I made a LINE bot with Rails + heroku

What I made

I thought it would be convenient if there was a BOT that would notify me of garbage disposal every morning. I made it after studying.

Language used

Ruby Ruby On Rails6 Heroku LINE Messager API

STEP 1 Create a LINE BOT that returns a message

I will omit this because other people have posted it in detail.

Reference article

https://qiita.com/y428_b/items/d2b1a376f5900aea30dc

https://qiita.com/natsukingdom-yamaguchi/items/e84dffdd90d7f5ef8224

STEP 2 PUSH message

Add a task and send a message at a fixed time.

Creating a task

$rails g task reminder_task

Then generate a controller

$rails g controller webhook trash

describe description and task

lib/tasks/reminder_task.rake

namespace :reminder_task do
  desc "Here is the subject of the task"
  task :trash => :environment do
    webhook = WebhookController.new
    puts webhook.trash
  end
end

Next, define the action of the webhook controller

app/controllers/webhook_controller.rb

  def trash
    puts "message"
  end

Check if it is added to the rake task here

＄ rake -T
rake reminder_task:trash task theme

If you can confirm that it has been added

＄ rake reminder_task:trash

OK when [Message] is sent

Setting environment variables

If you want to use PUSH messages, you have to set environment variables.

See below for environment variables. https://qiita.com/yuichir43705457/items/7cfcae6546876086b849 https://qiita.com/noraworld/items/bfa80811c9e30b4474af

Setting method

Add dotenv to gem

gem 'dotenv-rails'

Create an .env file in the root directory of your application directory (Created where there is an app or gemfile)

Set various LINE channels

/.env

LINE_CHANNEL_SECRET='xxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
LINE_CHANNEL_TOKEN='yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy'
LINE_USER_ID='zzzzzzzzzzzzzzzzzzzzzz'

Rewrite the trash action of the webhook controller

app/controller/webhook_controller.rb

class WebhookController < ApplicationController
  require 'line/bot'

def trash
  message = {
            "type": "text",
            "text": WebhookController.contents
           }
            client = Line::Bot::Client.new { |config|
              config.channel_secret = ENV["LINE_CHANNEL_SECRET"]
              config.channel_token = ENV["LINE_CHANNEL_TOKEN"]
           }
            response = client.push_message(ENV["LINE_USER_ID"], message)
  end

  def self.contents

      date = Date.today

      case date.strftime('%a')
        when "Mon"
            "Today is Monday, Burning Garbage Day!"
        when "Tue"
            "None!"
        when "Wed"
            "Today is Wednesday, the day of non-burnable garbage and cardboard"
        when "Thu"
            "Today is Thursday, a normal garbage day!"
        when "Fri"
            "Today is Friday, the day of cans, bottles and PET bottles!"
        when "Sat"
            "Tired for a week! None today!"
        else
            ""
        end
    end
  end

Push to Heroku and set up a scheduler and you should get a message.

Finally

The service you made for the first time after studying ruby? Therefore, it seems that there are many mistakes. In that case, I would be grateful if you could point out!

(Thanks to all the reference articles.)