[Rails] Validate the start time (datetime type) and end time

Implementation details

Set the start time and end time on the bulletin board and create a site to recruit people. Set validation so that the end time does not come before the start time. (* In addition, add validation that the start time does not come before the current date and time)

environment

Ruby 2.5.0 Rails 6.0.3.4

Premise

When creating a recruitment board, set it so that you can enter the start time and end time.

Actual code

This time, the recruitment version is called board. The contents of the table are as ↓

XXXX_create_boards.rb

class CreateBoards < ActiveRecord::Migration[6.0]
  def change
    create_table :boards do |t|
(Omitted)
      t.datetime :start_time, null: false
      t.datetime :finish_time, null: false
      
      t.timestamps
    end
  end
end

Set the start time in the "start_time" column and the end time in the "finish_time" column.

• The end time could have been "end_time", but every time I entered "end", the indent changed (probably the editor setting), which was annoying, so I set it to "finish_time".

model

I have set the following validations.

• Some excerpts

models/board.rb

  validates :start_time, presence: true
  validates :finish_time, presence: true
  validate :start_finish_check
  validate :start_check

  def start_finish_check
    errors.add(:finish_time, "Please select a time later than the start time") if self.start_time > self.finish_time
  end

  def start_check
    errors.add(:start_time, "Please select a time later than the current date and time") if self.start_time < Time.now
  end

I will briefly explain each of them.

models/board.rb

  validate :start_finish_check
  validate :start_check

Here, we are verifying each process. Notice that it is validate instead of validates. If it is validate, you will get the error" You need to supply at least one validation ".

  def start_finish_check
    errors.add(:finish_time, "Please select a time later than the start time") if self.start_time > self.finish_time
　#Comparison of start time and end time with ↑
  end

  def start_check
    errors.add(:start_time, "Please select a time later than the current date and time") if self.start_time < Time.now
　#↑ to compare the start time and the current date and time
  end

Here we are comparing each time. If ʻifis true, an error statement will be added. It is not necessary to write it, but it is also possible to write the direction of the inequality sign> or rewrite ʻif as ʻunless. Also, the same process is performed without writing self`. That area is your choice.

Get time

This time it was a comparison of Datetime type, but I think that it can be implemented in the same way for other types. ↓ is a reference article for getting the date and time Get the current date and time with ruby [Differences between Time, Date, DateTime, TimeWithZone between Ruby and Rails] (https://qiita.com/jnchito/items/cae89ee43c30f5d6fa2c)

Reference article

How to validate datetime type input before and after with rails [Validation] rails How to specify after today's date