Class: ActiveRecord::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/activerecord/utils.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.alias_attr(new, old) ⇒ Object 



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# File 'lib/activerecord/utils.rb', line 61

def self.alias_attr( new, old )
  alias_attr_reader( new, old )
  alias_attr_writer( new, old )
end

.alias_attr_reader(new, old) ⇒ Object

todo: add opts={} e.g. lets us add, for example, depreciated: true ??

- will issue a warning



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# File 'lib/activerecord/utils.rb', line 46

def self.alias_attr_reader( new, old )
  define_method( new ) do
    send( old )
    ### use read_attribute( old ) instead? why? why not??
    #  see http://www.davidverhasselt.com/2011/06/28/5-ways-to-set-attributes-in-activerecord/
  end
  ## todo: check for boolean values - add new? version too ??
end

.alias_attr_writer(new, old) ⇒ Object 



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# File 'lib/activerecord/utils.rb', line 55

def self.alias_attr_writer( new, old )
  define_method( "#{new}=" ) do |value|
    send( "#{old}=", value )
  end
end

.attr_reader_w_fallbacks(*keys) ⇒ Object 



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# File 'lib/activerecord/utils.rb', line 80

def self.attr_reader_w_fallbacks( *keys )
  define_method( keys[0] ) do
    read_attribute_w_fallbacks( keys )
  end
end

.rnd ⇒ Object 



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# File 'lib/activerecord/utils.rb', line 107

def self.rnd
  ## works w/ sqlite3 and postgresql
  ##  - check if it works w/ mysql/mariadb too ? suppots offset and limit in SQL?

  ## todo: use ::rand  -- and lets add an self.rand alias too ??
  ##  check if ::rand call works
  rnd_offset = rand( self.count ) ## NB: call "global" std lib rand

  self.offset( rnd_offset ).limit( 1 ).first
end

Instance Method Details

#read_attribute_w_fallbacks(*keys) ⇒ Object 



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# File 'lib/activerecord/utils.rb', line 86

def read_attribute_w_fallbacks( *keys )
  ### todo: use a different name e.g.:
  ## read_attribute_cascade ?? - does anything like this exists already?
  ## why? why not?
  keys.each do |key|
    value = read_attribute( key )
    return value unless value.nil?
  end
  value # fallthrough? return latest value (will be nil) --or return just nil - why? why not??
end