Created
March 6, 2013 23:35
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test delle transazioni in Rails
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# Ho creato una app rails semplice, con un modello User e uno Order. | |
# User: | |
class User < ActiveRecord::Base | |
attr_accessible :name, :surname | |
has_many :orders | |
end | |
#Order: | |
class Order < ActiveRecord::Base | |
attr_accessible :description, :number, :user_id | |
belongs_to :user | |
end | |
# poi ho eseguito questo: | |
puts User.count | |
puts Order.count | |
User.transaction do | |
u = User.create(name:"paolo") | |
o1 = Order.create(number: 493943) | |
o2 = nil.create(number: 1234) # errore, qui dovrebbe fare il rollback! | |
end | |
puts User.count | |
puts Order.count | |
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Ulteriore dettaglio importante per la nostra situazione di db legacy è che le tabelle devono essere innodb (la maggior parte delle nostre sono myisam).