Thymeleaf Set Binding for Neo4j insert - spring-mvc

Question

I have been working on an Spring MVC application with a Thymeleaf UI. For Neo4j handling entities, I use Set that contains NeoImages that Belong to the class posts:
#Data
#NodeEntity
#Builder
#AllArgsConstructor
#NoArgsConstructor
public class NeoPost {
#Id
#GeneratedValue
Long postId;
#NotNull
#NotBlank
#Size(min = 1, max = 600)
String question;
/**
* Images that are involved in that post
*/
#NotEmpty
#Size(min = 2)
#Relationship(type = "STARES", direction = Relationship.OUTGOING)
Set<Neoimage> neoimageSet = new HashSet<>();
/**
* User that made this post
*/
#Relationship(type = "OWNS", direction = Relationship.INCOMING)
NeoUser user;
/**
* Users that somehow in a way possible described in Userinteractiontype enum
* with this current post.
*/
#Relationship(type = "INTERACTED_WITH", direction = Relationship.INCOMING)
Set<NeoInteraction> incomingInteractions = new HashSet<>();
}
Here the class of the NeoImage type:
#Data
#Builder
#AllArgsConstructor
#NoArgsConstructor
#NodeEntity
public class Neoimage {
#Id
#GeneratedValue
Long imageId;
//For testing purposes use this type of information
#ImageUrlValidator
String imageFull;
}
Do not get me wrong I know that I want to use a Set to store the Neoimages in the Neopost class. The Problem is not the persistence or anything, but I want to delivery input results from a thymeleaf form.
<form autocomplete="off" action="#" th:action="#{/postQuestion}"
th:object="${neoPost}" method="post" role="form">
<div class="form-group">
<div class="col-sm-12">
<label th:if="${#fields.hasErrors('question')}" th:errors="*{question}"
class="validation-message"></label>
<input type="text" th:field="*{question}" placeholder="Question"
class="form-control" />
</div>
</div>
<div class="form-group">
<div class="col-sm-12">
<input type="text" th:field="*{neoimageSet[0].imageFull}"
placeholder="Image 1" class="form-control" /> <label
th:if="${#fields.hasErrors('neoimageSet[0].imageFull')}" th:errors="*{neoimageSet[0].imageFull}"
class="validation-message"></label>
</div>
</div>
<div class="form-group">
<div class="col-sm-12">
<input type="text" th:field="*{neoimageSet[1].imageFull}"
placeholder="Image 1" class="form-control" /> <label
th:if="${#fields.hasErrors('neoimageSet[1].imageFull')}" th:errors="*{neoimageSet[1].imageFull}"
class="validation-message"></label>
</div>
</div>
<div class="form-group">
<div class="col-sm-12">
<button type="submit" class="btn btn-outline-secondary my-2 my-lg-0 loginButton">Upload Post</button>
</div>
</div>
<span th:utext="${successMessage}"></span>
</form>
When I then access the post request, the question is filled in the model as expected, but the neoimageset does not hold the two strings from the two input fields. I have heard that databinding is somehow not possible to a set with thymeleaf. I can fully understand if you need any further elaborations, thank you for helping.

Answer 1

I have solved this issue using a wrapper method within:
/**
* Wrapper method since set elements cannot be accessed by index which is needed in thymeleaf
*/
#Transient
AutoPopulatingList<Neoimage> neoImageWrapperList = new AutoPopulatingList(Neoimage.class);
public AutoPopulatingList<Neoimage> getNeoImageWrapperList() {
//Copy content to neoimageset
this.neoImageWrapperList.forEach(neoimage -> neoimageSet.add(neoimage));
return this.neoImageWrapperList;
}
Now I just call the neoImageWrapperList instead of the actual set.