[RUBY] [Validation] rails How to specify after today's date

【goal】

When entering a date, you can only enter dates after today Validate

【merit】

■ Improvement of UX ■ Improved understanding of validate

【Development environment】

■ Mac OS catalina ■ Ruby on Rails (5.2.4.2) ■ Virtual Box:6.1 ■ Vagrant: 2.2.7

【Implementation】

Create validate with any method name
Added method processing ① Judge whether it is empty by "return if start_day.blank?" ② Get today's date with "if start_day <Date.today" & conditional branch & comparison ③ Define the error statement in "errors.add"

`model/item.rb`





validate :date_before_start
validate :date_before_finish



  def date_before_start
    return if start_day.blank?
    errors.add(:start_day, "Please select the one after today") if start_day < Date.today
  end

  def date_before_finish
    return if finish_day.blank? || start_day.blank?
    errors.add(:finish_day, "Please select the one after the start date") if finish_day < start_day
  end

that's all! !!

[I want to read it together]

■ Differences between Time, Date, DateTime, TimeWithZone between Ruby and Rails https://qiita.com/jnchito/items/cae89ee43c30f5d6fa2c

■ [ERROR message display] A simplified version that can be used at any time with the rails partial template. https://qiita.com/tanaka-yu3/items/63b189d3f15653cae263

■ [Date.today] How to retrieve information only for today rails https://qiita.com/tanaka-yu3/items/741711bd743b80eda51a

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