标签关系维护添加判断关系是否已经存在逻辑

src/main/java/com/keymobile/tagmanager/api/TagRelCtrl.java

@@ -36,6 +36,10 @@ public class TagRelCtrl {
 		if(sourceId.equals(targetId)) {
 			throw new Exception("can not make source and target as the same one.");
 		}
+		//判断关系是否存在
+		if(tagRelService.tagRelExist(sourceId, targetId)) {
+			throw new Exception("the tag relation is exist");
+		}
 		return tagRelService.addTagRel(sourceId, targetId, userId, org);
 	}
 	

src/main/java/com/keymobile/tagmanager/persistence/TagRelRepository.java

 package com.keymobile.tagmanager.persistence;
 
 import java.util.List;
+import java.util.Optional;
 
 import org.springframework.data.mongodb.repository.MongoRepository;
 
@@ -11,4 +12,6 @@ public interface TagRelRepository extends MongoRepository<TagRelation, String>{
 	List<TagRelation> findBySourceId(String sourceId);
 	
 	List<TagRelation> findByTargetId(String targetId);
+	
+	Optional<TagRelation> findBySourceIdAndTargetId(String sourceId,String targetId);
 }

src/main/java/com/keymobile/tagmanager/service/TagRelService.java

 package com.keymobile.tagmanager.service;
 
 import java.util.List;
+import java.util.Optional;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
@@ -14,6 +15,15 @@ public class TagRelService {
 	@Autowired
 	private TagRelRepository tagRelRepo;
 	
+	//判断关系是否存在
+	public boolean tagRelExist(String sourceId,String targetId) {
+		Optional<TagRelation> tagRel = tagRelRepo.findBySourceIdAndTargetId(sourceId, targetId);
+		if(tagRel.isPresent()) {
+			return true;
+		}
+		return false;
+	}
+	
 	public TagRelation addTagRel(String sourceId,String targetId,String userName,String org) {
 		TagRelation tagRel = new TagRelation(sourceId,targetId,userName,org);
 		return tagRelRepo.save(tagRel);