poro-entry-form.rb

# app/forms/entry_form.rb
class EntryForm
 include ActiveModel::Model

 attr_accessor :distance, :time_period, :date_time,
               :status_weather, :status_landform

 validates_presence_of :distance, :time_period, :date_time

 validates_numericality_of :distance, :time_period

 validates :status_weather, inclusion: {
   in: EntryStatus::OPTIONS[:weather]
 }

 validates :status_landform, inclusion: {
   in: EntryStatus::OPTIONS[:landform]
 }
end