Flattened relationships are those that span more than one
DbRelationship. You don't have them in the mapping below, but you used
to have them in the mapping that you posted here before...
Anyway, I took your mapping and successfully generated classes with all
normal "set/add/remove" methods... So back to my initial advise - make
sure that you are generating classes from the DataMap below and not
some old copy.
Andrus
On Apr 27, 2005, at 6:44 PM, Filip Balas wrote:
> Hi Andrus,
>
> Here is what I'm working with:
>
> <obj-relationship name="children" source="Location" target="Location"
> deleteRule="Cascade" db-relationship-path="rel_children"/>
>
> <obj-relationship name="parent" source="Location" target="Location"
> db-relationship-path="rel_parent"/>
>
> <db-relationship name="rel_children" source="IMV_locations"
> target="IMV_locations" toMany="true">
> <db-attribute-pair source="id" target="parent_id"/>
> </db-relationship>
>
> <db-relationship name="rel_parent" source="IMV_locations"
> target="IMV_locations" toDependentPK="true" toMany="false">
> <db-attribute-pair source="parent_id" target="id"/>
> </db-relationship>
>
> <obj-entity name="Location"
> className="com.imvprojects.phoneList.data.Location"
> dbEntityName="IMV_locations">
> <obj-attribute name="_description" type="java.lang.String"
> db-attribute-path="description"/>
> </obj-entity>
>
> <db-entity name="IMV_locations" schema="dbo" catalog="GPSForecast">
> <db-attribute name="description" type="VARCHAR" length="75"/>
> <db-attribute name="id" type="INTEGER" isPrimaryKey="true"
> isMandatory="true" isGenerated="true" length="10"/>
> <db-attribute name="parent_id" type="INTEGER" length="10"/>
> </db-entity>
>
> I'm not sure what you mean by flattened relationships?
> Do you mean the fact that I am using only one table to
> represent the relationship? Should I be breaking this out?
> I have another relationship where I have a 1:n relationship
> which I have represented in a seperate table (for reasons
> which are not relevent to the discussion) and this class
> has all of the appropriate accessors.
>
> Thanks,
> Filip
>
>
>
> On 4/27/05, Andrus Adamchik <andru..bjectstyle.org> wrote:
>> Doublecheck that you cleared those bogus flattened relationships.
>>
>> Read-only relationships are usually generated for all flattened
>> relationships that Cayenne treats are non-updateable (i.e. all except
>> m:n
>> with a single join table). I suspect this is the cause of the problem.
>>
>> Andrus
>>
>>
>>> I didn't notice this before but it appears cayenne
>>> did not generate modifiers for the hierarchical class?
>>>
>>> What I mean is this:
>>>
>>> I HAVE:
>>> Location getParent()
>>> List getChildren();
>>>
>>> I am MISSING:
>>> setParent(Location)
>>> addToChildren(Location)
>>> removeFromChildren(Location)
>>>
>>> I have checked to make sure I didn't inadvertantly
>>> make the entity read-only. Any suggestions?
>>>
>>> Thanks,
>>> Filip
>>>
>>>
>>> On 4/25/05, Filip Balas <fbala..mail.com> wrote:
>>>> Just a quick update so that no one wastes anymore
>>>> time on this other than me. It appears that with the
>>>> clean test, cayenne handles everything just fine.
>>>>
>>>> There must be something else in how I've used the
>>>> modeler or set up the relationships in the database
>>>> that is causing this to happen.
>>>>
>>>> Thanks for your input Andrus, just know that there is
>>>> a test case for this was motivation enough to prove
>>>> myself wrong.
>>>>
>>>> Cheers,
>>>> Filip
>>>>
>>>>
>>>> On 4/25/05, Filip Balas <fbala..mail.com> wrote:
>>>>> Hmmm, okay I don't like to blame someone else's code
>>>>> unless I'm 100% sure. Later today I will set up a purely
>>>>> clean test (seperate table, seperate map, sperate test class). If
>>>> this doesn't work I'll submit a bug...
>>>>>
>>>>> Thanks again,
>>>>> Filip
>>>>>
>>>>> On 4/25/05, Andrus Adamchik <andru..bjectstyle.org> wrote:
>>>>>> I am still dubious that this is Cayenne problem as we have test
>>>> cases that cover this situation. So I recommend doublechecking
>>>> that you don't have your old incorrect DataMap sitting somewhere
>>>> in the classpath, and also check if it works with Cayenne 1.1.1
>>>> (unless your code depends heavily on 1.2 API making this
>>>> impossible).
>>>>>>
>>>>>> If it still doesn't work, please submit a bug report containing
>>>> DataMap XML file and a code snippet that trigers this fetch.
>>>>>>
>>>>>> Andrus
>>>>>>
>>>>>>
>>>>>>> I'm on the bleeding edge (could be why I'm having the
>>>>>>> problem) cayenne 1.2M3.
>>>>>>>
>>>>>>> Filip
>>>>>>>
>>>>>>>
>>>>>>> On 4/25/05, Andrus Adamchik <andru..bjectstyle.org> wrote:
>>>>>>>> You shouldn't have to do anything special. Cayenne (including
>>>> the Modeler) works fine with simple parent-child hierarchies.
