RAILS Simple form

gistfile1.rb

f.error_messages
f.input :username
f.button :submit

f.input :username, label: 'Your username please'
f.input :password, hint: 'No special characters.'
f.input :email, placeholder: '[email protected]'
f.input :remember_me, inline_label: 'Yes, remember me'

f.input :username, label_html: { class: 'my_class' }
f.input :password, hint: false, error_html: { id: 'password_error'}

f.input :password, input_html: { maxlength: 20 }
f.input :remember_me, input_html: { value: '1' }

f.input :description, as: :text
f.input :accepts, as: :radio_buttons
f.input :age, collection: 18..60

f.input :username, disabled: true, hint: 'You cannot change your username.'

f.input :age, collection: 18..60, prompt: "Select your age"
f.input :country_id, collection: @continents, as: :grouped_select, group_method: :countries

#Associations
f.association :company #belongs_to :company
f.association :roles #has_and_belongs_to_many :roles
#Associations as..
f.association :company, as: :radio_buttons
f.association :roles,   as: :check_boxes

#Collection Radio Buttons
f.collection_radio_buttons :options, [[true, 'Yes'] ,[false, 'No']], :first, :last

#Collection Check Boxes
f.collection_check_boxes :options, [[true, 'Yes'] ,[false, 'No']], :first, :last

#Custom inputs
# app/inputs/currency_input.rb
class CurrencyInput < SimpleForm::Inputs::Base
  def input
    "$ #{@builder.text_field(attribute_name, input_html_options)}".html_safe
  end
end
f.input :money, as: :currency