finders with nullable arguments

[BzOne]

Hi All

is there a way to generate finders that accept a null able arguments for example
findFooByBarEqualsAndTarNotEquals(String bar, String Tar) returns all Foos that have bar == "test" when call
findFooByBarEqualsAndTarNotEquals("test" , null);
instead of throwing IllegalArgumentException

[Stefan Schmidt]

BzOne,

I am not quite sure I understand your use case but you can check for attributes that are null by using finders which use 'IsNull'

So in your case that would look like so:



findFooByBarEqualsAndTarIsNull(String bar)


That should return all Foos which have the specified bar (that equals to "test" for example) and where Tar is null.

Cheers,
Stefan

[BzOne]

Hi Stefan

actually this is not what I meant the following use case may make it clear

I need a search form has 2 inputs bar and Tar and searches for Foo
if I entered Bar only it will show Foos with bar = form bar value
and if I entered Tar it well show Foos with tar = form tar value
and if I entered both bar and tar it well return Foos with bar and tar = form bar and tar values

my problem is the finder
findFooByBarEqualsAndTarEquals(String bar, String tar)
wont allow null parameter

i've work around by using 3 finders


findFooByBarEquals(String bar)
findFooByTarEquals(String tar)
findFooByBarEqualsAndTarEquals(String bar, String tar)

and the controller choose between them depending on the received form parameter

but things got messy with forms that have 3 or more search parameters
and I still need to create the form and controller method myself