[jbosstools-issues] [JBoss JIRA] Commented: (JBIDE-3033) Generate Hibernate/JPA - ManyToOne is more preferable choice than OneToOne

[Vitali Yemialyanchyk (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBIDE-3033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12439892#action_12439892 ] 

Vitali Yemialyanchyk commented on JBIDE-3033:
---------------------------------------------

I check result of my One2One generation - and have got an error - "Relationship must have an owner"
currently in one2one case i genarate smth. like this:
====
class Person 
...
@OneToOne(mappedBy="person")
private Foto foto;
...
+++
public class Foto 
...
@OneToOne(mappedBy="foto")
private Person person;
...
====
should be 
====
class Person 
...
@OneToOne(mappedBy="person")
private Foto foto;
...
+++
public class Foto 
...
@OneToOne
@JoinColumn(name="fPersonId")
...
====
there are several unclear things here 
1) which entity should be relationship owner - random selection is possible?
2) JoinColumn -> name - is not easy define correct value here...

so I doubt - should i return this case back to ManyToOne or change it to correct OneToOne generation
where 1) is random selection; 2) @JoinColumn(name="?") - generate this


> Generate Hibernate/JPA - ManyToOne is more preferable choice than OneToOne
> --------------------------------------------------------------------------
>
>                 Key: JBIDE-3033
>                 URL: https://jira.jboss.org/jira/browse/JBIDE-3033
>             Project: Tools (JBoss Tools)
>          Issue Type: Feature Request
>          Components: Hibernate
>    Affects Versions: 3.0.0.beta1
>            Reporter: Vitali Yemialyanchyk
>            Assignee: Anton Klimkovich
>             Fix For: 3.0.0.cr1
>
>
> OneToOne relation is much more constrained than ManyToOne. 
> So if there is no back reference - it is more likely this is ManyToOne relation.
> In the case of back reference  existence - ManyToOne will always be a safe bet,
> so in this ambiguous case ManyToOne seems is a better choice - 
> but this is thing for discussion - there are some questions here.
> + may be we should add some comments into sources.

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