scala - Play framework- design suggestion for validation -


i need validate if newly added entity, part of model has been added. addition happen taking input user. believe standard way add constraints in form along lines of 

.verifying( "already exists", <code check if entity exists> )

this lead globalerror entity exists. error message static "already exists". i'm looking for, though, tell user possible matches exist, globalerror incapable of doing.

should want not adding validator , allowing binding succeed? way, when 

myform.fold{ entity returned success => <success code>, erroneousform =>  <failure code>}

i can take success branch , check there if entity duplicate? if similarities exist can redirect user? feel shouldn't controller's job, , of design logic inside controller, should technically lie inside model itself. , model should tell controller wrong , 'type of w can first create new element , upon finding potential rongness' , controller can take appropriate action. shouldn't have contain code determine if there wrong.

can please suggest should way it?


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