[jira] [Reopened] (CAY-1813) Missing ObjEntity Attribute Validation with Duplicate DbEntity Columns

["Michael Gentry (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CAY-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Gentry reopened CAY-1813:
---------------------------------


Fix throws an NPE when using Embeddables.
                
> Missing ObjEntity Attribute Validation with Duplicate DbEntity Columns
> ----------------------------------------------------------------------
>
>                 Key: CAY-1813
>                 URL: https://issues.apache.org/jira/browse/CAY-1813
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Modeler
>            Reporter: Michael Gentry
>            Assignee: Michael Gentry
>             Fix For: 3.0.3, 3.1B3, 3.2M1
>
>
> If you have two ObjEntity attributes mapped to the same DbEntity column, this should produce a validation warning.
> Real world example (from <obj-entity> tag):
>   <obj-attribute name="addressFrom" type="java.lang.String" db-attribute-path="DRIVER_ID"/>
>   <obj-attribute name="driverId" type="java.math.BigInteger" db-attribute-path="DRIVER_ID"/>
> In this example, addressFrom was mistakenly mapped to the DRIVER_ID column with no validation warning.  DRIVER_ID is a foreign key.
> At runtime, trying to fault to the driver using getDriver(), this SQL was produced:
> SELECT ... WHERE t0.ID = ? [bind: 1->ID:'1'] (note the quotes)
> The Cayenne runtime found the first mistakenly-mapped DRIVER_ID and used it, which happened to be a String, causing the SQL to be incorrectly produced and the fault to fail.
> This was difficult to track down.  A validation check to make sure the DB columns aren't mapped more than once would be helpful to eliminate errors.

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