cheatsheets/rails-helpers.md

title: Rails helpers

Date helpers

http://api.rubyonrails.org/classes/ActionView/Helpers/DateHelper.html

Date

distance_of_time_in_words(Time.now, project.end_date) #=> 3 hours
distance_of_time_in_words_to_now project.end_date     #=> 3 hours

Time select

# Creates a time select tag that, when POSTed, will be stored in the article
# variable in the sunrise attribute.
time_select "article", "start_time"

# All options are optional
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

# For dates (all options are optional)
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' }

Time tag

time_tag Date.today  #=> <time datetime="2010-11-04">November 04, 2010<%rtime>
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<%rtime>
time_tag Date.today, :pubdate => true  #=> <time datetime="2010-11-04" pubdate="pubdate">November 04, 2010</time>

Forms

Forms

= form_for @post do |f|

Fields

f.check_box :enabled
f.text_field :title
f.text_area :body, \
  :size => '60x12'

Select dropdowns

f.time_zone_select :time_zone
f.date_select :birthday

f.select :city_id, [['Lisbon',1], ['Madrid',2], ...], 4   # (4 = selected)

f.collection_select :city_id, City.all, :id, :name

options_for_select [['Lisbon',1], ['Madrid', 2], ...], 4  # Just makes <option> tags

The rest

f.submit "Create"

Files

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