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When I invoke find() method on a model (MyModel.find(:all, :conditions => ‘…’)), I do not have to pass a database connection as a parameter.
How does this work? What technique does Rails use to make this possible? Does it use dependency injection?
The database connection is defined in database.yml. During startup – Rails passes the connection to ActiveRecord::Base. As all the models are inheriting from ActiveRecord::Base they become ‘aware’ of what connection to use.
Take a look at http://api.rubyonrails.org/classes/ActiveRecord/Base.html