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From Andrus Adamchik <and...@objectstyle.org>
Subject Re: To-Many Warning?
Date Thu, 14 Nov 2013 07:47:34 GMT
> Should Cayenne Modeler give a warning when both sides are to-many
> (and not a flattened many-to-many)?

I think it should.

A.

On Nov 13, 2013, at 8:20 PM, Michael Gentry <mgentry@masslight.net> wrote:

> I just spent a couple hours debugging an issue where the model was messed
> up and the to-many checkbox (in the DbEntity editors) was set on both sides
> of a relationship and Cayenne was inserting NULLs for the FK and orphaning
> records.  Should Cayenne Modeler give a warning when both sides are to-many
> (and not a flattened many-to-many)?
> 
> Here is the XML for the issue (using 3.1B2, but the issue exists in 3.0.2
> also):
> 
> ~> cat cayenne-project.xml
> <?xml version="1.0" encoding="utf-8"?>
> <domain project-version="6">
> <map name="datamap"/>
> </domain>
> 
> 
> ~> cat datamap.map.xml
> <?xml version="1.0" encoding="utf-8"?>
> <data-map xmlns="http://cayenne.apache.org/schema/3.0/modelMap"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://cayenne.apache.org/schema/3.0/modelMap
> http://cayenne.apache.org/schema/3.0/modelMap.xsd"
> project-version="6">
> <db-entity name="child">
> <db-attribute name="parent_fk" type="BIGINT"/>
> <db-attribute name="pk" type="BIGINT" isPrimaryKey="true"
> isMandatory="true"/>
> </db-entity>
> <db-entity name="parent">
> <db-attribute name="pk" type="BIGINT" isPrimaryKey="true"
> isMandatory="true"/>
> </db-entity>
> <db-relationship name="to_parent" source="child" target="parent"
> toMany="true">
> <db-attribute-pair source="parent_fk" target="pk"/>
> </db-relationship>
> <db-relationship name="to_child" source="parent" target="child"
> toMany="true">
> <db-attribute-pair source="pk" target="parent_fk"/>
> </db-relationship>
> </data-map>
> 
> 
> Thanks,
> 
> mrg


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