Hi there,
I'm pretty new in RoR. I have to deal with 2 different objects from the model, and to do some updates on them... How can I work in an transactional scope? I mean, if second fails, the first rolls back.
Where do I have to put this code? In the controller, in the model, or is there any kind of service layer?
Thanks
Broadly speaking, this is a business decision so it belongs where the BL resides -- in the model layer. Depending on how your models are related, some of that may be taken care of for you through the association proxies. For example, if Header has_many :details (Detail belongs_to :header) then...
... @header = Header.new( ... ) @detail = @header.details.build( ... ) @header.save
The @header.save above will create the header and detail records wrapped in a DB connection.
If you want more explicit control over the transaction then you can use the #transaction method of the ActiveRecord (model) objects.
Header.transaction do header.update_attributes( ... ) detail.update_attributes( ... ) end
For more info check the Rails API here: http://api.rubyonrails.org/classes/ActiveRecord/Transactions/ClassMethods.html#M001115