[hibernate-dev] [OGM] Element collections stored embedded in entity

[Gunnar Morling]

2014-03-12 14:48 GMT+01:00 Emmanuel Bernard <emmanuel at hibernate.org>:

> There are two problems,
>
> I am not sure why it uses "nicknames" as the property name, I don't think
> that's the actual default value in JPA, is it?
>

Default value in which way?


> Otherwise, I agree with you, we could simplify it except when the
> collection is keyed or indexed. At this stage you need to store the key or
> the index next to the value.
>

Yes, sure. This is about a simple non-ordered collection (a Set in this
case).

>
> About collection&&element, the bug is already opened
> https://hibernate.atlassian.net/browse/OGM-251
> Hasn't been addressed yet :(
>

Ah, never noticed that one before. Just assigned it to me.

--Gunnar


>
> Emmanuel
>
>
> On 12 Mar 2014, at 10:21, Gunnar Morling wrote:
>
>  Hi,
>>
>> I just did some testing around @ElementCollection using MongoDB. A
>> collection of a basic type results in the following persistent format of
>> the embedding entity:
>>
>>   {
>>       "_id": "17457a47-abfc-4fb7-955e-17acb0b49808",
>>       "nicknames": [
>>           { "nicknames": "idrA" },
>>           { "nicknames": "day[9]" }
>>       ]
>>   }
>>
>> Is there any reason why we don't use this instead:
>>
>>   {
>>       "_id": "17457a47-abfc-4fb7-955e-17acb0b49808",
>>       "nicknames": [
>>           "idrA",
>>           "day[9]"
>>       ]
>>   }
>>
>> For non-basic, embeddable types it looks like this:
>>
>>   {
>>       "_id": "17457a47-abfc-4fb7-955e-17acb0b49808",
>>       "homeAddress": [
>>           {
>>               "homeAddress.collection&&element.city": "Paris",
>>               "homeAddress.collection&&element.country": "France",
>>               "homeAddress.collection&&element.street1": "1 avenue des
>> Champs Elysees",
>>               "homeAddress.collection&&element.street2": null,
>>               "postal_code": "75007"
>>           }
>>       ]
>>   }
>>
>> Is this "collection&&element" style intended, or could we use the simple
>> property name as keys here ("postal_code" is specified explicitly via
>> @Column)?
>>
>> I can file issues in JIRA (and take a look at some point), but wanted to
>> be
>> sure I'm not missing something here.
>>
>> Thanks,
>>
>> --Gunnar
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>