Adds the given class symbol or string to the hash in the :class key. This will add a html class if there are already any existing or create the key and add this as the first class

@hash[:class] #=> nil
@hash.add_html_class!(:selected) #=> @hash[:class] == "selected"

@hash.add_html_class!("class1 class2") #=> @hash[:class] == "selected class1 class2"

Source Code

# File merb/core_ext/hash.rb, line 152
def add_html_class!(html_class)
  if self[:class]
    self[:class] = "#{self[:class]} #{html_class}"
  else
    self[:class] = html_class.to_s
  end
end