Re: Entity dependence analisys
Re: Entity dependence analisys
- Subject: Re: Entity dependence analisys
- From: Chuck Hill <email@hidden>
- Date: Fri, 29 Aug 2008 13:50:11 -0700
See ERXEntityFKConstraintOrder and ERXEntityDependencyOrderingDelegate
in Wonder.
The next step on that one is to order rows based on FK usage to handle
reflexive relationships.
Chuck
On Aug 29, 2008, at 1:44 PM, Florijan Stamenkovic wrote:
Hi all,
I made a little something to analyze dependencies between entities,
and sort entities based on them. So that the non-dependent entities
are at a lower index in the resulting list then the ones they are
dependent on. The current implementation only deals with
relationships, but the analysis method is agnostic of dependency
types. To add your own dependencies check out the comment at line
127. It should work with any kind of a dependency constraint.
Usage:
Put into whichever app, and call the static sortedEntities() method.
The returned value should be a list of entities in which the non-
dependent entities are at a lower index in the resulting list then
the ones they are dependent on. The entities are loaded from the
default model group. If there is a circular dependency, an exception
should be thrown.
It is not very well commented, and totally not optimized, as I am
still working on it. I also hope to be able to fine-grain it a bit.
Till now the only fine graining is the possibility to define non-
mandatory dependencies, the _isDependent(...) method will use that
flag.
Let me know if it works for you or not. I tested it with a fairly
complex model (around 15 entities, 50+ relationships) successfully.
It should be able to chew through anything though. I'd really
appreciate if somebody with a really super-complex model group could
give it a go.
F
<DependencyAnalizer.java>
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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