rspec - Rails - Call a method from within a string -


i trying call method i've defined within string, passed parameter method, so:

existing_size = self.exchange_rates.where("? < date_valid", :time).size

the method is:

  def date_valid     date = date.today     if(time.now.hour >= hour)       date += 1.day     end     date   end

however, error:

activerecord::statementinvalid:        pg::undefinedcolumn: error:  column "date_valid" not exist        line 1: ...xchange_rates"."prediction_id" = $1 , ('time' < date_valid...

it seems though have time attribute , date_valid method swapped in where call. of course assuming time is, in fact, column in exchange_rates table. following should work you.

existing_size = self.exchange_rates.where("time < ?", date_valid).count

i've used count instead of size because count calculation in database, while size in memory on returned exchanged_rates relation.


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