Rails - Helpercheatsheet

RUBY
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distance_of_time_in_words(Time.now, project.end_date)
distance_of_time_in_words_to_now(project.end_date)
time_ago_in_words 3.minutes.ago

RUBY
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number_to_currency 20.33
number_to_currency 20.33, precision: 0
number_with_precision 3.14159, precision: 2
number_to_percentage 32       #=> "32%"
number_with_delimiter 2048    #=> "2,048"
number_to_human 12000000      #=> "12 million"
number_to_human_size 12000000 #=> "12 MB"
number_to_phone "5551234"     #=> "555-1234"

ERB
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<% cache project do %>
<% cache [project, current_user] do %>
<% cache_if admin?, project do %>
<% cache_unless admin?, project do %>

RUBY
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tag("br")
tag("img", src: "image.jpg")
content_tag(:p, "Hello")

RUBY
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# 时间
time_select "article", "start_time"
time_select "article", "start_time", \
  include_seconds: true,
  minute_step: 15,
  prompt: true,
  prompt: { hour: "Choose hr", minute: "Choose min", second: "Choose sec" },
  ampm: true
# 日期
date_select "article", "written_on", \
  start_year: 1995,
  use_month_numbers: true,
  discard_day: true,
  include_blank: true,
  order: [:day, :month, :year],
  default: 3.days.from_now,
  default: { day: 20 },
  prompt: { day: 'Select day', month: 'Select month', year: 'Select year' }

RUBY
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time_tag Date.today
# => '<time datetime="2010-11-04">November 04, 2010</time>'
time_tag Time.now
# => '<time datetime="2010-11-04T17:55:45+01:00">November 04, 2010 17:55</time>'
time_tag Date.yesterday, 'Yesterday'
# => '<time datetime="2010-11-03">Yesterday</time>'
time_tag Date.today, pubdate: true
# => '<time datetime="2010-11-04" pubdate="pubdate">November 04, 2010</time>'
time_tag Date.today, format: :short_date # (en.time.formats.short_date)

RUBY
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= form_for @post, multipart: true do |f|
= f.file_field :picture

RUBY
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t('folders')
t('folders.save')
l(Time.now)
t('x_files', count: files.count)
# files:
#    one: 'one file'
#    other: '%{count} files'