logger.tagged('Your Tag') { logger.info('Message') }

config/application.rb

# config/application.rb
config.log_tags = [:method_on_request_object, lambda { |request| request.method.modifier_method }]

config/application.rb

# config/application.rb
config.log_tags = [ :request_id, lambda { |request| "#{request.headers['HTTP_X_OS']} #{request.headers['HTTP_X_OS_VERSION']}" } ]

1. Introduction to Log Tags

2. Configuring Rails Components

3. Customizing Log Tags

4. Log Tagging Examples

5. Best Practices for Log Tags

# app/models/user.rb
has_one :four_car_garage
has_many :cars
validates :cars, length: { maximum: 4 }

In terminal

vim todo.txt

Colon (:) (lowercase) q vim :q

Just don't use MacVim @joe :D

1. Install latest version of Vim
2. Open a file in Vim
3. ⌘-Q and close the terminal
4. Reopen terminal

This is obviously a joke, it's impossible to quit Vim.

When you want to write destructive migrations please use if_exists: true when you’re trying to remove a table and check for a table existence when you want to add or remove a column ActiveRecord::Base.connection.table_exists?

Case 1:

def up
  drop_table :kittens, if_exists: true
end

Case 2:

def up
  return unless ActiveRecord::Base.connection.table_exists?(:kittens)
  add_column :kittens, :kind, :integer
end

Open term (or equivalent) and paste the following one-liner:

defaults write com.apple.dock persistent-apps -array-add '{tile-data={}; tile-type="spacer-tile";}'; killall Dock

When the Dock restarts, there should be a draggable blank space that you can move anywhere. Repeat to your heart's desire.

$ curl -X POST -H 'Content-type: application/json' --data '{"text": "Something important"}'  https://hooks.slack.com/services/YOUR/TOKENIZED/URL

Setting Up Incoming Webhooks

1. Log in to your Slack account and navigate to the Slack API main page.
2. Click the “Create an app” button and select “From scratch.”
3. Enter a name for your app and select the workspace where you want to deploy it.
4. Click the “Create App” button.
5. In the app settings, navigate to the “Features” section and click on “Incoming Webhooks.”
6. Toggle the switch to enable incoming webhooks.
7. Click the “Add New Webhook to Workspace” button.
8. Select the channel where you want to post messages and click “Allow.”

Creating a Payload

1. Determine the content type of your payload. For incoming webhooks, the content type is always “application/json.”
2. Create a JSON object that contains the message text and any additional options you want to include. For example:

   1. { "text": "Hello, Slack!", "username": "WebhookBot", "icon_emoji": ":ghost:" }
      

3. Use a tool like curl to send the payload to the incoming webhook URL.

Sending Messages with cURL

1. Open a terminal and navigate to the directory where you want to send the message
2. Create a file with a .json extension that contains the payload. For example, create a file named message.json with the following content:

   1. { "text": "Hello, World!" }
      

3. Use the cURL command to send the payload to the incoming webhook URL: 

   1. curl -X POST -H 'Content-Type: application/json' --data @message.json https://hooks.slack.com/services/YOUR/TOKENIZED/URL
      

Testing and Troubleshooting

• HTTP 400 Bad Request: The payload is malformed or missing required fields.
• HTTP 403 Forbidden: The incoming webhook URL is invalid or no longer available.
• HTTP 404 Not Found: The channel or workspace does not exist.
  
  

Advanced Slack Integration

• Web API: The Slack Web API allows you to send and receive messages, create custom bots, and more.
• Events API: The Slack Events API allows you to receive real-time updates on events such as messages, reactions, and more.
• Botkit: Botkit is a framework for building custom bots on Slack.

If you want to override previously set order (even through default_scope), use reorder() instead.

E.g.

User.order('id ASC').reorder('name DESC')

would ignore ordering by id completely

Ever wanted to display the structure of the current directory except or two directories?

#NPM or yarn project
tree -I node_modules

# Elixir Mix project
tree -I 'deps|test'

An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once

For example:

• "restful" = "fluster"
• "funeral" = "real fun"
• "adultery" = "true lady"
• "customers" = "store scum"
• "forty five" = "over fifty"

Create a new project using mix new anagram then let's write some test cases:

defmodule AnagramTest do
  use ExUnit.Case

  test "calculates anagram" do
    assert Anagram.anagram?("restful", "fluster") == true
    assert Anagram.anagram?("funeral", "realfun") == true
    assert Anagram.anagram?("adultery", "truelady") == true
    assert Anagram.anagram?("customers", "storescum") == true
    assert Anagram.anagram?("fortyfive", "overfifty") == true
    assert Anagram.anagram?("fiftyfive", "overfifty") == false
    assert Anagram.anagram?("funeral", "real fun") == false
  end
end

Now we have to write the code:

defmodule Anagram do
    def anagram?(a, b) do
    charlist(a) == charlist(b)
  end

  def charlist(w) do
    w |> String.trim() |> String.downcase() |> String.graphemes() |> Enum.sort()
  end
end

Run the tests mix test:

Compiling 1 file (.ex)
Generated anagram app
.

Finished in 0.1 seconds
1 test, 0 failures

Randomized with seed 752850

Done, now you have an anagram calculator!