Optimize to avoid single selects on OnToMany in mindmap.

wise-webapp/src/main/java/com/wisemapping/model/Collaboration.java

@@ -19,6 +19,9 @@
 package com.wisemapping.model;
 
 
+import org.hibernate.annotations.Fetch;
+import org.hibernate.annotations.FetchMode;
+
 import javax.persistence.*;
 import javax.validation.constraints.NotNull;
 import java.io.Serializable;

wise-webapp/src/main/java/com/wisemapping/model/Mindmap.java

@@ -23,6 +23,8 @@ import com.wisemapping.exceptions.InvalidMindmapException;
 import com.wisemapping.exceptions.WiseMappingException;
 import com.wisemapping.util.ZipUtils;
 import org.apache.commons.lang.StringEscapeUtils;
+import org.hibernate.annotations.Fetch;
+import org.hibernate.annotations.FetchMode;
 import org.hibernate.annotations.NotFound;
 import org.hibernate.annotations.NotFoundAction;
 import org.jetbrains.annotations.NotNull;
@@ -64,9 +66,11 @@ public class Mindmap implements Serializable {
     private boolean isPublic;
 
     @OneToMany(mappedBy = "mindMap", orphanRemoval = true, cascade = {CascadeType.ALL}, fetch = FetchType.LAZY)
+    @Fetch(FetchMode.JOIN)
     private Set<Collaboration> collaborations = new HashSet<>();
 
     @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE})
+    @Fetch(FetchMode.JOIN)
     @JoinTable(
             name = "R_LABEL_MINDMAP",
             joinColumns = @JoinColumn(name = "mindmap_id"),

wise-webapp/src/main/java/com/wisemapping/rest/model/RestMindmapInfo.java

@@ -134,15 +134,8 @@ public class RestMindmapInfo {
     public String getRole() {
         final User user = Utils.getUser();
         String result;
-        if (mindmap.isCreator(user)) {
-            // Performance hack. In case that the person is the creator, assume that the role is owner.
-            // This is to avoid loading all the collaboration maps per map.
-            result = CollaborationRole.OWNER.getLabel();
-        } else {
         final Optional<Collaboration> collaboration = mindmap.findCollaboration(user);
-            result = collaboration.map(value -> value.getRole().getLabel()).orElse(ROLE_NONE);
-        }
-        return result;
+        return  collaboration.map(value -> value.getRole().getLabel()).orElse(ROLE_NONE);
     }
 
     public void setRole(String value) {