validation of fields in a form in scala with lift frame work -

i working lift framework , scala. have form sign application, , want validate fields in it. have snippet access form values, , 1 validation class wrote validation functions. following code i've tried far. in snippet:

if(validationclassobject.validatename(first_name)){   if(validationclassobject.validatename(last_name)){     if(validationclassobject.validateemail(email)){       if(validationclassobject.validateusername(name)){          // adding values db         s.redirectto("/")        }       else{         s.notice("invalid user name")       }                    }     else{       s.notice("invalid mail id")                      }   }   else{     s.notice("invalid last name")   }            } else{   s.notice("invalid first name") } 

in validationclass wrote validation code looks like:

//function validating mail address  def validateemail(email: string): boolean =      """(\w+)@([\w\.]+)""".r.unapplyseq(email).isdefined  //code validating remaining fileds above 

this working, know not best way of coding operation in scala. how modify code in more scalable way? how can use case classes here?

you do:

  def av[t,v](validationfunction: => boolean, error: => t)(f: => v)={     if(!validationfunction) error      else f   }   def v[v](validationfunction: => boolean, error: => string)(f: => v)=av(validationfunction,s.notice(error))(f)     import validationcalssobject._    v(validatename(last_name),"invalid last name"){v(validatename(name),"invalid user name"){...}} 

av abstract method t , v result types error function , continue function f. v more specific function expects string error , encapsulates notice() call. give f part in curly braces v(validation, errormsg){/*todo when there no problem*/}.