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https://issues.apache.org/cayenne/browse/CAY-1000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Menard reassigned CAY-1000:
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Assignee: Kevin Menard (was: Andrus Adamchik)
> Duplicate items in list.
> ------------------------
>
> Key: CAY-1000
> URL: https://issues.apache.org/cayenne/browse/CAY-1000
> Project: Cayenne
> Issue Type: Bug
> Components: Cayenne Core Library
> Affects Versions: 1.2 [STABLE], 2.0 [STABLE], 3.0
> Reporter: Kevin Menard
> Assignee: Kevin Menard
>
> According to the documentation on relationships
> (http://cayenne.apache.org/doc/relationships.html):
> "Considering that Cayenne Lists are internally managed as ordered Sets, and
> are not allowed to contain the same object more than once, you may want to
> avoid modeling relationships as Sets at all, unless the object public
> interface requirements warrant that."
> However, it is fairly trivial to show that a relationship mapped as a List
> can hold a duplicate. For example, the following test will fail:
> public void testDuplicateAdd() {
> Artist artist = (Artist) ctxt.newObject("Artist");
> artist.setArtistName("a name");
> assertTrue(artist.getPaintingArray().isEmpty());
> // Add a single painting to the artist.
> Painting painting = (Painting) ctxt.newObject("Painting");
> painting.setPaintingTitle("a painting");
> artist.addToPaintingArray(painting);
> assertEquals(1, artist.getPaintingArray().size());
> // Now add the exact same painting. Cayenne should detect the
> duplicate and not actually add it.
> artist.addToPaintingArray(painting);
> assertEquals(1, artist.getPaintingArray().size());
> }
> The last assertion fails because the array size will actually be 2.
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