 추가

* MATE-145 : [FEAT] MongoConfig 클래스 구현

- _class 필드가 저장되지 않도록 설정

build.gradle

@@ -40,6 +40,9 @@ dependencies {
     runtimeOnly 'com.h2database:h2'
     runtimeOnly 'com.mysql:mysql-connector-j'
 
+    // MongoDB
+    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'
+
     // Logging
     implementation 'org.slf4j:slf4j-api'
     implementation 'ch.qos.logback:logback-classic'

src/main/java/com/example/mate/common/config/MongoConfig.java

@@ -0,0 +1,24 @@
+package com.example.mate.common.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.MongoDatabaseFactory;
+import org.springframework.data.mongodb.core.convert.DbRefResolver;
+import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver;
+import org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper;
+import org.springframework.data.mongodb.core.convert.MappingMongoConverter;
+import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
+
+@Configuration
+public class MongoConfig {
+
+    @Bean
+    public MappingMongoConverter mappingMongoConverter(MongoDatabaseFactory mongoDatabaseFactory,
+                                                       MongoMappingContext mongoMappingContext) {
+        DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDatabaseFactory);
+        MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mongoMappingContext);
+        converter.setTypeMapper(new DefaultMongoTypeMapper(null));
+
+        return converter;
+    }
+}