Rails validation - maximum database entries -


i have rails project, using active record , wondering if there validation helper max number of individual entries. example, if had form submission , wanted, 2, , wanted first 2 persisted table, how this?

i have read manual , had @ numericality etc it's not i'm looking for. have tried write own validation method in model, assuming there validation helper makes easier:

  def validatepassengernumber      if self.passengers.length > 2       # unsure on how refuse new data access database     end   end

add error base after check return true, , prohibit save database. 

 def validate_passenger_number              self.errors.add(:base, "exceed maximum entry") if self.passengers.length > 2  end

call custom validation in respective model.

  validate :validate_passenger_number, on: :create

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