[validator] Validating nested beans?

[Kevin Kokal <kk...@integral7.com>]

I'm using commons-validator to validate beans (not forms). In reading 
the "TODO" list for the project,
it sounds like this is the direction the project is heading. One 
consideration, though, is that beans
tend to have other beans nested within themselves, whereas forms just 
have fields. Has anyone had
any success getting nested validations to work? A simple scenario may 
illustrate my point:

Classes A, B, and C are all beans. Classes A and B both contain C, and 
both have getC() methods.
I want to set up validation rules for class C, and I want those 
validations run whenever I validate A and B,
too.

One solution is to use the dot-notation in the property name:

<form name="A">
    <field property="c.x"  depends="required"/>
    <field property="c.y"  depends="required"/>
    <...other "A" validations...>
</form>

<form name="B">
    <field property="c.x"  depends="required"/>
    <field property="c.y"  depends="required"/>
    <...other "B" validations...>
</form>

But this doesn't nicely lend itself to code reuse, because I have to 
repeat my "C" validations
everywhere. I'm thinking that something like this may be better:

<form name="A">
    <field property="c"  nested="C"/>
    <...other "A" validations...>
</form>

<form name="B">
    <field property="c"  nested="C"/>
    <...other "B" validations...>
</form>

<form name="C">
    <field property="x"  depends="required"/>
    <field property="y"  depends="required"/>
</form>

This is obviously a longer-term solution, requiring changes to the 
commons-validator core. Has anyone
instead tried doing something similar using a validator method?



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Re: [validator] Validating nested beans?

[David Graham <gr...@yahoo.com>]

The nested attribute is an interesting idea.  Changes were recently
checked in that added an extends attribute but I haven't had a chance to
look at how they might be related (if at all).

Anything we can do to simplify validation configuration is a good thing. 
Feel free to open a bugzilla enhancement ticket for this topic.

David

--- Kevin Kokal <kk...@integral7.com> wrote:
> I'm using commons-validator to validate beans (not forms). In reading 
> the "TODO" list for the project,
> it sounds like this is the direction the project is heading. One 
> consideration, though, is that beans
> tend to have other beans nested within themselves, whereas forms just 
> have fields. Has anyone had
> any success getting nested validations to work? A simple scenario may 
> illustrate my point:
> 
> Classes A, B, and C are all beans. Classes A and B both contain C, and 
> both have getC() methods.
> I want to set up validation rules for class C, and I want those 
> validations run whenever I validate A and B,
> too.
> 
> One solution is to use the dot-notation in the property name:
> 
> <form name="A">
>     <field property="c.x"  depends="required"/>
>     <field property="c.y"  depends="required"/>
>     <...other "A" validations...>
> </form>
> 
> <form name="B">
>     <field property="c.x"  depends="required"/>
>     <field property="c.y"  depends="required"/>
>     <...other "B" validations...>
> </form>
> 
> But this doesn't nicely lend itself to code reuse, because I have to 
> repeat my "C" validations
> everywhere. I'm thinking that something like this may be better:
> 
> <form name="A">
>     <field property="c"  nested="C"/>
>     <...other "A" validations...>
> </form>
> 
> <form name="B">
>     <field property="c"  nested="C"/>
>     <...other "B" validations...>
> </form>
> 
> <form name="C">
>     <field property="x"  depends="required"/>
>     <field property="y"  depends="required"/>
> </form>
> 
> This is obviously a longer-term solution, requiring changes to the 
> commons-validator core. Has anyone
> instead tried doing something similar using a validator method?
> 
> 
> 
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> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
> 


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