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AI Coding Agent Guide: Rails Best Practices

Compact guide for AI agents working on Rails applications. Focus on existing patterns, keep changes minimal, and preserve security/performance.

Core Principles

DO: Follow existing architecture (concerns, scopes, jobs, Turbo Streams, Stimulus). Keep diffs minimal. Optimize for clarity. Respect tests. Preserve security/performance.

DON'T: Introduce new frameworks. Mix refactors with behavior changes. Over-abstract. Bypass security checks. Log secrets.

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api_key = "API_KEY" # from https://dash.bunny.net/stream/128158/security
video_id = 'VIDEO_ID'
timestamp = 1.hour.from_now.to_i
token = OpenSSL::Digest::SHA256.hexdigest("#{api_key}#{video_id}#{timestamp}")

# URL
# https://iframe.mediadelivery.net/embed/[Video_Library_ID]/[VIDEO_ID]?token=[TOKEN]&expires=[timestamp]

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{
  "order_id": "String",
  "total_price": "String",
  "seller_id": "String",
  "notes": "String",
  "order_items": [
    {
      "item_id": "String",
      "unit_price": "String",
      "quantity": "Number",

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{
   "payload":{
      "first_name":"String",
      "last_name":"String",
      "email":"String",
      "phone":"String",
      "address":[
         {
            "city_name":"String",
            "state_name":"String",

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iabbrev myid adham90

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git filter-branch -f --msg-filter '
        if [ "$GIT_COMMIT" = "ddbe6b0d2561566aa91733c98cce086bdd50bdd5" ];
        then
                echo new message;
        else
                cat
        fi' HEAD

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

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#Arch Linux installation guide

1. See what disk structure there is: $ lsblk
2. Format boot partition: $ mkfs.ext4 /dev/sda<root> or use btrfs 😮

$ mkfs.btrfs -L "Arch" /dev/sda1
$ mount /dev/sda1 /mnt

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# include this in application controller
module Authentication
  protected
    # Inclusion hook to make #current_user and #signed_in?
    # available as ActionView helper methods.
    def self.included(base)
      base.send :helper_method, :current_user, :signed_in?, :authorized? if base.respond_to? :helper_method
    end
    
    # Returns true or false if the user is signed in.

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SPC s c remove highlight

**** Files manipulations key bindings
Files manipulation commands (start with ~f~):

| Key Binding | Description                                                    |
|-------------+----------------------------------------------------------------|
| ~SPC f c~   | copy current file to a different location                      |
| ~SPC f C d~ | convert file from unix to dos encoding                         |
| ~SPC f C u~ | convert file from dos to unix encoding                         |