dynamic.rb

user.phone_1 = '963112233'
user.phone_4 = '666111000'
user.phone_2 = '678111000'

phones = (1..4).map do |i|
  user.send("phone_#{i}")
end

=> ['963112233', '678111000', nil, '666111000']

VALID_SECTIONS = %w(banca bolsa fondos)

def filter_by_section(param_section)
  return unless param_section.in?(VALID_SECTIONS)
  Message.send("in_#{param_section}") 
end

tagging.tag_id = 1234
tagging.taggable_type = 'Post'
tagging.taggable_id = 56

Class Tagging
  def taggable
    taggable_type.constantize.find(taggable_id)
  end
end

tagging.taggable
 => Post.find(56)

def pictures(format, order = 'created_at desc', limit = nil)
  "Look for *.#{format} files in order #{order} maximum #{limit || 'all'}"
end
  
  
item.pictures('jpg')
item.pictures('jpg', 'likes_count desc')
item.pictures('jpg', 'created_at desc', 20)
  
def pictures(format:, order: 'created_at desc', limit: nil)
  "Look for *.#{format} files in order #{order} maximum #{limit || 'all'}"
end
  
item.pictures(format: 'jpg')
item.pictures(format: 'jpg', order: 'likes_count desc')
item.pictures(format: 'jpg', limit: 20)