Column 超過 10 個請注意
場景
#TODO
Virtual Attribute
用 getter / setter 造出 virtual attribute
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| <%= f.text_field :full_name %>
def full_name
[first_name, last_name].join(' ')
end
def full_name=(name)
split = name.split(' ', 2)
self.first_name = split.first
self.last_name = split.last
end
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Serialize
把小資料存在同一個 column 內
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| class User < ActiveRecord::Base
serialize :preferences
end
user = User.create(:preferences => { "background" => "black","display" => large })
User.find(user.id).preferences # => { "background" => "black","display" => large }
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