修复关联查询出现重复的join：https://github.com/elunez/eladmin/issues/655

close https://github.com/elunez/eladmin/issues/655

eladmin-common/src/main/java/me/zhengjie/utils/QueryHelp.java

@@ -53,6 +53,7 @@ public class QueryHelp {
             }
         }
         try {
+            Map<String, Join> joinKey = new HashMap<>();
             List<Field> fields = getAllFields(query.getClass(), new ArrayList<>());
             for (Field field : fields) {
                 boolean accessible = field.isAccessible();
@@ -75,14 +76,15 @@ public class QueryHelp {
                         String[] blurrys = blurry.split(",");
                         List<Predicate> orPredicate = new ArrayList<>();
                         for (String s : blurrys) {
-                            orPredicate.add(cb.like(root.get(s)
-                                    .as(String.class), "%" + val.toString() + "%"));
+                            orPredicate.add(cb.like(root.get(s).as(String.class), "%" + val.toString() + "%"));
                         }
                         Predicate[] p = new Predicate[orPredicate.size()];
                         list.add(cb.or(orPredicate.toArray(p)));
                         continue;
                     }
                     if (ObjectUtil.isNotEmpty(joinName)) {
+                        join = joinKey.get(joinName);
+                        if(join == null){
                             String[] joinNames = joinName.split(">");
                             for (String name : joinNames) {
                                 switch (q.join()) {
@@ -110,6 +112,8 @@ public class QueryHelp {
                                     default: break;
                                 }
                             }
+                            joinKey.put(joinName, join);
+                        }
                     }
                     switch (q.type()) {
                         case EQUAL: