slick - Scala Play Forms: using HLists to get around the 22 fields limitation -


slick uses kind of hack hlists manage tables have more 22 columns, instance (auto-generated) row model constructor:

type samplesrow = hcons[int,hcons[string,hcons[option[string],hcons[int,hcons[string,hcons[int,hcons[int,hcons[option[int],hcons[option[float],hcons[option[float],hcons[option[string],hcons[option[string],hcons[boolean,hcons[option[string],hcons[option[string],hcons[option[string],hcons[option[string],hcons[option[string],hcons[option[int],hcons[option[float],hcons[option[float],hcons[option[float],hcons[option[string],hcons[option[string],hnil]]]]]]]]]]]]]]]]]]]]]]]]  def samplesrow(id: int, name: string, shortname: option[string] = none, sampletypeid: int, receiveddate: string, projectid: int, taxoid: int, quantifmethodid: option[int] = none, concentration: option[float] = none, volume: option[float] = none, description: option[string] = none, comment: option[string] = none, istrashed: boolean = false, commentcustomer: option[string] = none, createdat: option[string] = none, updatedat: option[string] = none, createdby: option[string] = none, updatedby: option[string] = none, poid: option[int] = none, `260280ratio`: option[float] = none, `260230ratio`: option[float] = none, rin: option[float] = none, concupdatedat: option[string] = none, concupdatedby: option[string] = none): samplesrow = {   id :: name :: shortname :: sampletypeid :: receiveddate :: projectid :: taxoid :: quantifmethodid :: concentration :: volume :: description :: comment :: istrashed :: commentcustomer :: createdat :: updatedat :: createdby :: updatedby :: poid :: `260280ratio` :: `260230ratio` :: rin :: concupdatedat :: concupdatedby :: hnil }

can use same trick have form hold 24 values? in 

val tableform: form[samplesrow] = form(   mapping(     id -> ignored(-1),     name -> text,     short_name -> optional(text),     sample_type_id -> number,     received_date -> default(text, now),     project_id -> number,     taxo_id -> number,     quantif_method_id -> optional(number),     concentration -> optional(of[float]),     volume -> optional(of[float]),     description -> optional(text),     comment -> optional(text),     is_trashed -> default(boolean, false),     comment_customer -> optional(text),     created_at -> optional(text),     updated_at -> optional(text),     created_by -> optional(text),     updated_by -> optional(text),     po_id -> optional(number),     ratio_260_280 -> optional(of[float]),     ratio_260_230 -> optional(of[float]),     rin -> optional(of[float]),     conc_updated_at -> optional(text),     conc_updated_by -> optional(text)   )(samplesrow)(???) )

i feel constructor def samplesrow above can used apply method, can use "unapply" ?

i know supposed use nested mappings, cannot map result directly slick row model , sounds silly write 100 lines of code implement conversion can insert.

i tempted rid of forms , replace them custom jsobject parsing:

// controller action: val content = request.body.asjson val row = rowfromjson(content)  // somewhere else import play.api.libs.json._ def rowfromjson(j: jsobject): samplesrow = {   samplesrow(     (j \ "id").as[int],     (j \ "name").as[string]     ...   ) }

where samplesrow slick samples#tableelementtype table samples <: abstracttable[_].


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