CODEWITHSUNDEEP
javaspringthymeleaf
mattsky
mattsky

Reputation: 25

How to display this entity in thymeleaf?

I'm writing simple task managment app in Spring boot. I've got entity:

@Entity
@Table(name = "project")
public class Project {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "project_id")
    private Long projectId;
    @Column
    private String name;

    @OneToMany
    @JoinColumn(name = "task_id")
    private List<Task> task;
    // getters and setter omitted

I try to display this in Thymeleaf in that way:

<div th:each="project : ${projects}">
    <div th:text="${project.name}"></div>
        <div th:each="task : ${project.task}">
            <div th:text="${task.name}"></div>
        </div>
</div>

It's shows only projects but I can't see my tasks. What I'm doing wrong ?

Upvotes: 0

Views: 937

Answers (1)

Lukehey
Lukehey

Reputation: 1354

This probably happens because project.task is null, therefore there is no iteration. By default, attributes that include complex/custom (usually stored in a different table) objects are not selected from your database when you do a query on the parent object (lazy loading).

You can verify this by a simple check in your HTML, e.g.:

<p th:if="${project.task} == null">Task is indeed null</p>

Quick fix:

@OneToMany(fetch = FetchType.EAGER)

Upvotes: 2

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