[Ruby on Rails] 5 idioms I always forget

Posted on 2017-08-24 , Tags:

Ruby on Rails is the great web application framework. I usually use it in the current job. But I always forget some idioms. In this post, I try to write out them.

1. Calling helper methods in Model methods

Idiom

ApplicationController.helpers.(helper name)

Example

class Post < ApplicationRecord
  def title_asterisk
    ApplicationController.helpers.with_asterisk(title)
  end
end

2. Calling routing helper methods in Model methods

Idiom

Rails.application.routes.url_helpers.(routing helper name)

Example

class Post < ApplicationRecord
  def new_or_edit_path
    if persisted?
      Rails.application.routes.url_helpers.new_post_path
    else
      Rails.application.routes.url_helpers.post_path(self)
    end
  end
end

3. Updating Model’s attributes without saving it to Database

Idiom

model.assign_attributes(attributes)

Example

class PostController < ApplicationController
  def update
    post = Post.find(params[])
    post.assign_attributes(post_params)
    post.save! if post.valid?
    redirect_to posts_path
  end
end

4. Turning off updating updated_at when saving Models

Idiom

ActiveRecord::Base.record_timestamps = false

Example

class PostImageUpdater
  def execute
    ActiveRecord::Base.record_timestamps = false
    Post.all.find_each do |post|
      post.image = get_updated_image(post)
    end
    ActiveRecord::Base.record_timestamps = true
  end
end

5. Basic Auth

Idiom

authenticate_or_request_with_http_basic(realm = "Application", &login_procedure)

Example

class WithBasicAuthController < ApplicationController
  before_action 

  def basic_auth
    authenticate_or_request_with_http_basic("Application") do |name, password|
      name == ENV['BASIC_AUTH_NAME'] && password == ENV['BASIC_AUTH_PASSWORD']
    end
  end
end

And More…

Maybe there are more idioms I always googling them. If anyone who have a good idea to remember them, please tell me :)