>>>> For "children" I expect the generated query to look even
>>>> simpler:
>>>>>>>>
>>>>>>>> SELECT t0.description, t0.id, t0.parent_id
>>>>>>>> FROM dbo.IMV_locations t0, dbo.IMV_locations t1
>>>>>>>> WHERE t0.parent_id = ? [bind: 1]
>>>>>>>>
>>>>>>>> So ... What version of Cayenne do you have? There was a bug
>>>> long time ago that messed it up, but I am fairly sure it is
>>>> fixed in 1.1 final and 1.1.1 releases.
>>>>>>>>
>>>>>>>> Andrus
>>>>>>>>
>>>>>>>>
>>>>>>>>> Hi Andrus,
>>>>>>>>>
>>>>>>>>> Yes that makes perfect sense. I didn't catch that error, I
>>>> just
>>>>>>>> assumed the modeler would generate the right xml when
>>>>>>>>> I selected the proper source and target.
>>>>>>>>>
>>>>>>>>> However, even when I corrected the xml manually to your
>>>> suggestion, I still have the following statement generated by
>>>> cayenne:
>>>>>>>>>
>>>>>>>>> SELECT t0.description, t0.id, t0.parent_id
>>>>>>>>> FROM dbo.IMV_locations t0, dbo.IMV_locations t1
>>>>>>>>> WHERE t0.parent_id = t1.id AND (t1.parent_id = ?) [bind: 1]
>>>>>>>>>
>>>>>>>>> I need it to read:
>>>>>>>>>
>>>>>>>>> SELECT t0.description, t0.id, t0.parent_id
>>>>>>>>> FROM dbo.IMV_locations t0, dbo.IMV_locations t1
>>>>>>>>> WHERE t0.parent_id = t1.id AND (t1.id = ?) [bind: 1]
>>>>>>>>>
>>>>>>>>> In another spot in my code I have a hierarchy set up but it
>>>> is a many to many (map, not tree) and cayenne seems
>>>>>>>>> to deal with that beautifully. To achieve this I have an
>>>>>>>> intermediate table that maps locations to one another. Will I
>>>> have to add
>>>>>>>>> this extra table with a one-To-one constraint to ensure a
>>>> tree
>>>>>>>> structure and not a map?
>>>>>>>>>
>>>>>>>>> Thanks to all who have answered.
>>>>>>>>> Your help is greatly appreciated.
>>>>>>>>> Filip
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 4/24/05, Andrus Adamchik <andru..bjectstyle.org> wrote:
>>>>>>>>>> Hi Filip,
>>>>>>>>>>
>>>>>>>>>>> <obj-relationship name="children" source="Location"
>>>>>>>>>> target="Location" deleteRule="Cascade"
>>>>>>>>>>> db-relationship-path="rel_children.rel_children"/>
>>>>>>>>>>>
>>>>>>>>>>> <obj-relationship name="parent" source="Location"
>>>>>>>> target="Location"
>>>>>>>>>> db-relationship-path="rel_parent.rel_parent"/>
>>>>>>>>>>
>>>>>>>>>> The way relationships above are mapped you'll be getting
>>>>>>>> GRANDchildren and GRANDparents. Is this really what you want?
>>>> The query you quote seems correct (for grandchildren). What I
>>>> mean is that
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>> SELECT t0.description, t0.id, t0.parent_id
>>>>>>>>>>> FROM dbo.IMV_locations t0, dbo.IMV_locations t1
>>>>>>>>>>> WHERE t0.parent_id = t1.id AND (t1.parent_id = ?) [bind:
>>>> 1]
>>>>>>>>>>
>>>>>>>>>> is a short form for
>>>>>>>>>>
>>>>>>>>>> SELECT t0.description, t0.id, t0.parent_id
>>>>>>>>>> FROM dbo.IMV_locations t0, dbo.IMV_locations t1,
>>>> dbo.IMV_locations
>>>>>>>> t2 WHERE t0.parent_id = t1.id AND t1.parent_id = t2.id AND
>>>> t2.id > > > >> ? [bind: 1]
>>>>>>>>>>
>>>>>>>>>> (see an extra join)... If you need direct children, then you
>>>> need
>>>>>>>> to remove the last component in the obj-relationship path. The
>>>> resulting mapping should look like this:
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> <obj-relationship name="children" source="Location"
>>>>>>>> target="Location" deleteRule="Cascade"
>>>>>>>>>> db-relationship-path="rel_children"/>
>>>>>>>>>>
>>>>>>>>>> <obj-relationship name="parent" source="Location"
>>>> target="Location"
>>>>>>>> db-relationship-path="rel_parent"/>
>>>>>>>>>>
>>>>>>>>>> I hope I understood your requirements correctly...
>>>>>>>>>>
>>>>>>>>>> Andrus
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Cell : 403.461.7895
>>>>>>>>> Work: 403.770.1534
>>>>>>>>> MSN: fbala..otmail.com
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Cell : 403.461.7895
>>>>>>> Work: 403.770.1534
>>>>>>> MSN: fbala..otmail.com
>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> Cell : 403.461.7895
>>>>> Work: 403.770.1534
>>>>> MSN: fbala..otmail.com
>>>>>
>>>>
>>>> --
>>>> Cell : 403.461.7895
>>>> Work: 403.770.1534
>>>> MSN: fbala..otmail.com
>>>>
>>>
>>>
>>> --
>>> Cell : 403.461.7895
>>> Work: 403.770.1534
>>> MSN: fbala..otmail.com
>>
>>
>
>
> --
> Cell : 403.461.7895
> Work: 403.770.1534
> MSN: fbala..otmail.com
>
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