Add createdAt field to Dailies (#19)

backend-services/feed-service/app/models/Daily.scala

 package models
 
 import repositories.DailyRepository
-import org.bson.types.ObjectId
+
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.{Future, Await}
 import scala.concurrent.duration._
 
+import org.bson.types.ObjectId
+import java.util.Date
+import java.time.Instant
+import java.text.SimpleDateFormat
+
 import play.api.libs.json.Json
 import play.api.libs.json.{Json, JsValue, JsString, JsNumber, JsObject, JsArray}
 
@@ -15,7 +20,8 @@ case class Daily(
     userId: ObjectId,
     questionId: ObjectId,
     content: String,
-    likes: Int
+    likes: Int,
+    createdAt: Date
 )
 
 object Daily {
@@ -27,9 +33,10 @@ object Daily {
         questionId: ObjectId,
         content: String,
         likes: Int = 0,
+        createdAt: Date = Date.from(Instant.now()),
         timeout: Int = 4
     ): Daily = {
-        val daily: Daily = Daily(None, userId, questionId, content, likes)
+        val daily: Daily = Daily(None, userId, questionId, content, likes, createdAt)
         val future: Future[Daily] = dailyRepo.insertDaily(daily)
         Await.result(future, timeout.seconds)
     }
@@ -56,12 +63,16 @@ object Daily {
 
     // Convert from Daily object to JSON (serializing to JSON)
     def toJson(daily: Daily): JsValue = {
+        val dateFormat: SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
+        val formattedDate: String = dateFormat.format(daily.createdAt);
+
         val dailyJson = Seq(
             "id" -> JsString(daily.id.getOrElse("").toString()),
             "userId" -> JsString(daily.userId.toString()),
             "questionId" -> JsString(daily.questionId.toString()),
             "content" -> JsString(daily.content),
-            "likes" -> JsNumber(daily.likes)
+            "likes" -> JsNumber(daily.likes),
+            "createdAt" -> JsString(formattedDate)
         )
         
         Json.toJson(JsObject(dailyJson))

backend-services/feed-service/app/repositories/DailyRepository.scala

@@ -43,14 +43,15 @@ class DailyRepository extends MongoDBClient {
      */
     def getAllDailies(): Future[Seq[Daily]] = {
         val documents: Future[Seq[Document]] = find(dailiesCollection)
-    
+        
         documents.map(document => {
             document.map(doc => Daily(
                 Some(doc.getObjectId("_id")),
                 doc.getObjectId("user_id"),
                 doc.getObjectId("question_id"),
                 doc.getString("content"),
-                doc.getInteger("likes")
+                doc.getInteger("likes"),
+                doc.getDate("createdAt")
             ))
         })
     }
@@ -70,7 +71,8 @@ class DailyRepository extends MongoDBClient {
                 doc.getObjectId("user_id"),
                 doc.getObjectId("question_id"),
                 doc.getString("content"),
-                doc.getInteger("likes")
+                doc.getInteger("likes"),
+                doc.getDate("createdAt")
             ))
         })
     }
@@ -92,7 +94,8 @@ class DailyRepository extends MongoDBClient {
                 doc.getObjectId("user_id"),
                 doc.getObjectId("question_id"),
                 doc.getString("content"),
-                doc.getInteger("likes")
+                doc.getInteger("likes"),
+                doc.getDate("createdAt")
             ))
         })
     }
@@ -108,7 +111,8 @@ class DailyRepository extends MongoDBClient {
             "user_id" -> daily.userId,
             "question_id" -> daily.questionId,
             "content" -> daily.content,
-            "likes" -> daily.likes
+            "likes" -> daily.likes,
+            "createdAt" -> daily.createdAt
         )
 
         val result = insertOne(dailiesCollection, document)