[xwiki-users] How to trigger an event or method on page delete?
I have implemented a xwiki based application in which there are two main classes "A" and "B". Those classes have a one-to-many relationship where one "A" can be associated with many "B"s. (Just like presented in https://www.xwiki.org/xwiki/bin/view/FAQ/HowToCreateAOneToManyRelationshipIn... ) The main thing is that when I delete a page which contains and represents an "A" object, associated with many "B"s, those "B" pages still contain the reference to the no longer present "A" object. Therefore, I was hopping to find some kind of "onDelete" event triggered when a page is deleted so I could clean those dead references. Just to clarify: "B" objects have an attribute called "A-reference" where the doc.fullName of an "A" page is stored. If I could trigger a method when this "A" object is deleted I would be able to perform an HQL query in order to list those pages associated with the deleted "A" page and set a null value to the "A-reference" attribute. Would appreciate any thoughts and hints on how to solve this because I'm out of ideas and found no documentation on such event/trigger/method. Thanks! Francisco Barretto
See http://extensions.xwiki.org/xwiki/bin/view/Extension/Observation+Module+Loca.... The event you want to listen to is org.xwiki.bridge.event.DocumentDeletedEvent. On Wed, Mar 22, 2017 at 5:55 PM, Francisco Barretto <[email protected]> wrote:
I have implemented a xwiki based application in which there are two main classes "A" and "B". Those classes have a one-to-many relationship where one "A" can be associated with many "B"s. (Just like presented in https://www.xwiki.org/xwiki/bin/view/FAQ/HowToCreateAOneToManyRelationshipIn... )
The main thing is that when I delete a page which contains and represents an "A" object, associated with many "B"s, those "B" pages still contain the reference to the no longer present "A" object. Therefore, I was hopping to find some kind of "onDelete" event triggered when a page is deleted so I could clean those dead references.
Just to clarify: "B" objects have an attribute called "A-reference" where the doc.fullName of an "A" page is stored. If I could trigger a method when this "A" object is deleted I would be able to perform an HQL query in order to list those pages associated with the deleted "A" page and set a null value to the "A-reference" attribute.
Would appreciate any thoughts and hints on how to solve this because I'm out of ideas and found no documentation on such event/trigger/method.
Thanks!
Francisco Barretto
-- Thomas Mortagne
Thank you Thomas, I'll try it! Francisco Barretto Laboratório de Arte e Tecnologia - LATE! www.late.art.br Laboratório de Pesquisa em Arte Computacional (Midialab) Universidade de Brasília - UnB 2017-03-22 14:02 GMT-03:00 Thomas Mortagne <[email protected]>:
See http://extensions.xwiki.org/xwiki/bin/view/Extension/ Observation+Module+Local.
The event you want to listen to is org.xwiki.bridge.event. DocumentDeletedEvent.
On Wed, Mar 22, 2017 at 5:55 PM, Francisco Barretto <[email protected]> wrote:
I have implemented a xwiki based application in which there are two main classes "A" and "B". Those classes have a one-to-many relationship where one "A" can be associated with many "B"s. (Just like presented in https://www.xwiki.org/xwiki/bin/view/FAQ/HowToCreateAOneToManyRelations hipInXWiki )
The main thing is that when I delete a page which contains and represents an "A" object, associated with many "B"s, those "B" pages still contain the reference to the no longer present "A" object. Therefore, I was hopping to find some kind of "onDelete" event triggered when a page is deleted so I could clean those dead references.
Just to clarify: "B" objects have an attribute called "A-reference" where the doc.fullName of an "A" page is stored. If I could trigger a method when this "A" object is deleted I would be able to perform an HQL query in order to list those pages associated with the deleted "A" page and set a null value to the "A-reference" attribute.
Would appreciate any thoughts and hints on how to solve this because I'm out of ideas and found no documentation on such event/trigger/method.
Thanks!
Francisco Barretto
-- Thomas Mortagne
participants (2)
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Francisco Barretto -
Thomas Mortagne