Simplified link_to

<%= link_to project %>

# model
def to_s
  name
end

def to_s = name

present? vs exists? vs any?

# Rails Console

Project.find(1).present?
Project.exists?(id: 1)
Project.where(id: 1).any?

Specific layouts

# Terminal
rails g controller admin/welcomes show

# app/views/layouts/admin/welcomes.html.erb
<content>

HEREDOC

# view
<%= some_svg(800, 150) %>

# helper
def some_svg(width=150, height=150)
  <<-HEREDOC.html_safe
    <svg width="#{width}" height="#{height}" xmlns="http://www.w3.org/2000/svg">
      <rect width="#{width}" height="#{height}" x="0" y="0" style="fill:blue;stroke:pink;stroke-width:5;opacity:0.5" />
    </svg>
  HEREDOC
end

Opening a gem

# Terminal
bundle open gem_name

Serve a static site

# Terminal
ruby -run -ehttpd -- --port 3000

code ~/.zshrc
source ~/.zshrc

serve 3000

# ~/.zshrc
serve () {
  ruby -run -ehttpd -- --port $1
}