Module: Truncates

Defined in:
lib/truncates.rb,
lib/truncates/version.rb

Constant Summary collapse

DEFAULT_MAX_LENGTH = 
255
DEFAULT_CHARACTER_TRAIL = 
""
DEFAULT_ON = 
:before_validation
VERSION = 
"0.0.3"

Instance Method Summary collapse

Instance Method Details

#truncates(field_name, options = {}) ⇒ Object 



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# File 'lib/truncates.rb', line 8

def truncates(field_name, options = {})
  raise("Hash expected, got #{options.class.name}") if !options.is_a?(Hash) && !options.empty?
  max_length = options[:max_length] || DEFAULT_MAX_LENGTH
  character_trail = options[:character_trail] || DEFAULT_CHARACTER_TRAIL    
  on = options[:on] || DEFAULT_ON
      
  case on.to_s
  when "validation"
    before_validation do       
      value = eval("self.#{field_name}")      
      
      if(value.present? && value.length > max_length)
        new_value = value.slice(0, max_length - character_trail.length) + character_trail        
        eval("self.#{field_name}=\"#{new_value}\"")
      end
    end
  when "set"
    method = 
    "def #{field_name}=(value)" +
    "  if(value.present? && value.length > max_length)" +
    "    new_value = value.slice(0, max_length - character_trail.length) + character_trail" +                  
    "  end" +
    "  \n" +
    "  super(new_value)" +
    "end"
          
    eval(method.to_s)
  end
end