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class Notifier < ActionMailer::Base
  delivers_from '[email protected]'
  
  def welcome(user)
    @user = user # available to the view
    mail(:subject => 'Welcome!', :to => user.email_address)
    # auto renders both welcome.text.erb and welcome.html.erb
  end
  
  def goodbye(user)

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# MODEL

class Case < ActiveRecord::Base
  include Eventable
  
  has_many :tasks

  concerning :Assignment do
    def assign_to(new_owner:, details:)
      transaction do

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import Foundation

enum Environment: String {
    case development, staging, production
}

extension Environment {
    static var current: Environment {
        if isAppStore {
            return .production

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import * as React from "react";
import { useMousePosition } from "~/hooks/useMousePosition";

/** Component to cover the area between the mouse cursor and the sub-menu, to allow moving cursor to lower parts of sub-menu without the sub-menu disappearing. */
export function MouseSafeArea(props: { parentRef: React.RefObject<HTMLDivElement> }) {
  const { x = 0, y = 0, height: h = 0, width: w = 0 } = props.parentRef.current?.getBoundingClientRect() || {};
  const [mouseX, mouseY] = useMousePosition();
  const positions = { x, y, h, w, mouseX, mouseY };
  return (
    <div

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import { Controller } from "stimulus";
import { get } from "@rails/request.js";
import { PageSnapshot } from "@hotwired/turbo";

export default class extends Controller {
  static values = { hoverTime: Number };
  connect() {
    this.element.addEventListener("mouseover", this.prefetch.bind(this));
    this.element.addEventListener("touchstart", this.prefetch.bind(this));
  }

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class Ticket < ActiveRecord::Base
  belongs_to :grouper
  belongs_to :user

  validate :user_cant_be_blacklisted, on: :confirmation
  validate :user_cant_double_book, on: :confirmation

  validate :grouper_cant_be_full, on: :confirmation
  validate :grouper_cant_have_occurred, on: :confirmation

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/*
  ERB template chunk from The Feed's display of emails:

  <section class="postings postings--feed-style" id="postings"
      data-controller="pagination" data-pagination-root-margin-value="40px">
    <%= render partial: "postings/snippet", collection: @page.records, as: :posting, cached: true %>

    <%= link_to(spinner_tag, url_for(page: @page.next_param),
          class: "pagination-link", data: { pagination_target: "nextPageLink", preload: @page.first? }) unless @page.last? %>
  </section>

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Trix.config.textAttributes.red = { 
  style: { backgroundColor: "red" }
}

element.editor.activateAttribute("red")

// See available attribute options in:
// https://github.com/basecamp/trix/blob/master/src/trix/config/text_attributes.coffee
// https://github.com/basecamp/trix/blob/master/src/trix/config/block_attributes.coffee

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Implementing rich-text mentions with Action Text

1. Mix ActionText::Attachable into your mentionable person model:

   class Person < ApplicationRecord
     include ActionText::Attachable
   
     # ...

end

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http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")