Class: Tetrahedron::Database

Inherits:
Service
  • Object
show all
Defined in:
lib/tetrahedron/database.rb

Defined Under Namespace

Classes: Configuration, Provider

Constant Summary

Constants inherited from Service

Service::AlreadyConfigured, Service::Misconfigured, Service::Unconfigured, Service::Unreachable

Class Method Summary collapse

Methods inherited from Service

configure, configured!, configured?, wait_until_reachable, wait_until_reachable!

Class Method Details

.connect ⇒ Object 



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# File 'lib/tetrahedron/database.rb', line 30

def self.connect
  configured!
  connected = self.class_variable_get(:@@provider).connect
  self.connection.loggers << Logger.new($stdout) if connected
  # Back our models with the new connection.
  model = self.class_variable_get(:@@application).const_get("Model")
  model.db = self.connection if connected
  connected
end

.connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tetrahedron/database.rb', line 21

def self.connected?
  !self.connection.nil?
end

.connection ⇒ Object 



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# File 'lib/tetrahedron/database.rb', line 25

def self.connection
  configured!
  self.class_variable_get(:@@provider).connection
end

.disconnect ⇒ Object 



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# File 'lib/tetrahedron/database.rb', line 40

def self.disconnect
  configured!
  # TODO(mtwilliams): Verify that this is thread-safe.
  model = self.class_variable_get(:@@application).const_get("Model")
  model.db = Sequel.mock
  self.class_variable_get(:@@provider).disconnect
end

.install(application) ⇒ Object 



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# File 'lib/tetrahedron/database.rb', line 52

def self.install(application)
  super(application)

  # TODO(mtwilliams): Refactor out this horrid mess.

  # We can't build an inheritence heirarchy.
  # See https://groups.google.com/d/msg/sequel-talk/OG5ti9JAJIE/p1iqO57cwqwJ.
  application.class_eval("Model = Class.new(Sequel::Model);")
  model = application.const_get("Model")

  # Stop Sequel from bitching when we users subclass models before the
  # database connection is established.
  model.db = Sequel.mock

  # Back descendents.
  model.send :define_singleton_method, :db= do |db|
    super(db)
    # All the way down, boys.
    self.descendents.each do |descendent|
      descendent.db = db
    end
  end

  # Custom names are cool, m'kay.
  application.send :define_singleton_method, :Model do |source|
    anonymous_model_class = model::ANONYMOUS_MODEL_CLASSES_MUTEX.synchronize do
                              model::ANONYMOUS_MODEL_CLASSES[source]
                            end
    unless anonymous_model_class
      anonymous_model_class = if source.is_a?(Sequel::Database)
                                Class.new(model).db = source
                              else
                                Class.new(model).set_dataset(source)
                              end
      model::ANONYMOUS_MODEL_CLASSES_MUTEX.synchronize do
        model::ANONYMOUS_MODEL_CLASSES[source] = anonymous_model_class
      end
    end
    anonymous_model_class
  end
end

.migrate(migrations) ⇒ Object 



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# File 'lib/tetrahedron/database.rb', line 48

def self.migrate(migrations)
  Sequel::IntegerMigrator.run(self.connection, migrations)
end