attempt_2.rb

class ExampleController < ApplicationController
  def action_1
    res_1; return if performed?
    # rest of the logic....
    render json: {data: '...'}, status: 200
  end

  def action_2
    res_1; return if performed?
    # rest of the logic....
    render json: {data: '...'}, status: 200
  end

  def action_3
    res_2; return if performed?
    # rest of the logic....
    render json: {data: '...'}, status: 200
  end

  def action_4
    res_2; return if performed?
    # rest of the logic....
    render json: {data: '...'}, status: 200
  end
  
  private
  
  def res_1
    # perform some operations
    render json: {message: 'Failed'}, status: 400 unless operation1_successful?
  end
  
  def res_2
    # perform some operations
    render json: {message: 'Failed'}, status: 400 unless operation1_successful?
  end
end