From 9a53b8c60c27eceaddaf01353e60c5f857da3ab9 Mon Sep 17 00:00:00 2001
From: Julian Ophals <jophals@asu.edu>
Date: Wed, 18 Jun 2025 23:24:03 -0700
Subject: [PATCH] [story/Q20-24] implemented customized Jackson serializer to
 fix getCollections response id field

---
 quadriga/pom.xml                                 |  6 ++++++
 .../quadriga/config/ObjectIdToStringModule.java  | 12 ++++++++++++
 .../diging/quadriga/config/SpringWebConfig.java  | 16 ++++++++++++++++
 3 files changed, 34 insertions(+)
 create mode 100644 quadriga/src/main/java/edu/asu/diging/quadriga/config/ObjectIdToStringModule.java

diff --git a/quadriga/pom.xml b/quadriga/pom.xml
index d0f530a4..0f084a87 100644
--- a/quadriga/pom.xml
+++ b/quadriga/pom.xml
@@ -188,6 +188,12 @@
             <artifactId>jackson-databind</artifactId>
             <version>2.15.0</version>
         </dependency>
+        
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+            <version>2.19.1</version>
+        </dependency>
 
         <!-- https://mvnrepository.com/artifact/org.mongodb/mongodb-driver-core -->
         <dependency>
diff --git a/quadriga/src/main/java/edu/asu/diging/quadriga/config/ObjectIdToStringModule.java b/quadriga/src/main/java/edu/asu/diging/quadriga/config/ObjectIdToStringModule.java
new file mode 100644
index 00000000..82b48848
--- /dev/null
+++ b/quadriga/src/main/java/edu/asu/diging/quadriga/config/ObjectIdToStringModule.java
@@ -0,0 +1,12 @@
+package edu.asu.diging.quadriga.config;
+
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import org.bson.types.ObjectId;
+
+public class ObjectIdToStringModule extends SimpleModule {
+    public ObjectIdToStringModule() {
+        addSerializer(ObjectId.class, new ToStringSerializer());
+    }
+}
+
diff --git a/quadriga/src/main/java/edu/asu/diging/quadriga/config/SpringWebConfig.java b/quadriga/src/main/java/edu/asu/diging/quadriga/config/SpringWebConfig.java
index d7a1ba2d..469bd112 100644
--- a/quadriga/src/main/java/edu/asu/diging/quadriga/config/SpringWebConfig.java
+++ b/quadriga/src/main/java/edu/asu/diging/quadriga/config/SpringWebConfig.java
@@ -1,8 +1,14 @@
 package edu.asu.diging.quadriga.config;
+
 import org.springframework.context.annotation.Configuration;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
+
+import java.util.List;
 
 @Configuration
 @EnableWebMvc
@@ -12,4 +18,14 @@ public class SpringWebConfig implements WebMvcConfigurer {
     public void addResourceHandlers(final ResourceHandlerRegistry registry) {
         registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
     }
+    
+    @Override
+    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
+        for (HttpMessageConverter<?> converter : converters) {
+            if (converter instanceof MappingJackson2HttpMessageConverter jsonConverter) {
+                ObjectMapper mapper = jsonConverter.getObjectMapper();
+                mapper.registerModule(new ObjectIdToStringModule());
+            }
+        }
+    }
 }
\ No newline at end of file