feat: add pioneer medal dto

backend/src/main/java/com/openisle/dto/PioneerMedalDto.java

@@ -0,0 +1,10 @@
+package com.openisle.dto;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class PioneerMedalDto extends MedalDto {
+    private long rank;
+}

backend/src/main/java/com/openisle/model/MedalType.java

@@ -4,5 +4,6 @@ public enum MedalType {
     COMMENT,
     POST,
     CONTRIBUTOR,
-    SEED
+    SEED,
+    PIONEER
 }

backend/src/main/java/com/openisle/repository/UserRepository.java

@@ -2,6 +2,7 @@ package com.openisle.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 import com.openisle.model.User;
+import java.time.LocalDateTime;
 import java.util.Optional;
 
 public interface UserRepository extends JpaRepository<User, Long> {
@@ -10,4 +11,5 @@ public interface UserRepository extends JpaRepository<User, Long> {
     java.util.List<User> findByUsernameContainingIgnoreCase(String keyword);
     java.util.List<User> findByRole(com.openisle.model.Role role);
     long countByExperienceGreaterThanEqual(int experience);
+    long countByCreatedAtBefore(LocalDateTime createdAt);
 }

backend/src/main/java/com/openisle/service/MedalService.java

@@ -5,6 +5,7 @@ import com.openisle.dto.ContributorMedalDto;
 import com.openisle.dto.MedalDto;
 import com.openisle.dto.PostMedalDto;
 import com.openisle.dto.SeedUserMedalDto;
+import com.openisle.dto.PioneerMedalDto;
 import com.openisle.model.MedalType;
 import com.openisle.model.User;
 import com.openisle.repository.CommentRepository;
@@ -24,6 +25,7 @@ public class MedalService {
     private static final long POST_TARGET = 100;
     private static final LocalDateTime SEED_USER_DEADLINE = LocalDateTime.of(2025, 9, 16, 0, 0);
     private static final long CONTRIBUTION_TARGET = 1;
+    private static final long PIONEER_LIMIT = 1000;
 
     private final CommentRepository commentRepository;
     private final PostRepository postRepository;
@@ -102,6 +104,21 @@ public class MedalService {
         }
         seedUserMedal.setSelected(selected == MedalType.SEED);
         medals.add(seedUserMedal);
+
+        PioneerMedalDto pioneerMedal = new PioneerMedalDto();
+        pioneerMedal.setIcon("https://openisle-1307107697.cos.ap-guangzhou.myqcloud.com/assert/icons/achi_pioneer.png");
+        pioneerMedal.setTitle("开山鼻祖");
+        pioneerMedal.setDescription("前1000位加入的用户");
+        pioneerMedal.setType(MedalType.PIONEER);
+        if (user != null) {
+            long rank = userRepository.countByCreatedAtBefore(user.getCreatedAt()) + 1;
+            pioneerMedal.setRank(rank);
+            pioneerMedal.setCompleted(rank <= PIONEER_LIMIT);
+        } else {
+            pioneerMedal.setCompleted(false);
+        }
+        pioneerMedal.setSelected(selected == MedalType.PIONEER);
+        medals.add(pioneerMedal);
         if (user != null && selected == null) {
             for (MedalDto medal : medals) {
                 if (medal.isCompleted()) {
@@ -126,6 +143,8 @@ public class MedalService {
             user.setDisplayMedal(MedalType.POST);
         } else if (contributorService.getContributionLines(user.getUsername()) >= CONTRIBUTION_TARGET) {
             user.setDisplayMedal(MedalType.CONTRIBUTOR);
+        } else if (userRepository.countByCreatedAtBefore(user.getCreatedAt()) < PIONEER_LIMIT) {
+            user.setDisplayMedal(MedalType.PIONEER);
         } else if (user.getCreatedAt().isBefore(SEED_USER_DEADLINE)) {
             user.setDisplayMedal(MedalType.SEED);
         }

backend/src/test/java/com/openisle/service/MedalServiceTest.java

@@ -27,7 +27,7 @@ class MedalServiceTest {
 
         List<MedalDto> medals = service.getMedals(null);
         medals.forEach(m -> assertFalse(m.isCompleted()));
-        assertEquals(4, medals.size());
+        assertEquals(5, medals.size());
     }
 
     @Test
@@ -40,6 +40,7 @@ class MedalServiceTest {
         when(commentRepo.countByAuthor_Id(1L)).thenReturn(120L);
         when(postRepo.countByAuthor_Id(1L)).thenReturn(80L);
         when(contributorService.getContributionLines(anyString())).thenReturn(0L);
+        when(userRepo.countByCreatedAtBefore(any())).thenReturn(50L);
         User user = new User();
         user.setId(1L);
         user.setCreatedAt(LocalDateTime.of(2025, 9, 15, 0, 0));
@@ -56,6 +57,8 @@ class MedalServiceTest {
         assertFalse(medals.stream().filter(m -> m.getType() == MedalType.POST).findFirst().orElseThrow().isSelected());
         assertTrue(medals.stream().filter(m -> m.getType() == MedalType.SEED).findFirst().orElseThrow().isCompleted());
         assertFalse(medals.stream().filter(m -> m.getType() == MedalType.SEED).findFirst().orElseThrow().isSelected());
+        assertTrue(medals.stream().filter(m -> m.getType() == MedalType.PIONEER).findFirst().orElseThrow().isCompleted());
+        assertFalse(medals.stream().filter(m -> m.getType() == MedalType.PIONEER).findFirst().orElseThrow().isSelected());
         verify(userRepo).save(user);
     }
 
@@ -69,6 +72,7 @@ class MedalServiceTest {
         when(commentRepo.countByAuthor_Id(1L)).thenReturn(120L);
         when(postRepo.countByAuthor_Id(1L)).thenReturn(0L);
         when(contributorService.getContributionLines(anyString())).thenReturn(0L);
+        when(userRepo.countByCreatedAtBefore(any())).thenReturn(0L);
         User user = new User();
         user.setId(1L);
         user.setCreatedAt(LocalDateTime.of(2025, 9, 15, 0, 0));
@@ -90,6 +94,7 @@ class MedalServiceTest {
         when(commentRepo.countByAuthor_Id(1L)).thenReturn(10L);
         when(postRepo.countByAuthor_Id(1L)).thenReturn(0L);
         when(contributorService.getContributionLines(anyString())).thenReturn(0L);
+        when(userRepo.countByCreatedAtBefore(any())).thenReturn(0L);
         User user = new User();
         user.setId(1L);
         user.setCreatedAt(LocalDateTime.of(2025, 9, 15, 0, 0));

frontend_nuxt/components/AchievementList.vue

@@ -29,6 +29,7 @@
         <template v-else-if="medal.type === 'CONTRIBUTOR'">
           {{ medal.currentContributionLines }}/{{ medal.targetContributionLines }}
         </template>
+        <template v-else-if="medal.type === 'PIONEER'"> 第{{ medal.rank }}位 </template>
       </div>
     </div>
   </div>

frontend_nuxt/utils/medal.js

@@ -3,6 +3,7 @@ export const medalTitles = {
   POST: '发帖达人',
   SEED: '种子用户',
   CONTRIBUTOR: '贡献者',
+  PIONEER: '开山鼻祖',
 }
 
 export function getMedalTitle(type) {