scala - Lift: how make these relations polymorphic? -

i got entry should related 1 of 3 "lists" call them lista listb listc couldnt figure out how longmappedmapper. how this?

i wanted let list have multiple entries without having specify listx relation each kind of list. not:

class entry ...{     object lista extends longmappedmapper(this,lista)     object listb extends longmappedmapper(this,listb)     ... } 

i want like:

class entry ...{     object list extends polylongmappedmapper(this,lista,listb,listc)     //polylongmappedmapper example mapper want     ... } 

or:

class entry ...{     object list extends polylongmappedmapper(this,baselisttrait)     //where baselisttrait trait shared list classes     //polylongmappedmapper example mapper want     ... } 

is somewere in lift framework what want? comparable polylongmappedmapper? or there elegant way solve problem?

you can in such way:

class extends longkeyedmapper[a] idpk {     object entry extends longmappedmapper(this, entry)     ...  class b extends longkeyedmapper[b] idpk {     object entry extends longmappedmapper(this, entry)     ...  class c extends longkeyedmapper[c] idpk {     object entry extends longmappedmapper(this, entry)     ...  class entry extends longkeyedmapper[entry] idpk {     def alist = a.findall(by(a.entry, this))     def blist = b.findall(by(b.entry, this))     def clist = c.findall(by(c.entry, this))     ... 

and lista are:

e.alist, e.blist, e.clist 

when:

val e: entry 

etam.