Rename an existing entity

[b...@soliduslink.com]

Hi,

Is there a recommended way to rename an existing entity in the datastore?

Thanks a lot!

Best,
Baojun

[Jeff Schnitzer]

What does that mean ‘rename an existing entity’?

If you mean change the id of an entity… you create a new one with the same data and delete the old.

Jeff

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[Baojun Xu]

For example if I want change the name of all my Manager entities in the DS to Employee? How would I do it?

On Wed, May 23, 2018 at 12:08 AM, Jeff Schnitzer <je...@infohazard.org> wrote:

What does that mean ‘rename an existing entity’?

If you mean change the id of an entity… you create a new one with the same data and delete the old.

Jeff

On Tue, May 22, 2018 at 7:17 AM, <b...@soliduslink.com> wrote:

Hi,

Is there a recommended way to rename an existing entity in the datastore?

Thanks a lot!

Best,
Baojun

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Baojun Xu

Tel: +41 79 791 78 99

SolidusLink AG

Rütistrasse 16

8952 Schlieren

[Jeff Schnitzer]

OH you want to change the *kind* of an entity?

That’s pretty painful. If you have a lot of data, my advice would be to rename your Java class from Manager to Employee and add @Entity(name=“Manager”). In other words, leave the data in the datastore as-is and map it to a more sanely named class.

Otherwise you have to create all new entities, delete all the old entities, and update any foreign key references.

There is no equivalent of ALTER TABLE in the datastore.

Jeff

On Tue, May 22, 2018 at 3:12 PM, Baojun Xu <b...@soliduslink.com> wrote:

For example if I want change the name of all my Manager entities in the DS to Employee? How would I do it?

On Wed, May 23, 2018 at 12:08 AM, Jeff Schnitzer <je...@infohazard.org> wrote:

What does that mean ‘rename an existing entity’?

If you mean change the id of an entity… you create a new one with the same data and delete the old.

Jeff

On Tue, May 22, 2018 at 7:17 AM, <b...@soliduslink.com> wrote:

Hi,

Is there a recommended way to rename an existing entity in the datastore?

Thanks a lot!

Best,
Baojun

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Baojun Xu

Tel: +41 79 791 78 99

SolidusLink AG

Rütistrasse 16

8952 Schlieren

[Baojun Xu]

OK great! That confirms what I thought. I guess I will write a script to do the migration. Thanks.