feat(JoinResource3TiersService): add findAllRelations method with one parameter

solidify-controller/src/main/java/ch/unige/solidify/service/JoinResource3TiersService.java

@@ -48,7 +48,20 @@ public abstract class JoinResource3TiersService<T extends Resource, V extends Re
         extends JoinResourceNTiersService<T, V, J> {
 
   /**
-   * Find all relations between the parent and the child and any grandchildren
+   * Find all relations in which the parent is involved
+   *
+   * @param parentId
+   * @return
+   */
+  public List<J> findAllRelations(String parentId) {
+    Join3TiersSpecification<J> specification = this.getJoinSpecification(parentId, null, null);
+    specification.setFilterOnChildResId(false);
+    specification.setFilterOnGrandChildResId(false);
+    return this.joinRepository.findAll(specification);
+  }
+
+  /**
+   * Find all relations between the parent and the child
    *
    * @param parentId
    * @param childId